After the 1970s, sealant has begun to be used for joint sealing of building structures, and gradually become the main material.This materials may be classified function based polymer and two kinds of methods, it is important to classify the products according to the purpose and the sealing function, has compiled the standard glass curtain wall joint sealant, concrete joint sealant, mouldproof, stone sealant sealant, metal color plate sealing glue, window with sealant, etc., as needed and possibly fire sealant, insulating sealant, stopping sealant, etc., Its physical and mechanical properties are classified according to ISO 11600 standard, and the specific technical requirements are specified respectively.In terms of design material selection, product research and engineering application, it is no longer important to classify basic polymers according to their types. The key is that each product meets the purpose and specific functional requirements.First list several categories of sealant and related technical requirements.

  1) curtain wall glass joint sealant

  The sealant with adhesive sealing curtain wall glass joint is basically silicone sealant at present.It is a viscous fluid that can be extruded by one component. After extrusion, it does not sag or deform. The color is mainly black.It is used for the bonding sealing of curtain wall glass-glass joint under the alternating action of environmental conditions such as sunlight, rain and snow and wind pressure for a long time, and bearing large joint displacement. It can also be used for other joint sealing of building glass.It is divided into 4 grades according to displacement capacity and modulus.

  2) Sealant for building Windows

  Sealant used for window openings, window frames and window glass sealing inserts.The appearance is a viscous fluid that can be extruded by a single component, without sagging or deformation after extrusion.Color transparent, translucent, tawny, white, black and so on.The products are divided into 3 levels according to the modulus and displacement capacity.This kind of sealant is mainly used for joint sealing and does not bear structural stress.To meet the requirements of sealant can be silicone, modified silicone, polyurethane, polysulfide type, etc., hole - window seal can be silicified acrylic acid type or acrylic acid type.

  3) concrete building joint sealant

  Definition: sealant used for sealing deformation joints of concrete building roof and wall.

Appearance for a single component support can be squeezed into a viscous fluid.

  Due to the wide range of use conditions such as component material, size, use temperature, structural deformation and foundation settlement, the displacement capacity and durability requirements of sealant joints differ greatly, and the products include all six levels from 25 to 7.5.According to the fluidity, it is divided into N type -- used for vertical joints, no sag and deformation after extrusion;Type S - Self leveling for horizontal joints.Mainly includes neutral silicone sealant, modified silicone, polyurethane, polysulfide type, also includes acrylic acid, silicified acrylic acid, butyl sealant, modified asphalt caulking paste, etc., the last three are mainly used for building internal joint sealing.

  4) Mildew proof sealant

  Self does not grow mold or can inhibit mold growth sealant.Appearance for a single component support can be squeezed into a viscous fluid.

  Product classification according to mildew resistance is 0 and 1, and according to the modulus and displacement capacity is divided into 20LM, 20HM, 12.5E three grades.It is mainly used for joint sealing of kitchen, toilet bath, whole washroom, aseptic operation room, operating room, microbiology laboratory and sanitary ware.

  5) stone joint sealant

  Sealant for natural stone joints of building curtain wall and decoration.Appearance single component support can be squeezed into a viscous fluid.

  Classification: this kind of sealant is divided into five grades according to displacement capacity and modulus.Used for granite, marble and other natural stone joint structure waterproof, weatherproof sealing and decoration.Applicable sealant includes neutral silicone sealant, polyurethane, polysulfide type, also includes acrylic type sealant.

  6) Construction sealant for coated steel plate

  Sealant for joint sealing of color coated steel plate in light steel structure building.The appearance of a single component support can be squeezed into a viscous fluid, with a variety of colors close to the steel plate.This type of sealant has seven grades.The products to meet the requirements of the standard are mainly neutral silicone sealant, polyurethane, polysulfide elastic sealant.It is mainly used for waterproofing, corrosion-proof and weather-proof sealing of the joints of roof or wall of colored coated steel plate in light steel structure building.Due to the large temperature expansion coefficient of steel, the product Z large displacement capacity requirements up to ±50%;The stable bonding of sealant is related to the color coating material, and the product is required to have good bonding and peeling strength.

  Polyurethane is called polyurethane, is the main chain containing repeated carbamate group of macromolecular compounds.It is composed of organic diisocyanate or polyisocyanate and dihydroxyl or polyhydroxyl compound copolymerization.Polyurethane material, very widely used, can replace rubber, plastic, nylon, etc., used in airports, hotels, building materials, car factories, coal factories, cement factories, high-grade apartments, villas, landscaping, colorful stone art, parks and so on.