Expandable polystyrene resin with ultra-large particle size and method for preparing same

A technology of expandable polystyrene and polystyrene, applied in the direction of layered products, etc., can solve the problems of unsatisfactory customers, uneven quality, technical difficulties, etc., and achieve stable and uniform quality, perfect appearance and broad development prospects Effect

Inactive Publication Date: 2013-02-06
东莞新长桥塑料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the prior art, the expandable polystyrene produced by the suspension polymerization method also has a small amount of raw materials with large particle sizes, but the disadvantages are: 1) The large particle size EPS produced by each reactor The output is very small, and the quality is very uneven; 2) The EPS raw materials with large particle size prepared during the suspension polymerization reaction often have quality problems of flat particles or deformed particles, which cannot meet customer requirements
[0003] Due to the above-mentioned technical difficulties in the preparation of EPS raw materials with super large particle sizes, the price is much higher than that of general EPS raw materials. The ultra-large particle size EPS required by customers in the field will have broad market prospects and create huge economic benefits for enterprises

Method used

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  • Expandable polystyrene resin with ultra-large particle size and method for preparing same
  • Expandable polystyrene resin with ultra-large particle size and method for preparing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] Add 2,500 grams of deionized water and 16 grams of tricalcium phosphate as a dispersant to a 5-liter reactor, start stirring, then raise the temperature to 60°C, add 500 grams of polystyrene seeds with a particle size of 0.3 to 0.5 mm, and then use Slowly add 1,500 grams of styrene monomer, 7 grams of initiator dibenzoyl peroxide, 5 grams of tert-butyl peroxybenzoate, and 2 grams of plasticizer mixed xylene in a dropwise manner. Adding time is controlled within 3 hours. After the styrene monomer is added, continue to heat up to 90°C for low-temperature suspension polymerization. After reacting for 6 hours, add 140 grams of foaming agent and heat up to 125°C for high temperature Polymerization reaction, reaction for 8 hours, the total polymerization reaction time is 14 hours, the pressure is 0.4-0.9MPa, after the reaction is completed, cool the material and transfer it to the middle tank, add hydrochloric acid to adjust the pH value to 4-6, and wash it. Adopt separator d...

Embodiment 2

[0058]Add 2500 grams of deionized water and 18 grams of dispersant tricalcium phosphate into a 5-liter reactor, start stirring, then raise the temperature to 50°C, add 500 grams of polystyrene seeds with a particle size of 0.5-0.8 mm, and then use Slowly add 1,500 grams of styrene monomer, 7 grams of initiator dibenzoyl peroxide, 5 grams of tert-butyl peroxybenzoate, and 1.5 grams of plasticizer mixed xylene, in which the drop of styrene monomer Adding time is controlled within 2.5 hours. After adding styrene monomer, continue to heat up to 90°C for low-temperature suspension polymerization. After reacting for 7 hours, add 150 grams of foaming agent and heat up to 120°C for high temperature Polymerization reaction, reaction for 8 hours, the total polymerization reaction time is 15 hours, the pressure is 0.4~0.9MPa, after the reaction is completed, cool the material and transfer it to the middle tank, add hydrochloric acid to adjust the pH value to 4~6, and wash it. Adopt separ...

Embodiment 3

[0061] Add 2500 grams of deionized water and 18 grams of tricalcium phosphate as a dispersant to a 5-liter reactor, start stirring, then raise the temperature to 50°C, add 500 grams of polystyrene seeds with a particle size of 0.8 to 1.0 mm, and then use Slowly add 1300 grams of styrene monomer, 7 grams of initiator dibenzoyl peroxide, 10 grams of dicumyl peroxide, and 1 gram of mixed xylene as a plasticizer, in which the dropwise addition of styrene monomer The time is controlled within 2 hours. After the styrene monomer is added, continue to heat up to 90°C for low-temperature suspension polymerization. React for 7 hours, then add 150 grams of foaming agent, and heat up to 125°C for high-temperature polymerization Reaction, reaction for 8 hours, the total polymerization reaction time is 15 hours, and the pressure is 0.4-0.9MPa. After the reaction is completed, cool the material and transfer it to the middle tank, add hydrochloric acid to adjust the pH value to 4-6, and wash i...

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Abstract

The invention belongs to the technical field of synthesis of polymer materials and particularly relates to an expandable polystyrene resin with an ultra-large particle size and a method for preparing the expandable polystyrene resin. The foaming-agent free polystyrene particles with the size of 0.2-1.0mm are used as the polystyrene seeds, and the seed polymerization method is adopted to prepare the expandable polystyrene resin with an ultra-large particle size. The product has the advantages of uniform particles, satisfactory appearance and stable and uniform quality and can meet the demand of customers in different fields, thereby having a wide market prospect and creating huge economic benefits for the enterprises.

Description

technical field [0001] The invention relates to the technical field of synthesis of polymer materials, in particular to a super-large particle size expandable polystyrene resin and a preparation method thereof. Background technique [0002] At present, the output of expandable polystyrene (EPS) in China has reached more than 4 million tons per year, and it is widely used in packaging, building materials, fishery, handicrafts and other fields. In these application fields, the required EPS particles The particle size usually ranges from 0.5 to 2.0 mm. However, for fishery, industrial water treatment, deep-sea exploration bases, and marine drifting applications, materials with super-large particle sizes are required. For example, large particle sizes above 2.5 mm can be used. Expanded polystyrene, and requires uniform particle size, stable and uniform quality. In the prior art, the expandable polystyrene produced by the suspension polymerization method also has a small amount ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F257/02C08F2/18C08F4/34C08J9/20B32B33/00
Inventor 曾首元
Owner 东莞新长桥塑料有限公司
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