Preparation method of spherical particles of thermoplastic plastic

A technology for thermoplastics and spherical particles, which is applied in the field of preparation of thermoplastic spherical particles, and can solve problems such as low economic efficiency

Active Publication Date: 2013-12-25
张兴华 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These methods all encounter the problem of batch prepa...

Method used

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  • Preparation method of spherical particles of thermoplastic plastic
  • Preparation method of spherical particles of thermoplastic plastic
  • Preparation method of spherical particles of thermoplastic plastic

Examples

Experimental program
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Effect test

Embodiment 1

[0020] Put 100g of crushed LDPE (low-density polyethylene) powder in a 1000ml flask, add 500ml of xylene and 2ml of OP-10 (alkylphenol polyoxyethylene ether), fully stir and disperse, heat to 90°C, and keep warm for about 4 hours After cooling, filter, wash, dry, pulverize and sieve to obtain spherical LDPE powder. The product properties are shown in Table 1.

Embodiment 2

[0022] Put 20g of pulverized HDPE (high-density polyethylene) powder, 1.5g of stearic acid, 1ml of cyclohexane and 250ml of water in a 500ml autoclave, stir and disperse evenly, then heat to 128°C, and the pressure in the autoclave is 0.19MPa , Cool after 4 hours, take out the mixed liquid from the kettle, filter, wash, dry, pulverize and sieve to obtain the product. The product properties are shown in Table 1.

Embodiment 3

[0024] Put 25g of crushed PVC (polyvinyl chloride) powder, 250ml of water, 1g of polyvinyl alcohol (1799) and 8.3ml of cyclohexanone in a 500ml autoclave, disperse evenly, heat to 135°C, and then The pressure is 0.20 MPa. After 3 hours, cool down, take out the mixed liquid from the kettle, filter, wash, dry, pulverize and sieve to obtain the product. The product properties are shown in Table 1.

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Abstract

The invention relates to a preparation method of spherical particles of a thermoplastic plastic. The method comprises the following steps: S1, mixing thermoplastic plastic powder, a deformation assistant and a surface protection stabilizer to obtain a raw material mixture; S2, adding the raw material mixture into a dispersing medium and heating, then, separating the heated mixture, washing the filter residue and drying, and finally crushing the filter residue and sieving to obtain the spherical particles of a thermoplastic plastic. The particles prepared by the method provided by the invention are better in degree of sphericity, and have the characteristics of wide application range and no limit by types of plastic (polymers). Appropriate deformation assistants, surface protection stabilizers and operating conditions can be found for nearly all thermoplastic polymers to obtain the spherical particles. The spherical particles have less influence on property of the material such as molecular weight, component distribution and melt fluidity.

Description

technical field [0001] The invention relates to the technical field of thermoplastic powder preparation, in particular to a preparation method of thermoplastic spherical particles. Background technique [0002] Thermoplastic powders with ultra-micron diameter and spherical particles have a wide range of uses, such as coatings, selective laser sintering rapid prototyping, cosmetics, drug carriers, and medical tracer material carriers. Compared with irregularly shaped particles, spherical particles have regular shapes and have many advantages, such as low friction coefficient, high bulk density, low specific surface area, etc. In addition, they will not have a significant impact on the flow properties of liquids in liquids. It is not easy to stay in the dead corner of flow, and has excellent rheological properties. [0003] The existing methods for preparing spherical thermoplastic particles can be spherical during the polymerization process, such as by emulsion polymerizatio...

Claims

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Application Information

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IPC IPC(8): C08L23/06C08L27/06C08L25/06C08L23/12C08L67/02C08L69/00C08L77/06C08L33/12C08L59/04
Inventor 张兴华冯涛童速玲孙建民马金玲
Owner 张兴华
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