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Expandable copolymer resin and preparation method thereof

A copolymer resin and modification technology, applied in the field of expandable copolymer resin and its preparation, can solve the problems of wide particle size distribution of beads, difficult wastewater treatment, low strength of model materials, etc. The effect of high yield and high model strength

Inactive Publication Date: 2017-11-10
徐鑫
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0018] The technical problem to be solved by the present invention is to provide a kind of expandable copolymer resin and its preparation method, which can solve the problem of wide particle size distribution, many double ends, low yield of finished product, low molecular weight and low strength of model material in the existing one-step method. , Wastewater treatment is difficult

Method used

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  • Expandable copolymer resin and preparation method thereof
  • Expandable copolymer resin and preparation method thereof
  • Expandable copolymer resin and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] In parts by weight, 100 mixed monomers, 300 deionized water, 0.4 dispersants, 9 foaming agents, 0.3 initiators, and 0.05 modification aids are used. The mixed monomer is composed of styrene (ST) and methyl methacrylate (MMA), ST : MMA = 75 : 25; the blowing agent is C4~C6 low-boiling hydrocarbon compound; the modification additive is polyethylene wax; As the dispersant, an inorganic dispersant active calcium phosphate (TCP) was used.

[0037] Mix deionized water, mixed monomers, dispersants, initiators, and modifying additives to carry out low-temperature polymerization. The polymerization temperature is 80°C. After reaching the specified low-temperature polymerization reaction time of 8 hours, add foaming agent and carry out medium-high temperature reaction. , the reaction temperature is 100°C, the pressure is about 0.4MPa, after reaching the specified reaction time for 8 hours, after cooling to the specified temperature (≤50°C), the centrifugal washing, drying, screen...

Embodiment 2

[0039] ST: MMA=70:30, all the other conditions are identical with embodiment 1.

Embodiment 3

[0041] ST: MMA=65:35, all the other conditions are identical with embodiment 1.

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Abstract

The invention discloses foamable copolymer resin and a preparation method thereof. The one-and-half-step method that polymerization is firstly conducted, and a foaming agent is added in the midway is adopted, therefore, the polymerization inhibition effect of the foaming agent in the early stage of polymerization is avoided, and the average relative molecular weight and the model strength are high; in addition, the polymerization reaction speed is uniform, and particle size distribution is narrow; the product yield is high; wastewater is easy to treat; the surface smoothness and the comprehensive performance of residual carbon are best.

Description

technical field [0001] The invention relates to a expandable copolymer resin and a preparation method thereof, belonging to the field of lost foam casting material manufacturing. Background technique [0002] The lost foam casting technology is to use foam plastic (EPS, STMMA or EPMMA) to make the same structure and size as the casting. After dipping and coating the refractory adhesive coating (for strengthening and smoothing), it is dried and embedded in a special sand box. Modeling, in which the paint plays the role of strengthening and smoothing. After three-dimensional or two-dimensional microseismic vibration and negative pressure compaction, the molten alloy liquid is poured without using mud cores, loose blocks or even risers. A certain negative pressure is maintained throughout the process, so that the pattern is heated, gasified, decomposed and then melted by the alloy. A new process of one-time molding casting with liquid replacement. There are many different nam...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J9/14C08L25/14C08L23/06C08K3/32C08F212/08C08F220/14
CPCC08F212/08C08J9/141C08J2203/14C08J2325/14C08J2423/06C08L25/14C08L2203/14C08F220/14C08L23/06C08K2003/325
Inventor 徐鑫何凯锴
Owner 徐鑫