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A method of mixing stmma and eps to make disappearing formwork materials

A lost foam and material mixing technology, which is used in casting and molding equipment, household appliances, other household appliances, etc., can solve the problems of dimensional deformation, slag inclusion, casting pouring back spray, etc., and achieves less gasification residue and gasification rate. Fast and cost-effective effects

Active Publication Date: 2018-10-26
KOCEL EQUIP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Track the pattern quality of different bead ratios and the problems of backspray, slag inclusion and dimensional deformation of castings during the whole process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] (1) Material selection: select styrene and methyl methacrylate copolymer (STMMA) with a particle size of 0.6-0.9mm and an expansion ratio of 75-80; a particle size of 0.7-1.1mm and an expansion ratio of 65- 70 times of styrene polymer (EPS), the two are mixed in a weight ratio of 5:1;

[0041] (2) Pre-expanding: After mixing and stirring the above two materials, use an intermittent pre-expanding machine to pre-expand the beads. The bubble temperature is 99°C;

[0042] (3) Curing: the temperature is controlled at 23°C, and the curing time is 24 hours;

[0043] (4) Plate forming: the steam pressure of the main line is 0.7MPa, the primary penetration pressure is 0.10MPa, the secondary penetration pressure is 0.07MPa, and the temperature is controlled at 105°C for plate forming.

[0044] The indicators of the plate produced by this technical scheme are:

[0045] project

Embodiment 2

[0047] (1) Material selection: select styrene and methyl methacrylate copolymer (STMMA) with a particle size of 0.6-0.9mm and a foaming ratio of 75-80 times; a particle size of 0.7-1.1mm and a foaming ratio of 65 -70 styrene polymer (EPS), the two are mixed in a volume-to-weight ratio of 1:5;

[0048] (2) Pre-expanding: After the above two materials are mixed and stirred evenly, the beads are pre-expanded using an intermittent pre-expanding machine. The bubble temperature is 95°C;

[0049] (3) Curing: the temperature is controlled at 25°C, and the curing time is 22 hours;

[0050](4) Plate forming: the steam pressure of the main line is 0.8MPa; the primary penetration pressure is 0.12MPa, the secondary penetration pressure is 0.075MPa, and the temperature is controlled at 100°C for plate forming.

[0051] The indicators of the plate produced by this technical scheme are:

[0052] project

Embodiment 3

[0054] (1) Material selection: select styrene and methyl methacrylate copolymer (STMMA) with a particle size of 0.6-0.9mm and an expansion ratio of 75-80; a particle size of 0.7-1.1mm and an expansion ratio of 65- 70 times of styrene polymer (STMMA), the two are mixed in a weight ratio of 2:1;

[0055] (2) Pre-expanding: After mixing and stirring the above two materials, use an intermittent pre-expanding machine to pre-expand the beads. The bubble temperature is 97°C;

[0056] (3) Curing: the temperature is controlled at 24°C, and the curing time is 23 hours;

[0057] (4) Plate forming: the steam pressure of the main line is 0.75MPa, the primary penetration pressure is 0.11MPa, the secondary penetration pressure is 0.07MPa, and the temperature is controlled at 103°C for plate forming.

[0058] The indicators of the plate produced by this technical scheme are:

[0059] project

[0060] The model plate produced by the proportioned mixture of the present invention ha...

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Abstract

The invention provides a method for manufacturing a lost foam casting plate through a styrene and methyl methacrylate copolymer (STMMA) and expandable polystyrene polymer (EPS) mixed material. The method comprises the following steps of material selecting, wherein a styrene and methyl methacrylate copolymer with the particle diameter ranging from 0.6 mm to 0.9 mm and the foaming ratio ranging from 75 to 80 times and an expandable polystyrene polymer with the particle diameter ranging from 0.7 mm to 1.1 mm and the foaming ratio ranging from 65 to 70 times are selected, and the styrene and methyl methacrylate copolymer and the expandable polystyrene polymer are mixed according to the weight ratio of 1:5-5:1 to be foamed; pre-foaming, wherein after the two above materials are mixed and stirred to be uniform, an intermittent pre-foaming machine is used for bead pre-foaming, the pre-foaming steam pressure is controlled to range from 0.025 MPa to 0.04 MPa, and the foaming temperature ranges from 90 DEG C to 105 DEG C; curing, wherein the curing temperature is controlled to range from 21 DEG C to 25 DEG C, and the curing time ranges from 12 h to 36 h; and plate forming, wherein plate forming is carried out under the conditions that the steam pressure ranges from 0.65 MPa to 0.8 MPa, the primary penetrating pressure ranges from 0.07 MPa to 0.12 MPa, the secondary penetrating pressure ranges from 0.06 MPa to 0.08 MPa, and the temperature is controlled to range from 95 DEG C to 115 DEG C.

Description

technical field [0001] The present invention relates to a method for making a formwork material, and more particularly, to a method for making a foam plate for full-shape, negative-pressure lost-foam casting. Background technique [0002] Bead raw materials for making disappearing formwork materials include EPS, STMMA, and EPMMA. Among them, EPS (styrene polymer) is cheap and widely used, but it is not easy to gasify, and castings are prone to slag inclusion; STMMA (styrene and methyl methacrylate copolymer) is more expensive, has a large amount of gas generation, and is easy to gasify. The risk of slag inclusion in castings is low, and the machined surface quality is good; EPMMA (methyl methacrylate polymer) is expensive and less used in lost foam casting. [0003] The quality of the lost foam pattern is the most critical factor for the success of lost foam casting. One of the sources of the solid / negative pressure lost foam casting pattern is the processing of the sheet ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22C7/02B29C44/60B29C44/02B29K25/00B29L31/00
CPCB22C7/023B29C44/02B29C44/60B29K2025/04B29K2025/08B29L2031/757
Inventor 朱文文原晓雷薛蕊莉杨争光
Owner KOCEL EQUIP
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