Comprehensive analysis of PVC light calcium enhancement technology
The use of specially treated light calcium carbonate in rigid PVC profiles, pipes and other products, so that the polyvinyl chloride macromolecules under the multiple action of light calcium carbonate powder, in the process of extrusion processing cooling, through reasonable The new stacking, hollowing out and networking, can fundamentally improve the performance of composite materials. This scientific and technological achievement has been invented by Dr. Zhong Mengguang, the general manager of Shanghai Zhehua Chemical Materials Co., Ltd., and has begun industrialization.
It is characterized in that 10 to 30 parts of specially treated light calcium carbonate are added to the original formula, the relative density of the composite material is not improved, and the tensile strength, bending strength (rigidity) and impact strength (toughness) are not lowered, and even There is an upgrade that breaks through the technical barrier of filling plastics in the past.
The research results adopt a completely different idea from the traditional modification theory, and establish a new interface chemical design theory with surface deposition chemistry, metal organic complex chemistry and surface polymerization theory as the main features, according to the short-range and remote structure of polymer materials. , crystalline structure, aggregation state characteristics, careful design of the existence of powder materials in polyvinyl chloride plastics, but also through this powder material to change the spatial shape of polychlorovinyl plastic macromolecules and between each other Combined with the state, the goal of "relative density does not increase, performance does not fall, production efficiency does not decrease, and economic benefits are significantly improved" is achieved.
In addition, the company has also developed a type II specially treated light calcium carbonate, which can be used to increase the relative density of the filler material by using 50 phr (filling amount) of active calcium carbonate. Under constant conditions, tensile strength, flexural modulus and low-temperature notched impact strength are simultaneously improved, demonstrating the advancement and superiority of this technology.
Since the three mechanical properties are simultaneously improved and the relative density of the filler material is not increased, it can bring huge economic benefits to the downstream enterprises to use the new powder material. At the same time, in terms of effective use of resources, since a large amount of petroleum-based synthetic resin can be saved, according to the current annual output of more than 2 million tons of PVC profiles and pipes, such as the special treatment of light calcium carbonate is added on average. The amount is 25%, which can save hundreds of tons of oil every year.
In addition, we should pay attention to the use of recycled materials. For this kind of one or several times, there is no impurity, and there is no decomposition of aBS re-biological. Like this kind of aBS plastic, it is generally not related to other new materials. Mixed together, the purpose is to prevent chromatic aberration.
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