Silicone development history-HongYe silicone

Since the 1970s, the sealant has begun joint sealing for building structures, and gradually become the main material. Such materials can function and two methods of the base polymer., It is important to use and the sealing function of the product classification standard has been prepared glass curtain wall joint sealants, concrete joint sealants, stone sealant, mildew sealants, metal color plates sealant, window sealant, as the need may fire sealant, insulating sealant, corrosion resistance sealant, etc., and its physical and mechanical properties according to ISO 11 600 standard classification, respectively, provides a function of the unique technical requirements. In terms of material selection, product research and engineering applications, according to the type of base polymer classification does not seem important, the key is the products meet the purpose and specific functional requirements. Listed first, sealants and related technical requirements of the several classifications. 1) The glass curtain wall joint sealant Adhesive sealant sealed glass curtain wall joints, is basically a silicone type sealant. Appearance of support for one-component installed can squeeze the injection of viscous fluid and extrusion does not sag, no deformation, the colors are mainly black. Alternating the role of environmental conditions such as sunlight, rain, snow and wind pressure for long-term bear to withstand the large joint displacement of the curtain wall of glass - glass joints adhesive seal can also be used for architectural glass in the other joint sealing. Divided into four levels according to the displacement capacity and modulus. 2) the construction window sealant For opening in a wall, window frames and window glass seal inserts installed sealant. The appearance of support for one-component installed can squeeze the injection of viscous fluid, extrusion does not sag, no deformation. The colors are transparent, translucent, brown, white, black, and so on. Products according to the size of the modulus and the displacement capacity is divided into three levels. Class sealant for seam sealing, does not withstand the structural stresses. Adapt to the requirements of sealant can be silicone, modified silicone, polyurethane, polysulfide-type hole - sealing window frames can be the silicide acrylic or acrylic. 3) concrete construction joint sealant Definition: for concrete roofing, wall deformation joint sealant sealed. Look for the one-component support loaded squeeze a viscous fluid injection. Conditions of use due to the component material, size, temperature, deformation structure, foundation settlement affect a wide range of capability and durability requirements of the sealant joint displacement difference, product, including all six levels of 25 to 7.5. Divided into N-type mobility - for vertical seams and extrusion does not sag, and no deformation; S - type - self-leveling for horizontal joints. Neutral silicone sealant, modified silicone, polyurethane, polysulfide type, include acrylic acid, the silicide acrylic acid, butyl type sealant, modified bitumen caulking ointment, the latter three used in the construction sealed internal seams. 4) mildew sealant Itself is not long mold or sealant can inhibit fungal growth. Look for the one-component support loaded squeeze a viscous fluid injection. Product classification according to the mildew resistance of 0 and 1, according to the modulus and displacement divided into 20LM, 20HM, 12.5E three levels. Mainly used in the kitchen, and overall restroom toilet and bathroom, sterile operating room, operating room and microbiological laboratories and sanitary ware and other building joint seal. 5) Stone of joint sealants Natural stone joints for curtain wall construction and decoration of the sealant. The appearance of one-component sticks squeeze note viscous fluid. Rating: class sealant displacement capacity and modulus divided into five levels. For granite, marble and other natural stone joints structural waterproofing, weather sealing and decorative. Applies sealant, neutral silicone sealant, polyurethane, polysulfide type include acrylic sealant. 6) coated steel construction sealant Light steel structure building color coated steel joints sealed with sealant. Fitted look for the one-component support can be squeeze note viscous fluid, with color color close to the steel plate. Class sealant seven levels. Products to meet the requirements of the standard neutral silicone sealant, polyurethane, polysulfide-elastic sealant. Mainly used for light steel structure building color coated steel joints light steel structure color-coated steel roof or wall seams, waterproof, corrosion resistant and weather seals. Steel thermal expansion coefficient, the maximum displacement capacity requirements of up to ± 50%; the sealants stable bond with the material of color coated products good adhesive peel strength. 3 base polymer sealant 1) Construction Silicone Sealant Definition: of organosiloxane liquid silicone rubber-based sealant. Appearance: squeeze note viscous fluid, the case of the curing of moisture in the air, while the release of low molecular weight product. Curing the product of the precipitation of acetic acid or formic acid for acid glue, precipitation of non-acidic products for a neutral glue, such as alcohol type, off the oxime type, off the amine. Acidic sealant is easy to cause metal corrosion, concrete acidification, but the associated good adhesion to glass; neutral sealant to use a wider range, it should be noted that some dealcoholized storage delay curing, not even curing phenomenon. Silicone sealant high temperature stability, low temperature flexibility, good elasticity, weathering resistance, water resistance, adhesion stability with glass and other features. However, the silicone sealant should not be used for parts to be painted Tu Shi, and should not be used to withstand abrasion, tear, and puncture parts, but also note that some products are easy to oil leakage pollution substrate. One-component type, there are two-component type. Use is divided into the concrete with two types of aluminum alloy and glass. Products according to the displacement capacity is divided into four levels. 2) construction with polyurethane sealant Definition: double-isocyanate reaction of polyether polyol polymers based sealant. Appearance for the extrusion of viscous fluid injection, chemical curing (double barreled), or exposure to air, moisture curing (one-component, sticks). For the construction joint sealing of concrete and metal structures, squares, roads, bridges, airports, reservoirs, oil storage structure, dam, etc. can also be used seams waterproof. According to the displacement capacity and modulus of more than one level. Extremely low permeability of polyurethane sealant, oil resistance, solvent resistance, water resistance, aging resistance, high strength, good elasticity, adhesion stability, tear, abrasion resistance, puncture resistance. The products are mostly one-component, two-component type. When the sealant used for the intended purpose should be to have the appropriate technical performance. 3) Construction polysulfide sealant Definition: The liquid polysulfide rubber-based sealant. The appearance of a viscous fluid, squeeze the chemical curing (double barrels) or the case of moisture in the air curing (one-component, cigarettes). The products are one-component type and two-component type. One-component type by moisture curing; two-component type rely on chemical curing. The product shall be the displacement capacity and modulus grading. General one-component type curable slow, two-component products to adjust the mixing ratio of the two groups, to adjust the expectations of curing time for the elastomer. Polysulfide sealant has excellent oil resistance, solvent resistance, aging resistance, acid and alkali resistance, low permeability, heat resistance, water resistance, flexibility, and stable bond. 4) construction with acrylic sealant Definition: polyacrylate resin-based sealant. Appearance: viscous fluid can squeeze one component sticks. Products to the emulsion are mostly rare solvent-based products. Emulsion products, low cost, can be used wet interface, rely on evaporation of water curing, curing can not rain water, mainly used for building the internal joint seals. The solvent-free poison emulsion acrylic sealant, after curing, water-resistant, anti-aging, oil, sufficient elongation and adhesion. In recent years, the silicone modified acrylic sealant has better performance, especially water resistance, aging resistance is much higher than general acrylic sealant. 5) chlorosulfonated polyethylene construction sealant Chlorosulfonated polyethylene-based plastic with curing agents, accelerators, softeners, fillers, blending, grinding into the sealant. The product is a viscous paste, crust, agglomeration and segregation. The products are mostly for one-component cartridge. Mainly used for wall seams, windows, door frames and inserts installed glass