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Modified gypsum-based whisker for reinforcing and toughening plastic and preparation method thereof based on emulsion polymerization

A technology of strengthening and toughening and emulsion polymerization, which is applied in the field of chemical preparation, can solve the problems of reducing the strength of PVC products, poor impact resistance, and high cost, and achieve the effects of reducing modification costs, good processing performance, and low cost

Inactive Publication Date: 2017-11-14
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But at present, compared with other functional fillers, domestic CPE has poor modification effect, high cost, poor impact resistance, and will reduce the strength of PVC products.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039]A modified gypsum-based whisker for strengthening and toughening plastics, with a core-shell structure with calcium sulfate whisker as the core and polybutylmethacrylate elastomer as the outer coating layer, which can be used for functional modification of PVC sex.

[0040] The α-calcium sulfate hemihydrate whiskers used in this example have a diameter of 5-10 μm and an aspect ratio of 1-6. The preparation method is as follows: respectively prepare a NaCl solution with a concentration of 30wt% and 20wt% and K with a concentration of 20wt%. 2 SO 4 Solution, the two are mixed by volume ratio 3:1 and then poured into the reactor; then add phosphogypsum and crystal form regulator (the mixture of sodium citrate and sodium gluconate, sodium citrate and sodium gluconate The mass ratio range is controlled at 2:1), the reaction temperature is set at 95°C, heated in a water bath, and after constant temperature reaction for 5 hours, suction filtration while hot, and the filter cak...

Embodiment 2

[0049] A modified gypsum-based whisker for strengthening and toughening plastics, with a core-shell structure with calcium sulfate whisker as the core and polybutylmethacrylate elastomer as the outer coating layer, which can be used for functional modification of PVC sex.

[0050] The α-calcium sulfate hemihydrate whiskers used in this example have a diameter of 4-8 μm and an aspect ratio of 2-8. The preparation method is as follows: respectively prepare a NaCl solution with a concentration of 25 wt%, and a CaCl solution with a concentration of 25 wt%. 2 Solution, mix the two according to the volume ratio of 3:1 and pour them into the reactor; then add phosphogypsum and crystal form regulator into the reactor, set the reaction temperature to 95°C, heat in a water bath, and react at constant temperature for 5 hours, Suction filtration while hot, dry the filter cake in a vacuum oven, and dry to obtain α-calcium sulfate hemihydrate whiskers. Wherein, the solid-to-liquid mass rat...

Embodiment 3

[0058] A modified gypsum-based whisker for strengthening and toughening plastics, with a core-shell structure with calcium sulfate whisker as the core and polybutylmethacrylate elastomer as the outer coating layer, which can be used for functional modification of PVC sex.

[0059] The α-calcium sulfate hemihydrate whiskers used in this example have a diameter of 3-6 μm and an aspect ratio of 1-9. The preparation method is as follows: respectively prepare a NaCl solution with a concentration of 20 wt%, and a CaCl solution with a concentration of 20 wt%. 2 Solution, mix the two according to the volume ratio of 1:1 and pour into the reactor; then add phosphogypsum and crystal form regulator into the reactor, set the reaction temperature to 95°C, heat in a water bath, and react at constant temperature for 4 hours, Suction filtration while hot, dry the filter cake in a vacuum oven, and dry to obtain α-calcium sulfate hemihydrate whiskers. Wherein, the solid-to-liquid mass ratio of...

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Abstract

The invention discloses modified gypsum-based whisker for reinforcing and toughening plastic. A core-shell structure taking calcium sulfate whisker as a core and an elastomer as an outer coating layer can be applied to functional modification of plastic. According to the modified gypsum-based whisker disclosed by the invention, the calcium sulfate whisker is pretreated first, and the problem that whisker loses water and is disintegrated in a high-temperature extrusion process is effectively solved; then an elastomer is generated by an in-situ emulsion polymerization technology, and the surface of the calcium sulfate whisker is coated to form a core / shell structure taking calcium sulfate hemihydrate whisker as a core and the elastomer as a shell; the core / shell structure is used for modifying a PVC (Polyvinyl Chloride) hard material, and a good effect of reinforcing and toughening is realized obviously.

Description

technical field [0001] The invention relates to a modified gypsum-based whisker for reinforcing and toughening plastics and a preparation method based on emulsion polymerization, and belongs to the technical field of phosphorus chemical preparation. Background technique [0002] Polyvinyl chloride (PVC for short) resin is a thermoplastic polymer compound polymerized from vinyl chloride (VC for short) monomer. [0003] According to Vincent's polymer brittleness-ductile fracture theory, PVC belongs to the category of brittle materials, and the brittleness of PVC materials seriously restricts its production and application. Therefore, the research on toughening and modification of PVC materials is an urgent problem to be solved in the field of industrial applications. , It is also an inevitable requirement for the preparation of high-performance PVC composite materials. In addition, due to some defects of PVC resin, generally it cannot be directly used in production, and corre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F292/00C08F220/18C08F2/26C08K9/06C08K9/10C08L27/06C08L51/10
CPCC08F2/26C08F292/00C08K9/06C08K9/10C08L27/06C08L51/10C08F220/1804
Inventor 黄健朱杨马保国李相国蹇守卫谭洪波
Owner WUHAN UNIV OF TECH
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