what is sealant? what are the classifications of sealants?
[wanguan hardware and mechanical network] what is sealant? sealant is a sealing material that deforms with the shape of the sealing surface, is not easy to flow, and has a certain degree of adhesion. it is an adhesive used to fill configuration gaps and achieve sealing effect. it has the functions of leakage prevention, waterproofing, vibration prevention, sound insulation and heat insulation. sealants can be divided into three categories: elastic sealants, liquid sealing gaskets and sealing putty.
(jiangxi new materials co., ltd.)
sealant classification
1. according to the classification of chemical components, it can be divided into rubber type, resin type, oil-based type and natural polymer sealant. this classification method can better predict the characteristics of polymer materials, such as warmth, sealing and adaptability to various media.
rubber type: this type of sealant is based on rubber. commonly used rubbers include polysulfide rubber, silicone rubber, polyurethane rubber, chloroprene rubber and butyl rubber.
resin type: this type of sealant is based on resin. commonly used resins include epoxy resin, unsaturated polyester resin, phenolic resin, polyacrylic resin, polyvinyl chloride resin, etc.
oil-based type: this type of sealant is based on oil. commonly used oils include various vegetable oils such as linseed oil, castor oil and tung oil, as well as animal oils such as fish oil.
2. according to the application occasions, it can be divided into high temperature resistant type, cold resistant type, pressure resistant type, etc.
3. according to the classification of film-forming properties, it can be divided into dry adhesive type, dry peelable type, non-dry sticky type and semi-dry viscoelastic type. this is also a commonly used sealant classification method in china.
4. according to classification, it can be divided into building sealants, automotive sealants, insulation sealants, packaging sealants, mining sealants and other types.
5. according to the performance classification after construction, it can be divided into two types: cured sealant and semi-cured sealant. cured sealant can be divided into rigid and flexible. rigid sealant is a solid formed after vulcanization or solidification. , rarely elastic, cannot bend, and usually the joints cannot be moved; flexible sealants are elastic and soft after vulcanization. non-curing sealant is a soft solidifying sealant that retains its non-drying tackifier and continuously migrates to the surface after construction.
glass glue is a material used to bond and seal various glass and other base materials. mainly divided into two categories: silicone glue and polyurethane glue (pu). silicone glue sealant – what we usually call glass glue, is divided into two types: acidic and neutral (neutral glue is divided into: stone sealant, anti-mildew sealant, fireproof sealant, pipe sealant, etc.
