Method for preparing hard polyvinyl chloride plastic toughening and reinforcing agent

Abstract

The invention discloses a method for preparing a hard polyvinyl chloride plastic toughening and reinforcing agent. The method mainly comprises the following steps: (1) preparation and ultrasonic auxiliary dispersion for inorganic powder slurry, namely mixing inorganic mineral powder calcium carbonate (or calcium sulfate, talc powder, mica powder or kaolin) and ethylene glycol methyl ether solvent, and heating, stirring and ultrasonically dispersing the mixed slurry to obtain powder slurry; (2) coupling modification for inorganic mineral powder, wherein a silane coupling agent adopted by the coupling modification is one of vinyl triethoxy silane and vinyl trimethoxy silane; (3) multilayer modification for organic monomers of the inorganic mineral powder, wherein a soft organic monomer adopted by the inorganic mineral powder modification is one of ethyl acrylate, butyl acrylate and ethyl hexyl acrylate; and a hard organic monomer is one of styrene, methyl methacrylate and vinyl acetate, acrylonitrile and acrylic amide; and (4) post treatment for the modified powder. The method is suitable for preparing the hard polyvinyl chloride plastic toughening and reinforcing agent.

Description

Technical field [0001] The invention relates to a preparation method of a toughening and strengthening agent for rigid polyvinyl chloride plastic, belonging to the technical field of new materials and chemical industry. Background technique [0002] In the process of preparing rigid polyvinyl chloride plastic products, in order to improve the mechanical properties of rigid plastic products, blending modification methods or inorganic powder filling modification methods are used. In order to improve the toughness of rigid plastic products, flexible plastics and rigid plastics are blended and modified to achieve the effect. However, the negative effect is that the tensile strength of rigid plastic products will decrease and the production cost will increase. There are also reports that the use of inexpensive and rigid inorganic particles also has a toughening effect, but its effect is not obvious. In most cases, the increase in tensile strength is more significant. In addition, inor...

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Problems solved by technology

[0004] In addition, the search found that the patent announcement number CN1006892 discloses a rigid polyvinyl chloride toughening method, which is to use non-polar synthetic rubber and polyvinyl chloride mechanical blending method to make rigid polyvinyl chloride tough, although The toughening effect is obvious, but the tensile strength will be reduced and the cost will be higher

Patent announcement number CN1272377 discloses a polyvinyl chloride toughened and reinforced masterbatch and its preparation method and application. The method uses the surface force of a vibrating ball mill to modify the surface of inorganic nanoparticles. The method is dusty and the toughening effect Not obvious

Patent Publication No. CN101362835 discloses a surface treatment method of magnesium hydroxide flame retardant. The method is to mix the silane coupling agent solution and the magnesium hydroxide slurry, stir and modify at a certain temperature, and modify according to this method Magnesium hydroxide is mainly used as a combustion aid for polymer materials, and the modification effect is poor

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