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Water-soluble core mold material and preparation method thereof

A water-soluble, mandrel technology, applied in the field of water-soluble mandrel material and its preparation, can solve the problems of insufficient bending strength and compressive strength, low bearing load, poor formability, etc. Simple to use effects

Inactive Publication Date: 2018-02-09
CHENGDU AERONAUTIC POLYTECHNIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the above-mentioned deficiencies in the prior art, the present invention provides a water-soluble mandrel material and a preparation method thereof, which can effectively solve the problems of the existing water-soluble mandrel materials, such as small bearing load, insufficient bending strength and compressive strength, and problems of forming If the degree is poor, there will be problems such as slag falling and delamination

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] A water-soluble mandrel material includes filling materials and water-soluble adhesives, and the amount of the water-soluble adhesives added is 0.05 times the weight of the filling materials.

[0041] Wherein, the water-soluble adhesive includes the following components by weight: 4 parts of 10wt% polyvinyl alcohol aqueous solution, 7 parts of 30wt% polyvinylpyrrolidone aqueous solution, 6 parts of modified starch, 1 part of garlic juice, 1 part of yam juice 2 parts and 2 parts of okra extract.

[0042] Modified starch is prepared by the following methods:

[0043] (1) Stir and mix corn starch, sodium hypochlorite, hydrogen peroxide and water, heat up to 50°C, and continue stirring for 60 minutes; wherein, starch, sodium hypochlorite, hydrogen peroxide and water are mixed in a weight ratio of 20:3:3:65;

[0044] (2) Add 2wt% sodium hydroxide aqueous solution to the resultant of step (1), stir at 30°C for 30min, then dropwise add acrylonitrile monomer, control the rate ...

Embodiment 2

[0059] A water-soluble mandrel material includes a filling material and a water-soluble adhesive, and the amount of the water-soluble adhesive added is 0.3 times the weight of the filling material.

[0060] Wherein, the water-soluble adhesive includes the following components by weight: 15 parts of 20 wt % polyvinyl alcohol aqueous solution, 30 parts of 40 wt % polyvinylpyrrolidone aqueous solution, 18 parts of modified starch, 3 parts of garlic juice, 4 parts of yam juice 6 parts and 6 parts of okra extract.

[0061] Modified starch is prepared by the following methods:

[0062] (1) Stir and mix cornstarch, sodium hypochlorite, hydrogen peroxide and water, heat up to 60°C, and continue stirring for 40 minutes; wherein, starch, sodium hypochlorite, hydrogen peroxide and water are mixed in a weight ratio of 25:5:5:80;

[0063] (2) Add 2wt% sodium hydroxide aqueous solution to the resultant of step (1), stir at 40°C for 20min, then dropwise add acrylonitrile monomer, control th...

Embodiment 3

[0078] A water-soluble mandrel material includes a filling material and a water-soluble adhesive, and the amount of the water-soluble adhesive added is 0.08 times the weight of the filling material.

[0079] Wherein, the water-soluble adhesive includes the following components by weight: 10 parts of 15 wt % polyvinyl alcohol aqueous solution, 15 parts of 35 wt % polyvinylpyrrolidone aqueous solution, 12 parts of modified starch, 1 part of garlic juice, 2 parts of yam juice 4 parts and 4 parts of okra extract.

[0080] Modified starch is prepared by the following methods:

[0081] (1) Stir and mix corn starch, sodium hypochlorite, hydrogen peroxide and water, heat up to 50°C, and continue stirring for 60 minutes; wherein, starch, sodium hypochlorite, hydrogen peroxide and water are mixed in a weight ratio of 22:3:5:75;

[0082] (2) Add 2wt% sodium hydroxide aqueous solution to the resultant of step (1), stir at 40°C for 20min, then dropwise add acrylonitrile monomer, control t...

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Abstract

The invention discloses a water-soluble core mold material which comprises a filling material and a water-soluble adhesive, wherein the addition amount of the water-soluble adhesive is 0.05-0.3 time that of the filling material; the water-soluble adhesive comprises the following components in parts by weight: 4-15 parts of a 10-20wt% polyvinyl alcohol solution, 7-30 parts of a 30-40% polyvinyl pyrrolidone solution, 6-18 parts of modified starch, 1-3 parts of garlic juice, 1-4 parts of Chinese yam juice and 2-6 parts of an okra extract. A preparation method of the water-soluble core mold material comprises the following steps: (1) preparing the water-soluble adhesive; (2) pretreating the filling material; (3) performing preformation; (4) performing curing and demolding. The preparation method is non-toxic in raw material, free of environment pollution, low in cost and simple to operate, and the water-soluble core mold material prepared by using the preparation method is large in bearingcapacity, relatively good in bending strength and compression strength, high in formation degree, free of phenomenon such as chipping or layering, and applicable to industrial production.

Description

technical field [0001] The invention belongs to the technical field of water-soluble mandrel materials, and in particular relates to a water-soluble mandrel material and a preparation method thereof. Background technique [0002] Water-soluble mandrel material refers to some fillers that are bonded together by various water-soluble adhesives, and made to have certain properties according to the requirements of use. It has certain mechanical properties and can maintain properties within the temperature range of use. , use water and other solvents to make it collapse when demoulding, and then demoulding to obtain a composite material of the product. Water-soluble mandrel materials have been widely used in various casting and composite material manufacturing industries with high standards and strict requirements due to their high molding precision, low cost, high efficiency, and easy demoulding. Starch polymer, as a traditional water-soluble adhesive, has the characteristics o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L39/06C08L29/04C08L3/04C08K13/04C08K5/00C08K3/34C08K7/28C08F289/00C08F220/44
CPCC08L39/06C08F289/00C08K2201/003C08L2205/03C08L29/04C08L3/04C08K13/04C08K5/0008C08K3/34C08K7/28C08F220/44
Inventor 王新玲黄频波付成龙吴悦梅李斌苟明谢济民江丽芳肖世鹏
Owner CHENGDU AERONAUTIC POLYTECHNIC
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