Preparation method of low-molecular-plasticizer-free nontoxic soft PVC (polyvinyl chloride) composite

A technology of plasticizer and compound, applied in the field of preparation of soft PVC compound, can solve problems such as poor compatibility and environmental pollution, and achieve the effect of improving compatibility

Active Publication Date: 2015-07-15
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to address the migration and exudation of plasticizers during the use of soft PVC products, the environmental pollution caused by the volatilization of solvent oil in the production of soft PVC, and the poor compatibility between traditional acrylic copolymers and PVC. , to provide a preparation method of non-toxic soft PVC compound without low molecular weight plasticizer

Method used

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  • Preparation method of low-molecular-plasticizer-free nontoxic soft PVC (polyvinyl chloride) composite
  • Preparation method of low-molecular-plasticizer-free nontoxic soft PVC (polyvinyl chloride) composite
  • Preparation method of low-molecular-plasticizer-free nontoxic soft PVC (polyvinyl chloride) composite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment example 1

[0043] (1) Preparation of polyacrylate seed latex

[0044] Add 300.0ml deionized water, 1.0g emulsifier SDS to the four-necked reaction flask equipped with reflux condenser, stirring, thermometer and nitrogen inlet, pass nitrogen at room temperature and stir for 0.5 hours, then start the water bath to heat up, when the system temperature A blend of 38.0 g of seed monomer butyl acrylate (BA) and 2.0 g of 2-ethylhexyl acrylate (EHA) and 0.5 g of cross-linking agent BDDA were added to reach 40°C. When the system temperature reached 65° C., 0.6 g of initiator potassium persulfate was added. At the beginning of the reaction, the system exothermicly increased in temperature. When the temperature of the reaction solution was constant to 70°C, the reaction was kept for 1.5 hours. After the heat preservation finishes, add emulsifier SDS 1.0g, add dropwise the mixed solution (95.0g BA, 5.0g EHA, 1.2gBDDA) of the core layer monomer and the core layer cross-linking agent in the system a...

Embodiment example 2-5

[0057] Change the add-on of methylvinyldiethoxysilane in step (2) to be 0.25g, 0.4g, 0.6g, 0.75g, and all the other implementation processes are the same as implementation case 1, the PVC particles prepared by implementation case 2-5 The SEM photos of the morphology are attached Figure 4-7 .

[0058] attached by figure 1 , 4 , 5, 6, 7 It can be seen that with the increase of the amount of methylvinyldiethoxysilane added, the flower structure on the surface of PVC particles gradually becomes more obvious, and the particles gradually become more uniform.

Embodiment example 6

[0060] Change the BA addition in the implementation case 1 step (3) to 7.5g, and all the other implementation processes are the same as the implementation case 1. The SEM photo of the prepared PBA / PVC-sg-PBA composite particles is shown in the attached Figure 8 .

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Abstract

The invention relates to a preparation method of a low-molecular-plasticizer-free nontoxic soft PVC (polyvinyl chloride) composite, which comprises the following steps: preparing a polyacrylate seed latex by emulsion polymerization, grafting PVC by seed emulsion polymerization to synthesize the flower-structure core-shell PVC latex, carrying out graft copolymerization on the acrylate monomer to the flower-structure PVC latex in a swelling mode by seed emulsion polymerization, and plastifying to obtain the low-molecular-plasticizer-free nontoxic soft PVC. The solvent in the preparation process is water, so the problem of environmental pollution due to solvent volatilization can not occur in the soft PVC preparation process. The soft PVC is free of any plasticizer, and thus, has the characteristic of no toxicity. The PVC and polyacrylate polymer are combined in the form of chemical bond, so the PVC product can not have the problem of micromolecule migration and seepage in the use process, and the properties of the product can not be lowered along with service time.

Description

Technical field: [0001] The invention belongs to a preparation method of non-toxic soft polyvinyl chloride, in particular to a preparation method of non-toxic soft PVC compound without low-molecular plasticizer. technical background: [0002] Polyvinyl chloride (PVC) plastic is the second largest general-purpose plastic in the world. Because of its excellent mechanical properties, flame retardancy, wear resistance, electrical insulation, and chemical corrosion resistance, it plays an extremely important role in the development of the national economy. role. Using polyvinyl chloride resin as raw material and adding different additives, it can be processed into products with different properties to meet the actual use requirements. According to the amount of plasticizer added, it is usually divided into soft, semi-rigid and rigid PVC materials. Soft PVC can be used in medical equipment, toys, food packaging, wire and cable materials and other fields, but due to the addition ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F285/00C08F220/16C08F220/18C08F220/28
Inventor 潘明旺常燕宁袁金凤张广林王丽霞汪洋
Owner HEBEI UNIV OF TECH
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