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Industrial preparation method of PVC processing aid

An emulsification pump and coating technology, which is applied in the field of industrial preparation of polymer-coated inorganic nano-powders, can solve the problems of not meeting the original particles, coating treatment requirements, complex process, etc., to reduce cohesion and enhance compatibility Sexuality, the effect of reducing dosage

Inactive Publication Date: 2009-03-25
上海卓越纳米新材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to overcome the severe particle agglomeration in the dry polymerization process of nano-calcium carbonate in the prior art, the surface coating treatment requirements of the primary particles cannot be reached, while in the wet emulsion polymerization process, it needs to be carried out in a polymerization reactor, and The process is complicated, and it is difficult to carry out defects in the existing calcium carbonate synthesis kettle

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] In the coating still of 30 cubic meters, adding concentration is that 8% (weight concentration) carbonized to PH equals 25 cubic meters of nano-calcium carbonate slurry of 6.5-7, the particle diameter of nano-calcium carbonate is 40-70nm, in Add 1.5 tons of polymethacrylate high polymer emulsion with a solid content of 30% under the stirring of a high-shear emulsification pump, heat up to 75°C, and cover at a constant temperature for 2 hours under strong shear emulsification. Filter and dry at 105°C to obtain polymethacrylate-coated nano-calcium carbonate powder with a core-shell polymer structure. According to the Shanghai Enterprise Standard (Q / IMOK01-2007), the product has an average particle size of 65nm, a whiteness of 93, an oil absorption value of 18, a polymer coating of 19.5%, and no agglomeration. The product of the invention can partially replace CPE in the process of making PVC, and the impact strength of PVC is improved and the toughness is better.

Embodiment 2

[0023] In the coating still of 30 cubic meters, adding concentration is that 14% (weight concentration) is equal to 25 cubic meters of nano-calcium carbonate slurry that PH is equal to 6.5-7, and the particle diameter of nano-calcium carbonate is 70-100nm, in Add 3 tons of styrene butyl acrylate polymer emulsion with a solid content of 25% under the stirring of a high-shear emulsification pump, heat up to 80°C, and cover at a constant temperature for 3 hours under strong shear emulsification, and filter the slurry while it is hot , and dried at 105° C. to obtain nano-calcium carbonate powder coated with polystyrene butyl acrylate with a core-shell polymer structure. According to Shanghai Enterprise Standard (Q / IMOK01-2007), the product has an average particle size of 90nm, a whiteness of 93.3, an oil absorption value of 19.2, a polymer coating of 17.1%, and no agglomeration. In the process of making the PVC product of the present invention, under the same formula, adding 4% of...

Embodiment 3

[0025] In the coating still of 30 cubic meters, adding concentration is that 11% (weight concentration) is equal to 25 cubic meters of the nano-calcium carbonate slurry that PH is equal to 6.5-7, and the particle diameter of nano-calcium carbonate is 50-70nm, in Under the agitation of the high-shear emulsification pump, add 1.5 tons of styrene butyl acrylate polymer emulsion with a solid content of 25%, and then add 1 ton of vinyl acetate homo / copolymer emulsion with a solid content of 31%, and heat up to 85°C. Coated at constant temperature for 2.5 hours under shear emulsification, filtered the slurry while it was hot, and dried at 105°C to obtain nano calcium carbonate powder coated with polystyrene butyl acrylate and vinyl acetate homo / copolymer with a core-shell polymer structure body. According to Shanghai Enterprise Standard (Q / IMOK01-2007), the product has an average particle size of 65nm, a whiteness of 93.1, an oil absorption value of 17.9, a polymer coating of 25.1%,...

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Abstract

The invention discloses an industrialized preparation method of polymer-coated inorganic nano calcium carbonate with the structure of core-shell polymerization. A principle thereof is that carbonized nano calcium carbonate is adopted as a core and polymer emulsion is adopted as a shell to be compounded into the core-shell polymer structure, and primary particles of the nano calcium carbonate are evenly coated with high polymers. The preparation method has the main steps that commercial polymer emulsion is added into the synthesized sizing agent of the nano calcium carbonate, the dispersing and surface coating of the nano calcium carbonate are synchronously finished under the action of the high shearing force of an emulsification pump, and finally, products of the invention are obtained after filtration and drying. The products can replace CPE and be adopted as a processing agent for enhancing flexibility and strength during the processing of PVC.

Description

technical field [0001] The invention relates to an industrialized preparation method of a PVC processing aid, in particular to an industrialized preparation method of a polymer-coated inorganic nanometer powder with a core-shell polymerization structure. Background technique [0002] PVC is a general-purpose plastic with a wide range of uses. PVC is the abbreviation of polyvinyl chloride material. It is made of polyvinyl chloride resin as the main raw material, adding an appropriate amount of anti-aging agent, modifier, etc. Materials made by other processes. PVC material has the characteristics of light weight, heat insulation, heat preservation, moisture resistance, flame retardancy, and simple construction. It has various specifications, colors, and patterns, and is very decorative. Its average consumption is second only to polyethylene. In the past, in the processing of PVC, in order to reduce the production cost and improve the dimensional stability and impact strength...

Claims

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Application Information

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IPC IPC(8): C08K9/10C08L27/06
Inventor 顾达姚成邓丽丽
Owner 上海卓越纳米新材料股份有限公司
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