Tips For Silicone Sealant

Silicone sealant for construction is widely accepted as the waterproof sealing material widely used in interior and exterior decoration of various buildings. However, with the rapid development of silicone sealants for construction, such as colloid hardening, embrittlement and chalking, oil leakage, cracking of joints, failure of insulating glass unit parts, structural bonding deterioration, etc. appear. Part of the reason is that due to the vicious competition in the market, many manufacturers have added plasticizers in the production of silicone sealants for construction, but a large part is due to consumers' lack of understanding of product performance or improper operation of the constructors. Affects the overall performance of silicone gum products. 

The following is a basic introduction to the silicone sealant for construction and some misunderstandings and improper methods during the purchase and use.

A. Characteristics of silicone sealant:
Silicone sealant refers to the sealant produced by linear polysiloxane as the main raw material, also known as silicone sealant. The polymer backbone of the silicone sealant is mainly composed of silicon-oxygen-silicon bonds. During the curing process, the cross-linking agent reacts with the base polymer to form a network-like Si-Q-Si skeleton structure. Compared with other organic polymer sealants (such as polyurethane sealant, acrylic sealant, polysulfide sealant, etc.), the most remarkable feature is excellent high temperature resistance and weather resistance. B. Classification of building silicone m sealant: Most of the silicone sealant used in construction is a room temperature vulcanization (RTV) condensation type curing system, that is, it does not need to be heated during curing, and can be cured at room temperature, during curing. Some small molecules will be released. 

1. Classification according to curing system:

According to the type of small molecules released during curing, the silicone sealant for building construction can be mainly divided into deacetic acid type, deketone type, dealcohol type, and dealuamine type. 

2. Classification according to the number of components:

(1) According to the number of components of the product, silicone sealants for building construction can be generally divided into two categories: single component silicone rubber and two component silicone rubber.

(2) Hidden dangers in the production process of silicone sealant for construction: Nowadays, due to the disorderly development of the domestic market, the market is viciously competitive. In addition, due to the rising raw materials and increasingly fierce competition, many enterprises and even famous enterprises, in order to pursue profits, the cost of reducing the product is reduced by reducing the cost. The main reason is to add plasticizer to change the brightness of the appearance and increase the selling point. 

2) Adding additives to add more fillers and reduce costs. 

3) Use recycled raw materials such as base rubber, silicone oil, etc. to hit the market at low prices. At least 80% of the silicone sealant products used in construction that are now on the market add more or less plasticizer-white oil. White oil, liquid paraffin oil, is a colorless, odorless, odorless, non-fluorescent transparent oily liquid obtained by high pressure hydrotreating of petroleum lubricating oil fractions. It is flammable and volatile; white oil is physically added for building construction. Silicone sealant: Features one can reduce the amount of silicone base polymer, reduce product cost, improve extrusion, softness and brightness. Hazard--cure speed is slowed down, oil leakage is polluted, the surface is easy to wrinkle, sticky dust is accumulated, and the mechanical properties are low with the continuous precipitation of white oil, and the rubber joint becomes hard, shrink, debonded and cracked in half a year. It will bring serious hidden dangers to the quality of the project.

3. What should I pay attention to when purchasing silicone sealant for construction?

1) Recognize the brand. Effective registered trademarks, clear image recognition, reasonable price positioning, and perfect after-sales service are the criteria for the recognition of branded products. 

2) Look at the packaging. When you look at the carton, there is no product name, factory name, specification, origin, color, date of manufacture, whether there is a certificate of conformity, quality guarantee, or product inspection report in the carton. Second, look at the use, usage, precautions of the plastic bottle, etc. Clear and complete; three to see if the net content is accurate, the manufacturer must indicate the specification and net content on the bottle. 

3) Gum quality.First smell the odour, second compare the gloss, third check the particles, fourth look at the bubbles, fifth check the solidification, sixth exam the tensile and stamps.
Related News
  • 10 Common Adhesive Properties of Adhesive

    10 Common Adhesive Properties of Adhesive

    May 25, 20181. Instant adhesion. Instant adhesive is not required to be heated and pressurized. It has the characteristics of fast curing and strong bonding strength. The pull of a 6.45 square centimeter adhesive...view
  • What Does Silicone Mean

    What Does Silicone Mean

    October 17, 2018(1) Silicon is a very rich element on the earth, and silicone is the product after the organic silicon is organized. Silicone, also known as silicone or siloxane, is a siloxane organic polymer that is...view
  • How do Silica Gel and Metal Stick? The Complete Scheme of Silicone Glue Bonding

    How do Silica Gel and Metal Stick? The Complete Scheme of Silicone Glue Bonding

    November 11, 2020Silicone glue has the properties of softness, flexibility, and high temperature resistance. Therefore, it is often necessary to coat a layer of silica gel on the metal to change the properties of the ...view
  • The Characteristics of Adhesives And Bonding Techniques

    The Characteristics of Adhesives And Bonding Techniques

    May 25, 2018The new and unique adhesive and adhesive technology, have the special function, which can achieve the multiple purpose, with the riveting, welding, the spiral joint, the bond, the tenon and so on. For...view
  • Knowledge of the Storage Environment of Adhesive for Silicone

    Knowledge of the Storage Environment of Adhesive for Silicone

    November 12, 2020Silicone adhesive products have strict requirements on the storage environment. A poor storage environment will reduce the performance of the adhesive for silicone and even solidify the product. In se...view
  • Tianyongcheng Silicone Help

    Tianyongcheng Silicone Help

    December 19, 2017China Chemical and Physical Power Industry Association will hold "The 12th Chinese International Battery Communication /Exhibition", which is unprecedented in scale, on 24th to 26th in May ,2016. At t...view