Craft guide

Preparation before sizing

　　Compatibility and adhesion test

A. Before construction, the project contractor must use all the base materials formally used in the project that are in contact with the structural glue (generally including 2 pieces of glass [20cmx20cm], 2 pieces of aluminum-plastic panels [20cm x 20cm], and 4 pieces of aluminum [ 15cm length], double-sided tape, etc.) mail to our company, and write the project name, project area, construction unit, base material manufacturer, model number, specification, type of glue to be used, etc. in written form, and entrust our company The quality inspection department conducts compatibility and adhesion tests.

B. The company conducts a compatibility test according to the GB16776 national standard to determine the compatibility of the silicone structural adhesive with the substrate. After 7 days of testing, a simple compatibility report can be issued, and after 35 days of testing, a formal compatibility report can be issued. report.

　　The design, construction and installation process of all hidden frame and semi-hidden frame glass curtain wall projects using our company's structural adhesive must comply with the requirements of JGJ102 "Technical Specifications for Glass Curtain Wall Engineering).

　　The minimum width of the silicone structural adhesive is 7mm and the minimum width of the silicone structural adhesive is 6mm. The ratio of the width and the depth of the adhesive must be between 1:1 and 3:1.

　　 Basic requirements for construction

　　 Requirements for construction personnel

　　 The bonding of glass curtain wall units has certain requirements for construction operators, who should have the following conditions

　　A. Familiar with the construction procedures of silicone structural adhesive, master the construction operation technology and construction specifications of silicone structural sealant, and understand the conditions of bonding and sealing parts and supporting materials specified in the engineering drawings.

　　B. Have a high sense of responsibility and understand that the safety and reliability of glass curtain walls are closely related to the quality of construction.

　　C. Grasp the basic knowledge of the solution and technical safety after the bonding failure of the silicone structural sealant.

　　Requirements for construction technology environment and other conditions

　　A. Special tools must be used for the construction of silicone structural sealant. The construction environment should be well-lit, clean, well-ventilated, and have measures such as fire prevention, riot prevention and dust prevention.

　　B. The construction environment temperature of silicone structural sealant should not be lower than 15°C, nor higher than 27°C, and the relative humidity should not be lower than 50%.

　　C. Check the production date, certificate of conformity, inspection report, glue seam check calculation report, and compatibility test report of the silicone structural adhesive, and the product should meet the standards and curtain wall design requirements.

　　D. The injection thickness and width of the silicone structural adhesive should meet the design requirements, and the width should not be less than 7mm, and the thickness should not be less than 6mm.

　　 substrate surface cleaning

　　The cleaning of the surface of the adhered material plays a decisive role in the quality of the project. Therefore, strict surface cleaning is the key to ensuring the quality of the project.

　　 substrate surface cleaning

　　The cleaning of the surface of the adhered material plays a decisive role in the quality of the project. Therefore, strict surface cleaning is the key to ensuring the quality of the project. Cleaning materials For non-oily dust, dirt and frosting, etc., usually 50% isopropanol aqueous solution, isopropanol and alcohol, etc. can be used: for oily dirt and films, degreasing solvents such as toluene, Xylene or methyl ethyl ketone, etc., the cleaning cloth should be white clean, soft, singeing cotton cloth.

　　 double cloth wiping method

　　 Use the cleaning agent required in the compatibility report to soak a clean cloth to wipe the surface of the substrate, and wipe the adhered surface only in one direction.

　　 Before the cleaning agent evaporates, immediately wipe off the cleaning agent on the surface of the adherend with a second piece of dry and clean cloth, and do not allow the cleaning agent to dry on the surface of the substrate. The cloth piece is only used once and is not allowed to be reused to ensure that the cloth piece does not cause secondary pollution.

　　 The cleaning width should always be larger than the bonding and sealing construction width, generally about 1cm wide on both sides.

　　 When cleaning deep and narrow parts, you can use a clean cloth to wrap it around a suitable tool and wipe it according to the above procedure.

　　 Cleaning quality inspection, use a cloth soaked with detergent to wipe the surface to be adhered, and the cloth must be free of pollution.

　　The cleaned surface is not allowed to be touched again by hand or contaminate the surface again in any other way. After cleaning the surface that is not glued within one hour, it should be cleaned again before applying glue.

　　 When dipping in solvent during cleaning, pour the solvent from the container on a clean cloth instead of dipping the cloth in the container to prevent the solvent from being contaminated, and it is not allowed to be stuck on the surface.

　　 spray or brush the cleaning agent on the surface, causing the cleaning agent to overflow on the sticky surface, causing the oil to dissolve and spread to a larger area.

　　The operation site must have good ventilation, fire prevention and explosion-proof measures, and at the same time, it shall comply with the technical safety regulations for the use of organic solvents.

Cleaning the surface of porous materials

Porous stone such as granite or marble may not be effectively cleaned with solvents. According to the surface characteristics of porous materials, some need to be polished and cleaned, some need to be cleaned with solvent, and some have both. High-pressure water washing can also be effective. Of cleaning methods. Porous materials will absorb solvents, primers, etc. during the cleaning process. You must wait for them to evaporate completely before applying glue.

　　 Primer Liquid Application

For most substrates, the silicone sealant produced by Guangxi has a good bonding effect without using a primer. However, if the bonding test report indicates that the primer is to be used, it must be used in the actual construction. Use the primer provided or specified by our company.

　　Users should perform primer treatment after cleaning the substrate and before applying sealant. ,

　　Pour the primer on a clean non-linting cotton cloth, and apply a thin and even primer on the surface to be glued. Remember not to use too much primer.

　　The user should apply the glue within 3~5 minutes after the primer is dry, otherwise it will affect the bonding effect of the glue.

　　 Under normal circumstances, the drying time of the primer is about 10 minutes. If the time is too long, it may be due to excessive amount or failure.

　　 The primer liquid is similar to the cleaning liquid and has a certain degree of danger, so corresponding safety protection measures should be taken.

　　Scope of application

　　 is applicable to other sealant series products of Guangxi Company except for structural adhesives.

　　 adhesive spacer

　　 The sealant should be applied in a clean environment with a temperature of 4 ℃ ~ 40 ℃ and a relative humidity of 40% ~ -80%. It should not be applied when it is raining or snowing. Too low ambient temperature will reduce the adhesiveness of the sealant, because the surface wettability of the sealant is reduced, and frost or ice may form on the surface of the base at low temperatures, which affects the adhesiveness of the sealant. Therefore, the safe use temperature of the sealant should be greater than 5°C. High ambient temperature also has a negative effect on the sealant. On the surface of the building exposed to direct sunlight at too high ambient temperature, the actual temperature of the substrate surface may be much higher than the ambient temperature. Due to the influence of high temperature, the sag resistance of the sealant will deteriorate, the curing time will be accelerated, the construction and finishing time will be shortened, and air bubbles will be easily generated. Too low relative humidity will slow down the curing speed of the sealant. Too high relative humidity may form a film of condensed water on the surface of the substrate, affect the adhesion of the sealant and the substrate, and may also cause the sealant to form bubbles.

　　 Bonding spacers are used to prevent the sealant from contacting undesired surfaces or materials. This type of bonding will destroy the performance of the sealant. The materials that can be used as adhesive spacers are: polyethylene or polytetrafluoroethylene self-adhesive tape or the anti-adhesive material recommended by our company. Liquid bonding spacers are not recommended because they may contaminate the bonded surface during use. Bonded spacers are used on hard, non-deformable cushioning materials at the bottom of the seam to prevent the sealant from bonding to these materials, forming a harmful three-sided bond. The soft and easily deformable open-cell gasket material does not require bonding spacers because it does not significantly restrict the free movement of the sealant. Oil-impregnated materials, asphalt, unvulcanized polymers, and similar materials cannot be used as bonding spacers.

　　 Sealant width: The width of the sealant shall not be less than 2 times the thickness.

　　The depth of the sealant The depth of the sealant is related to the width of the sealant. When designing the joint width, full consideration should be given to the linear expansion coefficient of the building materials used, the construction season and the expected use limit temperature. For the depth of the sealant, the following values ​​are recommended: a The minimum width of the sealant is 6mm, and b The width of the sealant must be greater than the depth.

　　 Sealant application procedure

  General requirements:

　　 Silicone sealant should be applied at a temperature of 4 ℃ ~ 40 ℃, so that a better bonding effect can be obtained.

　　 Temporary protective tape can be attached to the area near the surface of the cleaned substrate to be adhered if necessary.

　　The squeezing action of the sealant should be carried out continuously, so that the glue can be squeezed out from the nozzle of the glue injection nozzle evenly and continuously in a cylindrical shape, and the diameter of the nozzle should be smaller than the thickness of the glue interface, so that the nozzle can enter one of the depths. The nozzle should be moved evenly and slowly to ensure that the connector is filled with sealant to prevent bubbles or cavities from moving too fast.

After the glue is injected, it should be modified immediately. The usual method is to use a tool to forcefully compress the excess sealant into the interface and smooth the surface, so that the glue is in full contact with the surface to be glued, and then peel off all the sealant. Temporary protective tape.

　　The sealant is not solidified within 48 hours after sizing, and the sealing joints are not allowed to have large displacement, otherwise it will affect the sealing effect.

　　One-component sealant construction procedure

　　 One-component sealant can be directly squeezed out of plastic or flexible packaging with a manual or pneumatic sizing gun, or a single-component glue machine can be used for construction.

　　 Two-component sealant construction procedure

　　 Two-component sealant must be constructed in strict accordance with the following procedures to ensure construction quality.

　　 Two-component sealant should be applied with a two-component glue dispenser, and manual compounding is not recommended.

"Measure the curing speed of the two-component sealant to determine the ratio between the base material and the curing agent.

　　 Sealant A/B component mixing uniformity determination butterfly test

　　 Squeeze 5~10 grams of the mixed glue from the glue maker into the middle of the paper, fold the paper to flatten the glue.

　　Open the paper and check the glue sample. The evenly mixed glue should have no heterochromatic stripes. If the glue has heterochromatic stripes, it means that the glue is not uniform. You should find the cause and use it after the problem is solved.

　　Some specific requirements for adhesion, compatibility and contamination tests 7

　　 Adhesion test Each test needs to use at least two pieces of glass or other plates with a size of 20cm x 20cm.

　　 Compatibility test: All auxiliary materials in contact with the sealant in the assembly design, such as double-sided tapes, foam sticks, etc., need to be tested for compatibility, and the length of each material used in the test is not less than 100mm.

　　 Pollution test Each test requires three pieces of tested material with a size of 250mm x 250mm.

　　 When sending samples, the application form for photon compatibility test of Wuhan University should be filled in and sent to our company together with the samples.

　　The usual test cycle is 35 days. For urgent test requirements, a simple test report can be issued 7 days after receiving the materials.

　　 user attention

　　 The information published in this article is what we believe to be reliable. Due to the wide range of actual conditions, we cannot have an overview of all the conditions, so we cannot guarantee the correctness and applicability of our products in certain usage and purposes. Before using the product, the user should understand the product in detail, and then determine the best method of use.

　　Injection procedure and finished product protection of silicone structural sealant

　　Before injecting glue, cover the extended horizontal surface of the area to be glued with protective tape to prevent contamination of these areas during glue application.

　　 One-component silicone structural sealant can be directly applied with manual or pneumatic glue gun, and two-component silicone structural sealant requires special glue-making equipment.

　　When using a pneumatic glue gun, the operating pressure should be adjusted to ensure that there is enough pressure to fill the entire glue joint with the silicone structural sealant.

　　The caliber of the glue nozzle should be smaller than the width of the interface, so that the muzzle penetrates one-half of the depth of the interface. The nozzle of the gun should be moved continuously and evenly to ensure that the structure is filled with structural glue. When the glue is injected, it should be prevented from moving too fast or reciprocating to generate bubbles or cavities.

After the glue injection is completed, before the surface of the structural glue is dry, the extra silicone structural glue outside of the joint 0 should be compacted in the joint 0 with a spatula, so that the silicone structural sealant is in contact with the side of the joint 0 to facilitate reduction Small internal bubbles and cavities, and ensure that the silicone structural sealant is in close contact with the surface to be adhered, and finally the interface surface is smoothed in one direction.

　　Do not use liquid auxiliary materials such as water, soapy water, alcohol and other organic solvents to help the squeegee. These materials will hinder the curing of the silicone structural adhesive and the formation of adhesion and cause appearance problems.

　　 After finishing, remove the protective tape before the silicone structural glue forms a crust. And immediately mark the date and number on the glass or aluminum frame of the unit plate, and place it horizontally for maintenance.

　　 Under standard conditions, the curing time of one-component silicone structural sealant is 21 days, and the curing time of two-component silicone structural sealant is 14 days. The single element must be cured for sufficient time under the condition of static and unstressed, so that the structural adhesive can produce sufficient bonding force, and the unit can be transported and installed after passing the rubber cutting inspection.

　　 Renewal and repair works construction,

During the construction process and after the completion of the construction, it may happen that it needs to be repaired or re-assembled, such as: the repair of the rubber tapping test unit, the damage of the glass surface caused by various situations, the failure of the curtain wall system such as the adhesion failure or Water leakage etc. Generally perform the following procedures:

　　Carefully record the 8th period and the specific circumstances and location of the failure, for a larger range of problems. The company and the design and construction unit should be contacted as soon as possible to reassess the entire system or part of it according to the specific situation. The next operation is strictly prohibited until the relevant department is notified to continue the construction.

　　Tap the rubber, leaving a thin layer (between 0.5 and 1mm) of sealant on the surface of the material.

　　Put the clean substrate in the correct position, install the temporary fixing fixture, and stick masking tape around the interface.

　　 After cutting the rubber strip, start construction immediately without surface cleaning. No primer is needed, and the new glue can bond well with the old glue.

　　 Inject fresh silicone structural sealant according to the prescribed construction steps. After the silicone structural sealant is fully cured, check the adhesion and remove the temporary fixture.

  General provisions

　　 It is recommended that all users who use the construction silicone sealant produced by Guangxi Co., Ltd. directly purchase it from our company or the agent designated by our company in order to obtain reliable products and receive strong technical assistance.

For special construction materials, new materials in the construction industry, surface coatings or materials with surface treatments, it is recommended that users send samples to our company for adhesion/compatibility or pollution and other related tests, which can be used in our company. After the report, it can be used according to the prescribed method.

　　 The constructor must have a complete record during the construction process, including the construction temperature, humidity, construction date, time, sealant product brand, batch number, whether to use primer, cleaning procedures, etc.

If the user encounters any quality or operational technical problems during the use of the sealant, he should notify the company’s technical department in the fastest way. We will provide enthusiastic, timely and thoughtful technical services. If there are major quality problems , The use of sealant should be stopped before being advised to continue using it. When using sealant to seal the joints, the main factors to be considered are the base material, primer, gasket material, etc.

　　The materials commonly used in construction are bricks, concrete, ceramics, marble, metal, glass, wood, etc. They are usually divided into porous materials and non-porous materials. Some materials have poor adhesion to sealants, and they can only be bonded to sealants after physical or chemical surface treatments. Full attention must be paid.

　　Metal protective coating and concrete waterproof coating may affect the bonding quality between the sealant and the substrate. These coatings are sometimes not easy to find in time, and it is not known whether there is a protective layer on the surface of the substrate when the adhesion is poor or damaged. For this reason, please consult with the company and the substrate manufacturer in advance to determine whether the joint treatment method or the appropriate primer should be selected before sizing. If necessary, the adhesion/compatibility test should be carried out to determine.

　　 Primer: The purpose of using the primer is to improve the adhesion between the sealant and the substrate. The sealant produced by Guangxi has good adhesion to most substrates and does not require primer. When the adhesion/compatibility test report issued by the Quality Inspection Department of the Photonics Company indicates that the primer needs to be used, the constructor must use the primer liquid prepared or designated by the company.

　　The proper seam setting of the cushion material requires the correct selection and use of the cushion material to ensure a reliable seal.