CN112480303A

CN112480303A - Carbon defect-reducing copolymer resin for lost foam casting and preparation method thereof

Info

Publication number: CN112480303A
Application number: CN202011348962.8A
Authority: CN
Inventors: 韩晓红; 邹建伟
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-11-26
Filing date: 2020-11-26
Publication date: 2021-03-12

Abstract

The invention discloses a copolymer resin for lost foam casting for reducing carbon defects and a preparation method thereof, and relates to the technical field of materials for lost foam casting, wherein the copolymer resin for lost foam casting for reducing carbon defects comprises the following raw material components in parts by weight: 100 parts of mixed monomer, 200 parts of deionized water, 0.3 part of dispersant, 0.23 part of sodium salt, 0.4 part of initiator and 0.4 part of molecular weight regulator; the mixed monomer comprises methyl methacrylate, ethyl methacrylate, isobutyl acrylate, alpha methyl styrene and hexadecyl methacrylate; the dispersant is methyl cellulose ether; the sodium salt is sodium sulfate; the initiator comprises tert-butyl peroxybenzoate and tert-butyl peroxyisooctanoate; the molecular weight regulator comprises divinylbenzene, tetrabromomethane and xylene.

Description

Carbon defect-reducing copolymer resin for lost foam casting and preparation method thereof

Technical Field

The invention relates to the technical field of materials for lost foam casting, in particular to a copolymer resin for lost foam casting for reducing carbon defects and a preparation method thereof.

Background

At present, three materials are used for domestic lost foam casting, namely EPS, STMMA and EPMMA.

EPS belongs to the packaging industry, can only produce low-value products in the lost foam industry, and the carbon slag of the pattern produced by using EPS has a plurality of defects, and toxic gas is discharged in the combustion process, so that the EPS can not meet the pattern requirement of the lost foam industry.

The STMMA is mainly applied to middle and low-end products such as gray iron, ductile iron and common cast steel, the use of the STMMA can generate a carbon slag phenomenon, so that the STMMA cannot be applied to the research and development and production of high-end products.

The EPMMA has high manufacturing cost and high selling price, so that the EPMMA is not really applied to the market.

Disclosure of Invention

Aiming at the defects in the prior art, the invention provides a copolymer resin for lost foam casting, which reduces carbon defects, and a preparation method thereof.

The copolymer resin for lost foam casting for reducing carbon defects comprises the following raw material components in parts by weight:

100 parts of mixed monomer, 200 parts of deionized water, 0.3 part of dispersant, 0.23 part of sodium salt, 0.4 part of initiator and 0.4 part of molecular weight regulator;

the mixed monomer comprises methyl methacrylate, ethyl methacrylate, isobutyl acrylate, alpha methyl styrene and hexadecyl methacrylate;

the dispersant is methyl cellulose ether;

the sodium salt is sodium sulfate;

the initiator comprises tert-butyl peroxybenzoate and tert-butyl peroxyisooctanoate;

the molecular weight regulator comprises divinylbenzene, tetrabromomethane and xylene.

Preferably, the weight ratio of the methyl methacrylate, the ethyl methacrylate, the isobutyl acrylate, the alpha-methyl styrene and the hexadecyl methacrylate is 85:5:4:5: 1.

Preferably, the weight ratio of the divinylbenzene to the tetrabromomethane to the xylene is 1:2: 1.

Preferably, the weight ratio of the tert-butyl peroxybenzoate to the tert-butyl peroxyisooctanoate is 5: 3.

the preparation method of the copolymer resin for lost foam casting for reducing carbon defects comprises the following steps:

s1, adding deionized water into a reaction kettle, heating, adding a dispersing agent, stirring, adding sodium salt, and cooling to obtain a first mixture;

s2, adding a mixed monomer, an initiator and a molecular weight regulator into the first mixture, stirring, and standing to obtain a second mixture;

and S3, stirring the second mixture, heating and preserving heat for the first time, heating and preserving heat for the second time, cooling after the reaction is finished when the pressure reaches 0.8MPa, and thus obtaining the copolymer resin for lost foam casting, which reduces carbon defects.

Preferably, in step S1, the temperature is raised to 85 ℃.

Preferably, in step S1, the stirring is performed for 30min at a stirring speed of 40-50 r/min; the temperature reduction is to be carried out to 15-35 ℃.

Preferably, in step S2, the stirring is performed at a stirring speed of 40-50r/min for 30min, and the standing is performed for 30 min.

Preferably, in step S3, the stirring is carried out for 60min at a stirring speed of 40-50r/min, the first temperature rise and preservation is carried out for 210min, the temperature rises to 74-78 ℃ at a constant speed, and the temperature is preserved for 6 h; the second heating and heat preservation is 60min, the temperature is uniformly raised to 100 ℃, and the heat preservation is carried out for 2 h.

The invention has the beneficial effects that:

(1) the copolymer resin for lost foam casting for reducing carbon defects, which is provided by the invention, has low cost, adopts the benzene-ring-free raw material component as the main raw material, and when the copolymer resin is used for lost foam casting, gas generated immediately when molten iron is contacted with a white mold can be directly discharged through a coating, so that carbon spots cannot be formed in a casting, the problem of carbon defects is avoided, and the product quality is stable.

(2) The preparation method of the copolymer resin for lost foam casting for reducing carbon defects, provided by the invention, is simple to operate and stable in technology, and the prepared product has excellent performance and great commercial value.

Drawings

In order to more clearly illustrate the detailed description of the invention or the technical solutions in the prior art, the drawings that are needed in the detailed description of the invention or the prior art will be briefly described below.

FIG. 1 is a surface condition view of a butterfly anchor rod No. 1;

FIG. 2 is a surface condition diagram of a butterfly anchor rod No. 2;

FIG. 3 is a surface view of a deformed steel bar cap No. 1;

FIG. 4 is a surface view of the screw-thread steel cap No. 2.

Detailed Description

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and therefore are only examples, and the protection scope of the present invention is not limited thereby.

It is to be noted that, unless otherwise specified, technical or scientific terms used herein shall have the ordinary meaning as understood by those skilled in the art to which the invention pertains.

Examples

The copolymer resin for lost foam casting for reducing the carbon defects comprises the following raw material components in parts by weight:

the dispersant is methyl cellulose ether;

the sodium salt is sodium sulfate;

The weight ratio of the methyl methacrylate to the ethyl methacrylate to the isobutyl acrylate to the alpha-methyl styrene to the hexadecyl methacrylate is 85:5:4:5: 1.

The weight ratio of the divinylbenzene to the tetrabromomethane to the xylene is 1:2: 1.

The weight ratio of tert-butyl peroxybenzoate to tert-butyl peroxyisooctanoate is 5: 3.

In step S1, stirring for 30min at a stirring speed of 45 r/min; the temperature reduction is to be carried out to 15-35 ℃.

In step S2, the stirring is carried out for 30min at a stirring speed of 45r/min, and the standing is carried out for 30 min.

In step S3, stirring for 60min at a stirring speed of 45r/min, heating for 210min for the first time, uniformly heating to 74-78 ℃, and keeping the temperature for 6 h; the second heating and heat preservation is 60min, the temperature is uniformly raised to 100 ℃, and the heat preservation is carried out for 2 h.

Test example 1

Quality test of casting 1

Sample material quality: ASTM-65-45-12;

test samples: respectively manufacturing models by adopting the copolymer resin for lost foam casting and STMMA (styrene-methyl methacrylate) for reducing carbon defects, which are prepared in the embodiment, and casting parts cast under the same condition are a butterfly anchor rod No. 1 and a butterfly anchor rod No. 2;

wherein the STMMA is available from Hangzhou Kaiser chemical Co., Ltd, and has a model number of 3A #.

The test method comprises the following steps: and (3) after the same processing surface is processed, comparing and detecting, and observing the surface condition, wherein the surface condition is shown in figures 1 and 2.

Detection company: yangzhou Jingshang machinery manufacturing Co., Ltd.

TABLE 1

	Sample (I)	Surface condition of the surface
			Examples	Butterfly anchor bar No. 1	No carbon defect
STMMA	Butterfly anchor rod No. 2	Has obvious carbon defect

Test example 2

Quality test 2 of casting

Sample material quality: ASTM-65-45-12;

test samples: the casting parts cast under the same conditions by adopting the models respectively manufactured by the copolymer resin for lost foam casting and the STMMA, which are prepared in the embodiment and reduce the carbon defect, are respectively No. 1 and No. 2 of the deformed steel bar cap;

wherein, STMMA is purchased from Hangzhou Kaiser chemical Co., Ltd, and has model number 2.

The test method comprises the following steps: and (4) after the same processing surface is processed, comparing and detecting, and observing the surface condition, wherein the surface condition is as shown in figures 3 and 4.

Detection company: chifeng Yusheng machinery manufacturing Co., Ltd.

TABLE 2

	Sample (I)	Surface condition of the surface
			Examples	Deformed steel bar cap No. 1	No carbon defect
STMMA	Deformed steel bar cap No. 2	Has obvious carbon defect

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention, and they should be construed as being included in the following claims and description.

Claims

1. A copolymer resin for lost foam casting which reduces carbon defects, characterized in that: the copolymer resin for lost foam casting for reducing carbon defects comprises the following raw material components in parts by weight: 100 parts of mixed monomer, 200 parts of deionized water, 0.3 part of dispersant, 0.23 part of sodium salt, 0.4 part of initiator and 0.4 part of molecular weight regulator; the mixed monomer comprises methyl methacrylate, ethyl methacrylate, isobutyl acrylate, alpha methyl styrene and hexadecyl methacrylate; the dispersant is methyl cellulose ether; the sodium salt is sodium sulfate; the initiator comprises tert-butyl peroxybenzoate and tert-butyl peroxyisooctanoate; the molecular weight regulator comprises divinylbenzene, tetrabromomethane and xylene.

2. The copolymer resin for lost foam casting with reduced carbon defects according to claim 1, wherein: the weight ratio of the methyl methacrylate to the ethyl methacrylate to the isobutyl acrylate to the alpha-methyl styrene to the hexadecyl methacrylate is 85:5:4:5: 1.

3. The copolymer resin for lost foam casting with reduced carbon defects according to claim 1, wherein: the weight ratio of the divinylbenzene to the tetrabromomethane to the xylene is 1:2: 1.

4. The copolymer resin for lost foam casting with reduced carbon defects according to claim 1, wherein: the weight ratio of tert-butyl peroxybenzoate to tert-butyl peroxyisooctanoate is 5: 3.

5. the method for producing a copolymer resin for lost foam casting with reduced carbon defects according to any one of claims 1 to 4, wherein: the preparation method comprises the following steps: s1, adding deionized water into a reaction kettle, heating, adding a dispersing agent, stirring, adding sodium salt, and cooling to obtain a first mixture; s2, adding a mixed monomer, an initiator and a molecular weight regulator into the first mixture, stirring, and standing to obtain a second mixture; and S3, stirring the second mixture, heating and preserving heat for the first time, heating and preserving heat for the second time, cooling after the reaction is finished when the pressure reaches 0.8MPa, and thus obtaining the copolymer resin for lost foam casting, which reduces carbon defects.

6. The process for producing a copolymer resin for lost foam casting with reduced carbon defects according to claim 5, wherein: in step S1, the temperature is raised to 85 ℃.

7. The process for producing a copolymer resin for lost foam casting with reduced carbon defects according to claim 5, wherein: in step S1, stirring for 30min at a stirring speed of 40-50 r/min; the temperature reduction is to be carried out to 15-35 ℃.

8. The process for producing a copolymer resin for lost foam casting with reduced carbon defects according to claim 5, wherein: in step S2, stirring for 30min at a stirring speed of 40-50r/min, and standing for 30 min.

9. The process for producing a copolymer resin for lost foam casting with reduced carbon defects according to claim 5, wherein: in step S3, stirring for 60min at a stirring speed of 40-50r/min, heating for 210min at constant speed to 74-78 ℃ for the first time, and keeping the temperature for 6 h; the second heating and heat preservation is 60min, the temperature is uniformly raised to 100 ℃, and the heat preservation is carried out for 2 h.