China's new waterproof material industry has gone through more than 20 years of development and has made gratifying achievements. Under the new economic situation, how should China's waterproof material industry go? What new type of waterproof material should be developed? According to the current development trend of waterproof materials at home and abroad, the author combined with his own work experience for many years to make recommendations for the reference of the national waterproof industry colleagues.
Synthetic polymer waterproofing membrane: consolidate the application of polyvinyl chloride and EPDM waterproofing membranes, promote the formation of a polyethylene polypropylene (polypropylene) waterproof membrane and polymer cement bonding system, and accelerate the research and development of wet-laid self-adhesive Synthetic polymer waterproofing membranes, limiting the use of chlorinated polyethylene waterproofing membranes, eliminating reclaimed rubber waterproofing membranes.
Waterproof coating: Consolidate the application of polyurethane waterproof coating, polymer cement waterproof coating, cement-based waterproof coating, promote cement-based penetrating crystalline waterproof material and silicone waterproof coating, develop and apply sprayed polyurea polyurethane waterproof coating, research and application of high solid content aqueous asphalt Base waterproof coating, promotion and application of road and bridge waterproof coating and other special purpose waterproof coating. It is forbidden to use contaminated coal tar waterproof coatings.
Polymer modified bitumen membrane: Consolidation of SBS, APP modified bitumen membrane and self-adhesive rubber bitumen membrane, development of wet-laid self-adhesive modified bitumen membrane, promotion of roof greening practices and applications The root-resisting coiled materials are actively applied to the glass-fiber tire asphalt shingles, and the use of composite-typhoon-bitumen-based waterproofing membranes and paper-felt linoleum is prohibited, and the use of coal tar sand-surface waterproofing membranes is prohibited.
Sealing material: consolidate the application of acrylate sealing material (mid-range), strongly promote the application of poly*, silicone, polyurethane and other high-grade sealing materials, and actively study the application of sealing material for the special primer, in order to improve the sealing material's adhesion and water resistance, durability Sex. It is forbidden to use plastic grease, PVC cement and other sealing materials.
Water Repellent: Consolidate the application of general-purpose water repellent, advocate M1500 water-based penetration waterproof agent and DPS, and promote the application of silicone water repellent and fatty acid water repellent. Restrict the use of water repellents with high chloride ion content and prohibit the use of powdered water repellents with excessive alkali content.
Waterproof Mortar: Actively apply polymer cement waterproof mortar, promote polypropylene fiber (PP) and nylon fiber and wood fiber anti-crack waterproof mortar, research and application of zeolite siliceous waterproofing agent. Vigorously promote the use of commercial mortar (waterproofing, heat preservation, antisepsis, cementation, filling and self-distribution of special mortar).
Grouting material: cement-based grouting material for foundation reinforcement, cement-based epoxy grouting material for structural reinforcement, especially low-viscosity, moisture-cured epoxy grouting material, super-early self-leveling grouting cement and polyurethane, acrylate for waterproof plugging Grouting material. A composite grouting process is recommended for different engineering conditions. It is forbidden to use toxic and contaminated grouting materials such as propidium chloride.
Waterproof and heat insulation material: consolidate the application of extruded, molded polystyrene board and mortar external insulation system, and actively promote the use of spray polyurethane hard foam body waterproof insulation material, the appropriate development of the application of plastic powder polystyrene insulation mortar system. Limit the use of heat-absorbing materials such as expanded vermiculite and expanded perlite. Do not use loose material insulation.
Bentonite waterproof material: Active application of natural waterproof material - sodium bentonite waterproof material, specific varieties of bentonite water swelling seal, bentonite waterproof board and bentonite waterproof blanket and bentonite powder waterproof material.
Special waterproof material: choose to apply waterproof metal membrane, research and application of cultural relic protection and other special waterproof coating.
Sanding Belt
Abrasive belt is a belt-shaped tool that can be ground and polished, which is made by bonding abrasives to flexible materials such as paper and cloth with a binder. It is a main form of coated abrasives. Its basic composition is: base material, abrasive and binder, collectively called the three elements of abrasive belt. Abrasive belt is the main tool of the sanding process. Abrasive belt grinding is a soft grinding method, which is a compound processing abrasive tool with multiple functions of grinding, grinding and polishing.
Abrasive tools are tools for grinding, grinding and polishing. Most of the abrasives are artificial abrasives made of abrasives and bonding agents, and natural abrasives are also directly processed from natural ore. In addition to being widely used in machinery manufacturing and other metal processing industries, abrasive tools are also used in the processing of non-metallic materials such as food processing, paper industry and ceramics, glass, stone, plastic, rubber, and wood.
Abrasives are divided into natural abrasives and artificial abrasives. All materials that can be used for grinding or grinding in nature are collectively referred to as natural abrasives.
Natural abrasives mainly include: natural corundum and garnet
Artificial abrasives mainly include: white corundum, brown corundum, silicon carbide, zirconium corundum, synthetic diamond, cubic boron nitride.
How to choose a suitable abrasive belt and further improve the smoothness and flatness of sanding is a very important issue in the use of abrasive belts. Due to the differences in the three major components of abrasive belts and various characteristic factors, abrasive belts can be divided into many varieties according to different grinding objects, grinding conditions and grinding requirements. The following is the classification of abrasive belts according to abrasives. Different abrasive belts are suitable for different products. The following types of belt operations are: automatic grinding, mechanical hand grinding, desktop grinding, and manual tool grinding.
Types of abrasive belts (according to abrasives):
1: Accumulated abrasive belt
Application: Widely used in polishing various non-alloy, low-alloy and high-alloy steel, stainless steel, brass, bronze and other non-ferrous metals. Good self-sharpening, long service life, uniform grinding volume and uniform surface roughness.
2. Brown corundum belt
Application: Widely used in metallurgy, machinery, shipbuilding, wood, building materials, textile printing and dyeing industries. Grinding and polishing of bamboo and wood products, decorative panels, stainless steel, non-ferrous metals and other complex surfaces. Fast cutting, heat resistance, long service life, efficient wear resistance.
3. Ceramic abrasive belt
Application: Widely used in grinding chromium steel, chromium-nickel steel, stainless steel, high-alloy steel, nickel-based alloy, titanium alloy, brass and bronze, etc., with good self-sharpening, strong grinding, and large removal of grinding materials.
4. Silicon carbide belt
Application: Widely used in the grinding and polishing of brass, bronze, titanium alloy, aluminum alloy, glass, ceramics, minerals, stone, rubber, and synthetic materials. The sand surface is sharp, with very high strength and grinding ability, suitable for grinding medium and high density plates. The bucky has strong tension and ultra-wide sub-tension, which can be used for ultra-large abrasive belts.
5. Zirconium corundum abrasive belt
Application: Widely used in the grinding and polishing of steel, alloy steel, cast iron and non-ferrous metals, medium load or heavy load powerful grinding. The rigid polyester fabric is resistant to strong tension and impact, has high abrasion resistance, and has excellent comprehensive cost performance.
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