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Special modified expandable polystyrene copolymer particles for lost foam and production method for copolymer particles

A technology of expandable polystyrene and lost foam, which is applied in the direction of casting molding equipment, manufacturing tools, cores, etc., can solve the problems of low strength and rigidity, low molecular weight, etc., to shorten the production process, increase molecular weight, The effect of reducing production costs

Active Publication Date: 2015-07-29
ZHEJIANG CASTCHEM NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The second purpose of the present invention is to solve the problem that the molecular weight of the existing EPS is too low, and the strength and rigidity are not high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] (Parts by weight) Take 120 parts of water, 95 parts of styrene, 5 parts of methyl methacrylate, 1 part of suspending agent, 0.01 part of anionic surfactant; 0.2 part of benzoyl peroxide; 0.1 part of nucleating agent; 0.3 0.2 parts of dicumyl peroxide; 0.1 parts of tert-butyl peroxybenzoate; 0.05 parts of molecular weight regulator. Then add water, suspending agent, surfactant, styrene, methyl methacrylate, benzoyl peroxide, nucleating agent, organic bromine, dicumyl peroxide, tert-benzoyl peroxide After capping with butyl ester, mix well.

[0035] After that, the reactor was heated at a heating rate of 0.5° C. / min, and when the temperature rose to 83° C., the temperature was kept constant for 400 minutes.

[0036] Then, after sealing the lid, replace it with nitrogen three times, and press in 6 parts of blowing agent.

[0037] Afterwards, the reactor was heated at a heating rate of 0.5°C / min, so that the reaction temperature reached 120°C and the pressure reached 0.65...

Embodiment 2

[0042] (Parts by weight) Take 110 parts of water, 90 parts of styrene, 5 parts of methyl methacrylate, 1.5 parts of suspending agent, 0.02 part of anionic surfactant; 0.3 part of benzoyl peroxide; 0.2 part of nucleating agent; 0.4 0.3 parts of dicumyl peroxide; 0.2 parts of tert-butyl peroxybenzoate and 0.08 parts of molecular weight regulator. Then add water, suspending agent, surfactant, styrene, methyl methacrylate, benzoyl peroxide, nucleating agent, organic bromine, dicumyl peroxide, tert-butyl peroxide benzoate in sequence in the reaction kettle Mix well after ester capping.

[0043] Afterwards, the reactor was heated at a heating rate of 0.6° C. / min, and when the temperature rose to 85° C., the temperature was kept constant for 480 minutes.

[0044] Then, after capping, replace with nitrogen three times, and press into 5 parts of blowing agent.

[0045] Afterwards, the reactor was heated at a heating rate of 0.6° C. / min, so that the reaction temperature reached 125...

Embodiment 3

[0050] (Parts by weight) Take 110 parts of water, 90 parts of styrene, 3 parts of methyl methacrylate, 1.5 parts of suspending agent, 0.02 part of anionic surfactant; 0.3 part of benzoyl peroxide; 0.2 part of nucleating agent; 0.4 0.3 parts of dicumyl peroxide; 0.2 parts of tert-butyl peroxybenzoate and 0.01 parts of molecular weight regulator. Then add water, suspending agent, surfactant, styrene, methyl methacrylate, benzoyl peroxide, nucleating agent, organic bromine, dicumyl peroxide, tert-butyl peroxide benzoate in sequence in the reaction kettle Mix well after ester capping.

[0051] Afterwards, the reactor was heated at a heating rate of 0.4°C / min, and when the temperature rose to 85°C, the temperature was kept constant for 510 minutes.

[0052] Then, after capping, it was replaced with nitrogen three times, and 10 parts of foaming agent was pressed in.

[0053] Afterwards, the reactor was heated at a heating rate of 0.4° C. / min, so that the reaction temperature re...

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Abstract

The invention discloses special modified expandable polystyrene copolymer particles for lost foam. The modified expandable polystyrene copolymer particles comprise the following components in parts by weight: 90-100 parts of styrene, 3-8 parts of methyl methacrylate, 100-140 parts of de-ionized water, 0.2-0.5 parts of benzoyl peroxide, 0.2-0.5 parts of dicumyl peroxide, 0.1-0.5 parts of tert-butyl peroxybenzoate, 0.001-0.01 parts of an anionic surfactant, 1-2 parts of a suspending agent, 5.0-10.0 parts of a foaming agent, 0.1-0.4 parts of a nucleating agent, 0.2-2 parts of organic bromine, 0.01-0.1 parts of a molecular weight modifier with an effect of increasing molecular weight and 0.3-0.5 parts of a surface coating agent. The special modified expandable polystyrene copolymer particles for the lost foam and a production method for the copolymer particles effectively solve a problem of no special EPS (expandable polystyrene) for lost foam costing at present and have the advantages of capabilities of reducing carbon defects of castings during casting and increasing the molecular weight.

Description

technical field [0001] The invention relates to the field of lost foam casting materials, more specifically, it relates to a special modified expandable polystyrene copolymer particle for lost foam and a production method thereof. Background technique [0002] Lost foam casting (also known as solid casting) is to bond and combine paraffin or foam models similar in size and shape to castings to form a model cluster. After brushing refractory paint and drying, it is buried in dry quartz sand for vibration molding. Down pouring, the model is vaporized, the liquid metal occupies the position of the model, solidified and cooled to form a new casting method. [0003] Compared with traditional sand casting, lost foam casting has many significant advantages, such as: 1. Lost foam casting does not require parting and core, so it is especially suitable for boxes and shells with complex geometric shapes and difficult to complete by traditional casting. Body castings and bobbin casting...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F212/08C08F220/14C08J9/14B22C1/22
CPCC08J9/0019C08J9/0033C08J9/0061C08J9/14C08J9/149C08J9/224C08J2203/14C08J2203/202C08J2423/02C08J9/20C08J2325/14
Inventor 邹建伟唐锁云陆国华韩晓红
Owner ZHEJIANG CASTCHEM NEW MATERIAL CO LTD
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