The story behind the "price war" of waterproof material
2021-05-02
Nowadays, tar-based polyurethanes are the most widely used in home improvement waterproof materials. Coal tar contains a large number of aliphatic and aromatic compounds, and has a strong irritating odor. Among them, cesium, naphthalene and other components are extremely harmful to the human body. In 1997, the Beijing Municipal Construction Commission proposed the hope that production enterprises will develop environmentally friendly polyurethane waterproof coatings.
Home-installed waterproof materials At present, there are many kinds of waterproof materials on the market, including domestic, imported, and joint ventures; there are high-grade, mid-range, and low-grade. Home-installed waterproof material is commonly used in petroleum asphalt polyurethane waterproof coating, environmental protection polyurethane waterproof coating and polymer cement waterproof coating.
Polyurethane waterproof coating has been widely used in waterproof engineering because of its excellent physical and chemical properties. Of these, tar-based polyurethanes are the most widely used.
However, with the development of society and the improvement of people's living standards, people began to pay more attention to environmental protection and their own health of home improvement waterproof materials. Coal tar contains a large number of aliphatic and aromatic compounds, and has a strong irritating odor. Among them, cesium, naphthalene and other components are extremely harmful to the human body.
The pollution of tar-type polyurethanes to the environment has drawn increasing attention. In 1997, the Beijing Municipal Construction Commission proposed that manufacturers wish to develop environment-friendly polyurethane waterproof coatings suitable for home-improvement waterproof materials; at the end of 1998, it issued the "Restriction and elimination of tar-type polyurethane waterproof coatings.
Analysis: Home-made waterproof material purchase methods and performance differences of similar materials
The Beijing Municipal Construction Committee also encourages the development and recommendation of six types of environmentally friendly polyurethane waterproof coatings; (1) one-component polyurethane waterproof coatings; (2) color polyurethane waterproof coatings; (3) inorganic filler type polyurethane waterproof coatings; (4) water curing Polyurethane waterproof coating; (5) Petroleum pitch-based polyurethane waterproof coating; 6) Petroleum Resin-based polyurethane waterproof coating; The former four are used in the market due to their high cost and the proportion of the latter two has become the direction of development of various companies. , and has been applied in the market. Home improvement waterproof material is now advocating the promotion of non-tar type polyurethane waterproof coating, mainly based on environmental protection requirements, the difference between tar type and non-tar type polyurethane waterproof coating, smell tar type: there is a serious irritating odor, coating film has an odor; Tar type: only slight odor or odorless, no obvious odor.
2, coating combustion tar type: a pungent odor, resulting in thick black smoke and the formation of black floc formation, and rapid combustion; non-tar type: a pine smell or a slight odor, produce a small amount of black smoke, burning slow , leave the fire flammable. 3. Mixed type tar type: The viscosity increases at the initial stage of mixing, that is, there is a thickening phenomenon when stirring; Non-tar type: The viscosity does not change during compounding, and there is no thickening phenomenon.
The above three methods can basically determine qualitatively the tar-type and non-tar-type polyurethane waterproof coating, which can prevent the tar-type polyurethane coating from counterfeiting the non-tar type so that the excellent home-installed waterproof material can enter the market. Polymer cement waterproof coating (JS coating) is a two-component water-based architectural waterproof coating made of polymer emulsion such as acrylic ester and cement, and added with other admixtures. It has the characteristics of 'hardness and softness' and has both polymer coating properties. The extensibility and water repellency of the film also have the advantages of high strength of the hydraulic binder and ease of adhesion of the wet substrate.
Home-applied waterproof material coatings use water as a dispersant to solve the environmental pollution caused by the use of solvent-based waterproof coatings such as tar and asphalt, as well as harm to the human body, so consumers can purchase products they want without worry.
Petroleum Resin (Hydrocarbon resin) is a kind of thermal plasticizing hydrocarbon resin produced by C5, C9 fraction.It is not a high polymer but a low polymer with the molecular weight between 300-3000. Featured by acid value, easy mutual solubilities, resistant to water, resistant to ethanol and chemicals.
Generally, the petroleum resins are not used independently, but have to be used together with other kinds of resins as promoters, adjusting agents and modifiers in hot-melt adhesive, pressure-sensitive adhesive, hot melt road marking paint, rubber tires and so on.
Petroleum Resin, Aliphatic Petroleum Resin, Petroleum Resin Adhesive, Petroleum Resin Paint Coating
Eva Resin,Hydrogenated Hydrocarbon Resin Co., Ltd. http://www.hnironoxide.com