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Expandable gasification mould material for lost foam casting and preparation method of expandable gasification mould material

A technology of lost foam casting and expandability, which is applied in the direction of casting and molding equipment, which can solve the problems of waste of water resources, environment and pollution, and achieve the effect of reducing material cost, reducing environmental pollution and increasing foaming ratio

Inactive Publication Date: 2019-10-15
波尔玛(辛集)保温材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide an expandable gasification mold material for lost foam casting and its preparation method. The problem of environmental pollution

Method used

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  • Expandable gasification mould material for lost foam casting and preparation method of expandable gasification mould material

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preparation example Construction

[0031] A method for preparing an expandable gasification mold material for lost foam casting, comprising the following steps: first, high molecular weight polystyrene, polymethyl methacrylate, ultra-high molecular weight polyethylene, functional monomer methacrylic acid, heat The decomposing accelerator, nucleating agent, and antistatic agent are uniformly mixed with a high-speed mixer, and then extruded and rotary-cut into bead materials by extrusion granulation equipment. Foaming agent, the prepared bead material is dried and sieved, and finally the surface coating agent is wrapped outside the bead material to obtain the expandable gasification mold bead material; the specific ratio of the added materials by weight is:

[0032] 10-50 parts of high molecular weight polystyrene, 50-90 parts of polymethyl methacrylate, 1-5 parts of functional monomer methacrylic acid, 1-20 parts of ultra-high molecular weight polyethylene, 0.1-2 parts of pyrolysis accelerator , 0.1-0.5 part of ...

Embodiment 1

[0034] Adopt following raw material (weight parts):

[0035] (1) 25 parts of high molecular weight polystyrene; 80 parts of polymethyl methacrylate; 1 part of functional monomer methacrylic acid; 3 parts of ultra-high molecular weight polyethylene; 3 parts of pyrolysis accelerator-tetrabromocyclooctane; Nucleating agent-polyethylene wax 0.5 parts; static prevention agent-octadecyl dimethyl hydroxyethyl quaternary ammonium nitrate 0.02 parts; foaming agent-pentane 4 parts; foaming aid-CO 2 0.3 parts; surface coating agent-zinc stearate 0.3 parts. (2) Dry the high-molecular-weight polystyrene, polymethyl methacrylate, and ultra-high-molecular-weight polyethylene in the above-mentioned parts by weight in a vacuum oven at 110°C for 2 hours. After drying, take them out and put them into a high-speed mixer and heat them to 155°C. , then add functional monomer methacrylic acid, tetrabromocyclooctane, polyethylene wax, octadecyl dimethyl hydroxyethyl quaternary ammonium nitrate and m...

Embodiment 2

[0038] Adopt the following raw materials (weight parts):

[0039] (1) 18 parts of high molecular weight polystyrene; 75 parts of polymethyl methacrylate; 3 parts of ultra-high molecular weight polyethylene; pyrolysis accelerator-4 parts of hexabromocyclododecane; nucleating agent-talc powder 0.6 parts ; Static antistatic agent - condensation product of alkylamine and ethylene oxide 0.02 parts; Foaming agent - 4 parts of pentane; Foaming aid - CO 2 0.4 parts; surface coating agent-glyceryl monostearate 0.25 parts. (2) Dry the high-molecular-weight polystyrene, polymethyl methacrylate, and ultra-high-molecular-weight polyethylene in the above-mentioned parts by weight in a vacuum oven at 110°C for 2 hours. After drying, take them out and put them into a high-speed mixer and heat them to 155°C. , then add the functional monomer methacrylic acid, hexabromocyclododecane, talc powder, alkylamine and ethylene oxide condensate and mix evenly, then put it into the twin-screw extruder,...

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Abstract

The invention relates to the technical field of lost foam casting materials, in particular to an expandable gasification mould material for lost foam casting and a preparation method of the expandablegasification mould material. According to the expandable gasification mould material for lost foam casting, high molecular weight polystyrene and polymethyl methacrylate are blended, ultra-high molecular weight polyethylene, functional methacrylic acid monomers and an additive are introduced, a foaming agent and a foaming promoter are injected in an extrusion process, and the expandable gasification mould material for lost foam casting with improved performance is obtained. The volume weight of the obtained material is low, the foaming rate reaches 90 times, the compression strength is high,the gas generation amount is small, and the carbon content per unit mass is about 30% less than the carbon content per unit mass of EPS polymer produced by a suspension polymerization method. The expandable gasification mould material for lost foam casting is prepared by a raw material blending, screw extrusion, rotary cutting and granulation process, the problems of large water consumption and high wastewater treatment difficulty in a process of producing an expandable gasification mould material by a suspension polymerization method are solved, and environmental pollution is relieved.

Description

technical field [0001] The invention relates to the technical field of lost foam casting materials, in particular to an expandable gasification mold material for lost foam casting and a preparation method thereof. Background technique [0002] Lost foam casting technology can realize precision, high efficiency, batch and clean production. To obtain qualified castings, it is necessary to use high-quality gasification mold materials. [0003] At present, the vaporized mold materials that have been applied to lost foam casting include expandable polystyrene (EPS), expandable polymethyl methacrylate (EPMMA), and styrene-methyl methacrylate copolymer (STMMA). , the above several materials are all obtained by monomers through water-emulsion suspension polymerization, and the expandable polymer formed by suspension polymerization has the following defects: 1. The particle size of the polymer beads is small, and the low molecular weight causes the density of the pattern material to...

Claims

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Application Information

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IPC IPC(8): C08L33/12C08L25/06C08L23/06C08K5/19C08K5/02C08K5/098C08J9/14B22C7/02
CPCB22C7/023C08J9/141C08J2203/14C08J2333/12C08J2425/06C08K5/02C08K5/098C08K5/19
Inventor 郭醒刁松
Owner 波尔玛(辛集)保温材料有限公司