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What Kinds of Silicone Adhesives Are There?

May 27,2020 | Views: 28

What kinds of silicone adhesives are there?

The English name of silicone adhesive is SILICONE, which is a part of silicone products. It is mainly divided into deacetylation type, dealcoholization type, deamination type and oxime type. Glass adhesive is commonly known as silicone adhesive, because users buy silicone sealant mainly used for bonding and sealing glass, so it is called glass adhesive. Chemical components are polydimethylsiloxane, silicon dioxide polymer can be called silicone. Silicone rubber is a kind of ointment, once contacted with the moisture in the air, it will solidify into a tough rubber like solid material.

一、 Classification of silicone adhesives

Single component and two-component.
The curing of one component silicone adhesive is the change of physical properties by contacting with the moisture in the air;

Two component means that the silicone adhesive is divided into two groups, a and B. If any group exists alone, it can not form curing, but once the two groups are mixed, it will produce curing.

One component silicone glass adhesive is common in the market. According to the properties, one component silicone glass adhesive can be divided into acid adhesive and neutral adhesive. Acid glass adhesive is mainly used for general bonding between glass and other building materials. The neutral adhesive overcomes the corrosion of metal materials by acid adhesive and the reaction with alkaline materials, so it has a wider range of application, and its market price is slightly higher than that of acid adhesive. A special type of glass adhesive in the market is silicone structural sealant. Because it is directly used for metal and glass structure or non structural bonding assembly of glass curtain wall, the quality requirements and product grade are the highest among glass adhesives, and the market price is the highest.

1. It is mainly used for structural or non structural adhesive assembly between metal and glass of glass curtain wall.
2. It can directly connect the glass and the metal component surface to form a single assembly component, which can meet the curtain wall design requirements of full hidden or semi hidden frame.
3. Structural bonding and sealing of insulating glass.

二、 Use of silicone adhesive

1. Use: single component silicone glass glue can be used immediately. It is easy to knock it out of the rubber bottle with the glue gun, and its surface can be trimmed with a spatula or wood chips.

2. Adhesion time: the curing process of silicone adhesive is developed from the surface to the inside, and the surface drying time and curing time of silica gel with different characteristics are different (for the detailed description of curing time, please refer to the content of technical parameters in Chapter 4). Therefore, if the surface is to be repaired, it must be carried out before the surface drying of glass adhesive (acid adhesive and neutral transparent adhesive generally should be within 5-10 minutes, neutral transparent adhesive In general, the mottled glue should be within 30 minutes). If the color separation paper is used to cover a certain place, it must be taken away before the skin is formed after gluing.

3. Curing time: the curing time of glass adhesive increases with the increase of bonding thickness. For example, acid glass adhesive with a thickness of 12mm may take 3-4 days to solidify, but within about 24 hours, the outer layer of 3mm has been solidified. When bonded to glass, metal, or most wood, it has a peel strength of 20 pounds per inch after 72 hours at room temperature. If the place where glass glue is used is partially or completely closed, the curing time is determined by the tightness of the sealing. In an absolutely closed place, it is possible to remain uncured forever. If the temperature is increased, the glass glue will become soft. The gap between metal and metal bonding surface shall not exceed 25 mm. In all kinds of bonding occasions, including airtight conditions, the bonding effect of the equipment after bonding shall be comprehensively checked before use. During the curing process of acid glass adhesive, due to the volatilization of acetic acid, there will be a smell, which will disappear in the curing process, and there will be no peculiar smell after curing.

4. Bonding:
A. Wipe the metal and plastic surfaces completely, remove the oil stain, and then rinse all surfaces with acetone, and polish the rubber surface with sandpaper, and then wipe with acetone. Observe the precautions when using acetone.

B. Apply the glass glue evenly on the surface of the prepared object. If the two surfaces are bonded, place one side first, and then squeeze the other side with enough force to squeeze out the air, but pay attention not to extrude the glass glue.
C. Place the bonding device at room temperature and allow the glass adhesive to cure.

5. Sealing: use silicone glass adhesive for sealing occasions. Also follow the above steps. Squeeze the glass adhesive into the joint surface or gap to make the glass adhesive fully contact with the surface.

6. Cleaning: before curing, the glass glue can be wiped off with cloth or paper towel. After curing, it must be scraped off with a scraper or scrubbed with xylene, acetone and other solvents.

三、 Application fields of different silicone adhesives

Acetic silicone sealant
1. It is suitable for sealing, plugging, leakproofness and weatherproofness. It is suitable for both indoor and outdoor use (better indoor effect), with remarkable seepage and leakproofness effect.
2. Bonding various interior decoration of automobile, including: metal, fabric, organic fabric and plastic.
3. Engage the gasket on the heating and cooling equipment.
4. The metal surface shall be equipped with ribs without screw holes, nameplates and painted plastic materials.
5. Seal the window on the oven door, the flue, pipe joint and channel door on the gas appliance.
6. Provide instant forming leak proof gasket for gearbox, compressor and pump.
7. Seal the cabin and windows.
8. Sealing of cab glass window of trailer and truck.
9. Glue and seal equipment components.
10. Form an anti-wear coating.
11. Inlaid and filled with sheet metal lamination, pipe network and equipment casing.

Neutral weatherproof silicone sealant

1. It is suitable for all kinds of curtain wall weatherproof seal, especially recommended for glass curtain wall, aluminum plastic panel curtain wall and stone dry hanging weatherproof seal;
2. Joint sealing among metal, glass, aluminum, ceramic tile, plexiglass and coated glass;
3. Joint sealing of concrete, cement, masonry, rock, marble, steel, wood, anodized aluminum and painted aluminum surfaces. Primer is not required in most cases.

Structural Silicone  Sealant
1. It is mainly used for structural or non structural adhesive assembly between metal and glass of glass curtain wall;
2. It can directly connect the glass and the metal component surface to form a single assembly component, which can meet the curtain wall design requirements of full hidden or semi hidden frame;
3. Structural bonding and sealing of insulating glass.

四、 Development trend of silicone sealant

Based on hydroxyl terminated siloxane polymer and multifunctional siloxane cross-linking agent, the silicone structural adhesive is a high-grade adhesive sealing material with elastic bonding function, which is prepared by compounding, mixing, homogenizing and other processes. RTV has excellent high and low temperature mechanical properties and aging resistance. It is packaged in one component, fast curing, easy to use, stable storage, and waterproof in buildings Window and curtain wall structural glass assembly and architectural decoration occupy an important position in the market. With the breakthrough of silicone sealant product technology and the localization of production equipment in China, the number of production enterprises has been increasing in the past decade, with the rapid growth of product varieties and production, and the increasingly fierce market competition, showing the tendency of low price and cost competition, and the profit of enterprises has been declining year by year, especially when the supply of raw materials monomer is suddenly short and the price is doubled, some production enterprises are unable to bear the upstream and downstream Under the double pressure, we can only withdraw from the market, while some enterprises with strong strength and emphasis on technological innovation can transform the adverse factors and expand the market with high quality and high price products and new functional products. China is a big developing country. The housing construction (especially curtain wall) is in a period of continuous growth. The total demand for building sealant is still growing. Facing the growing market, low price and cost competition can only be a short-term market behavior, and only focusing on quality and technological innovation can it develop stably in the construction market.

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