The application of building sealant is becoming increasingly widespread nowadays, but even those who have been engaged in construction for many years have only a partial understanding of sealant. We hope this article can provide reference for colleagues, and if there are any inappropriate aspects, please let us know more.
Speaking of glueFirst, let's talk about the classification of adhesives. Building adhesives can be basically divided into the following categories:
1. Building sealant: used for simple wall jointing.
2. Silicone weather resistant sealant (neutral adhesive): used for waterproof sealing.
3. Silicone structural sealant: used for structural bonding and fixation.
4. Fire sealant: used for fire sealing.
5. Butyl rubber: used for the first sealing of insulating glass.
6. Foam glue: used for sealing seams and also has waterproof effect.
According to the classification of glue, the specific models of each manufacturer are also different. Below is a brief introduction to the basic knowledge of glue& nbsp;.
1. Silicone glass adhesive can be divided into two categories based on product packaging: single component and two-component. Single component silicone adhesive undergoes physical property changes upon contact with moisture in the air during curing; Two component refers to the silicone adhesive divided into two groups, A and B. Neither group alone can form curing, but once the two groups are mixed, curing occurs. The common one in the market now is single component silicone glass adhesive.
Single component silicone glass adhesives are divided into two types based on their properties: acidic adhesives and neutral adhesives. Acidic glass adhesive is primarily used for general bonding between glass and other building materials. Neutral adhesive overcomes the characteristics of acidic adhesive corroding metal materials and reacting with alkaline materials, therefore it has a wider range of applications and a slightly higher market price than acidic adhesive.
A special type of glass adhesive on the market is silicone structural sealant, which is directly used for metal and glass structures or non structural bonding installation of glass curtain walls. Therefore, its quality requirements and product level are the highest among glass adhesives, and its market price is also the highest.
2. Summary:.
Single component silicone glass adhesive is a substance similar to ointment that solidifies into a tough rubber like solid upon contact with moisture in the air. Silicone glass adhesive has strong adhesion, high tensile strength, as well as weather resistance, vibration resistance, moisture resistance, odor resistance, and adaptability to large changes in temperature and heat. In addition, with its wide applicability, it can achieve adhesion between most building materials products, so its application value is very high.
Silicone glass adhesive, because it does not flow due to its own weight, can be used for joints over the top or side walls without sinking, collapsing, or flowing away. It is primarily used for dry cleaning of metals, glass, most oil-free wood, silicone resin, sulfurized silicone rubber, ceramics, natural and synthetic fibers, as well as bonding to many paint and plastic surfaces. High quality silicone glass adhesive will not experience issues such as difficulty in kneading or changes in physical properties when used below zero degrees Celsius. The fully cured silicone glass adhesive can continue to be effective when used at temperatures up to 204 ℃ (400oF), but its useful time will be shortened when the temperature reaches 218 ℃ (428oF).
Silicone glass adhesive comes in various colors, including black, porcelain white, transparent, silver gray, gray, and antique bronze. Other colors can be customized according to customer requirements.
3. The use of glue

Acidic glass adhesive

1. Suitable for sealing, blocking, leak proof, and weather resistant purposes, both indoor and outdoor are suitable (indoor effect is better), with significant anti-seepage and leak proof effects. 2. Adhesive bonding of various interior decorations of automobiles, including metal, fabric, organic fabric, and plastic. 3. Gaskets for joining heating and cooling equipment. 4. Install non threaded ribs, nameplates, and painted plastic materials on the metal surface. 5. Seal the windows on the oven door, the flues on gas appliances, pipe joints, and channel doors. 6. Provide instant formed leak proof pads for gearboxes, compressors, and pumps. 7. Seal the ship's cargo hold and windows. 8. Sealing of trailer and truck cab windows. 9. Adhesive and sealing equipment components. 10. Form an anti-wear coating. 11. Embedding and filling thin metal sheet laminates, pipeline networks, and equipment casings.
Neutral weather resistant adhesive

1. Suitable for weather resistant sealing of various curtain walls, especially recommended for glass curtain walls, aluminum-plastic panel curtain walls, and stone dry hanging weather resistant sealing; 2. Sealing of joints between metal, glass, aluminum, ceramic tiles, organic glass, and coated glass; 3. Sealing of joints on the surface of concrete, cement, masonry, rock, marble, steel, wood, anodized aluminum, and painted aluminum. In most cases, primer is not required.
Silicone structural adhesive

1. Mainly used for structural or non structural bonding installation between metal and glass in glass curtain walls. 2. It can directly connect glass and metal components to form a single installation component, meeting the requirements of curtain wall planning for fully concealed or semi concealed frames. 3. Structural bonding and sealing of insulating glass.
Constraints

Various silicone glass adhesives are subject to the following constraints when used: 1. Construction is not suitable in areas that have been immersed in water for a long time; 2. Not compatible with materials that may leak oil, plasticizers, or solvents; 3. Frosty or damp surfaces cannot adhere together; 4. Completely sealed areas cannot be cured (silicone gel needs to be cured by moisture in the air); 5. The surface of the substrate is not clean or firm.
Acidic glass adhesive has the following constraints:.
Acidic silicone glass ?The product has excellent characteristics of water resistance, oil resistance, aging resistance, and corrosion resistance And it is known for its good sealing, strong adhesion, good elasticity, and long service life.
10. Precautions for polysulfide building sealant:.
1. Shelf life: After mixing components A and B of the two-component polysulfide building sealant, the mixture gradually thickens and cannot be used beyond the shelf life. The ambient temperature during use has a significant effect on the curing of the sealant. The higher the temperature, the shorter the shelf life. When the temperature is too low, the curing speed slows down. The construction temperature should be between 5 ℃ and 35 ℃.
When using, the width and depth ratio of the sealed material should be appropriate.
When storing polysulfide building sealant, it should be protected from direct sunlight and placed in a cool and dry place; It can be stored for six months at an ambient temperature of 5-26 ℃, and prolonged storage can affect its physical and functional properties. For example, SS521 is a single component, neutral curing silicone structural sealant specially designed for structural bonding and sealing of glass, aluminum curtain walls, glass skylights, and metal structural engineering. It has excellent structural bonding and weather aging resistance. After artificial accelerated weather aging testing, the physical and chemical functions of the sealant have not changed significantly. Use a glue gun to squeeze the glue from the sealant cylinder to the area that needs to be bonded and sealed. The sealant absorbs moisture from the air at room temperature and solidifies into an elastic body, forming a useful seal. General product characteristics: single component, neutral curing, non corrosive to metals and coated glass; Excellent weather aging resistance, aging resistance, UV resistance, ozone resistance, and water resistance; Excellent high and low temperature resistance, with little change in function within the range of -30 ℃ to 90 ℃; Has excellent adhesion to most building materials; Excellent compatibility with other neutral silicone adhesives. Primary use: Structural bonding and sealing for glass, aluminum curtain walls, glass skylights, and metal structural engineering; Hollow glass is bonded and sealed twice.
Compliant with specifications

National standard GB 16776-2005& nbsp; American standard ASTM C 1184-2005.
12. Application constraints: Not suitable for all materials that may leak oil, plasticizers, or solvents, such as the surface of oil soaked wood; Not suitable for use in poorly ventilated areas, as silicone structural sealant needs to absorb moisture from the air and solidify; Not suitable for use on frosty or damp surfaces; Not suitable for use in areas that are continuously submerged in water or in areas that are humid all year round; When the surface temperature of the material is below 10 ℃ or exceeds 40 ℃, it is not suitable for construction. Silicone building sealant should be used for non load bearing joints of glass curtain walls; Choose a full glass curtain wall with adhesive joints for force transmission, and it is necessary to use silicone structural sealant for the adhesive joints; Point supported glass curtain wall: Silicone building sealant should be used for joint filling Except for full glass curtain walls, silicone structural sealant should not be injected on site, and silicone structural sealant should not be used as silicone building sealant. Neutral silicone structural sealant is necessary for bonding glass and aluminum profiles in hidden and semi hidden frame glass curtain walls; When using coated glass for full glass curtain walls and point supported curtain walls, acidic silicone structural sealant should not be used.