Expandable copolymer resin for manufacturing lost foam casting model and preparation method thereof
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A technology of expandable copolymer resin and lost foam casting, which is applied in the direction of casting molding equipment, etc., can solve the problems of low pass rate of castings, carbon defects of castings, difficult thermal decomposition, etc., to improve the bonding effect, promote uniform mixing, reduce The effect of carbon defects
Active Publication Date: 2019-09-06
ZHEJIANG CASTCHEM NEW MATERIAL CO LTD
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[0008] However, the synthetic resin foams used in the prior art are polystyrene, polymethyl methacrylate or their copolymers, and the main component of EPS is benzene ring compounds, which are difficult to thermally decompose at high temperatures, but Under the high temperature of molten iron casting, it is easy to decompose and generate tar-like substances, which adhere to the inner surface of the outer coating of the model. Therefore, a large amount of carbon slag is formed at a high temperature above 900°C and adheres to the surface of cast iron and steel, resulting in carbon in the casting. defect phenomenon
As a result, when casting cast iron and steel, the qualified rate of the final castings is low and the quality is poor
Method used
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Embodiment 1
[0060] Embodiment 1: An expandable copolymer resin used to manufacture lost foam casting models, the components included therein and their corresponding qualities are shown in Table 1, and prepared by the following steps:
[0061] Step 1, fully mixing deionized water, cellulose ether dispersant, and sodium salt to form a first mixture;
[0062] Step 2, after fully mixing the mixed monomers, foaming agent, initiator, and molecular weight regulator, a second mixture is obtained;
[0063] Step 3: Add the second mixture obtained in step 2 to the first mixture obtained in step 1. After mixing for 15-20 minutes, raise the temperature to 80°C, react for 7h, then raise the temperature to 95°C, react for 2h, and the pressure is 3 -6kg, obtain the first product;
[0064] Step 4, cooling the first product obtained in step 3 to a temperature of 35-45°C, washing with water, dehydrating, and fully drying at a temperature of 50-60°C to obtain a second product;
[0065] In step five, the se...
Embodiment 2
[0069] Example 2: An expandable copolymer resin for manufacturing lost foam casting models, the difference from Example 1 is that the components included therein and their corresponding qualities are shown in Table 1.
Embodiment 3
[0070] Embodiment 3: A kind of expandable copolymer resin that is used to manufacture lost foam casting model, and the difference of embodiment 1 is that the components included therein and their corresponding quality are as shown in Table 1, and in step 3, heat up To 70°C, react for 10h.
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Abstract
The invention discloses an expandable copolymer resin for manufacturing a lost foam casting model and a preparation method thereof and belongs to the field of lost foam casting materials. The expandable copolymer resin has the molecular weight of 150,000-300,000 and is prepared from a mixed monomer, deionized water, a cellulose ether dispersant, a sodium salt, an initiator, a foaming agent and a molecular weight regulator; the mixed monomer is prepared from MMA and ST, the MMA accounts for 70-95% of the weight of the mixed monomer, and the ST accounts for 5-30% of the weight of the mixed monomer; the sodium salt comprises at least one of sodium sulfate, sodium pyrophosphate and sodium dichromate; the foaming agent is prepared from n-pentane, isopentane and petroleum ether; the molecular weight regulator is prepared from at least one of divinylbenzene, ethylene glycol dimethacrylate, C8-C12 alkyl mercaptans, carbon tetrabromide and methyl styrene dimer. The model formed by the expandable copolymer resin has the advantage of reducing or eliminating carbon defects of castings during casting of cast iron and cast steel.
Description
technical field [0001] The invention relates to the field of lost foam casting materials, more specifically, it relates to an expandable copolymer resin for making lost foam casting models and a preparation method thereof. Background technique [0002] Lost foam casting is a new casting technology developed in the 1980s. Its key technology is to replace traditional wooden molds and wax molds with foam plastic molds. Its advantages are as follows: [0003] 1. The dimensional accuracy and surface finish of castings are higher than those of sand castings; [0004] 2. The emission of organic waste gas is less, and it is easy to realize clean production; [0005] 3. The structural design of castings has a great degree of freedom. The components processed and assembled by multiple parts can be molded in pieces and bonded together for integral casting, which greatly saves the cost of assembly and processing. [0006] In order to achieve the above advantages of lost foam casting, ...
Claims
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