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Water-soluble core mold material and preparation method thereof

A water-soluble, core mold technology, used in cores, manufacturing tools, casting and molding equipment, etc., can solve problems such as stress concentration, high cost, and high filler density, reducing viscosity, improving lubricating performance, and improving thermal stability. Effect

Active Publication Date: 2021-06-25
DONGGUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to some defects of these adhesives themselves, such as low bonding strength, difficulty in meeting production requirements in water solubility, complex water-soluble treatment process, high cost, etc., it is difficult to meet the strict requirements of adhesives for water-soluble mandrel materials in various fields. , thus limiting the scope of application of water-soluble mandrel materials
[0004] So far, the improvement of water-soluble mandrel materials mainly revolves around the development of the adhesive used, but the research on the fillers used in mandrel materials has not paid enough attention
This also limits the development of core mold materials to a certain extent.
Traditionally used fillers have been difficult to meet the requirements of some high-performance mandrel materials due to problems such as high density, irregular shape, and easy to cause stress concentration.

Method used

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  • Water-soluble core mold material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Preparation of water-soluble adhesive: heat 100 parts of polyvinylpyrrolidone to 130°C, then add 15 parts of polyethylene glycol 600, 10 parts of polyvinyl formal, and 1 part of stearic acid amide for blending to obtain the described water-soluble adhesive;

[0027] Preparation of water-soluble mandrel material: Add 10 parts of the prepared water-soluble adhesive to the reactor, raise the temperature to 195°C, and then add 100 parts of spherical graphite, 0.5 parts of lignosulfonate and 1 part of polymer with a length of 5 mm Propylene chopped fibers were stirred for 3 hours until uniformly mixed to obtain a mandrel material mixture. The mandrel material mixture was melted and shaped in a mold, cooled and demolded to obtain the water-soluble mandrel material.

Embodiment 2

[0029] Preparation of water-soluble adhesive: heat 100 parts of polyvinylpyrrolidone to 140°C, then add 20 parts of polyethylene glycol 600, 15 parts of polyvinyl formal, and 3 parts of stearic acid to obtain the described water-soluble adhesive;

[0030] Preparation of water-soluble mandrel material: Add 15 parts of the prepared water-soluble adhesive to the reactor, raise the temperature to 195°C, and add 100 parts of spherical graphite, 1 part of lignosulfonate and 2 parts of polymer with a length of 6 mm Ester chopped fibers, stirred for 3 hours until uniformly mixed to obtain a mandrel material mixture, which was melted and shaped in a mold, cooled and demolded to obtain the water-soluble mandrel material

Embodiment 3

[0032] Preparation of water-soluble adhesive: heat 100 parts of polyvinylpyrrolidone to 150°C, then add 25 parts of polyethylene glycol 600, 20 parts of polyvinyl butyral, and 5 parts of oleic acid amide for blending to obtain the described water-soluble adhesive;

[0033] Preparation of water-soluble mandrel material: Add 20 parts of the prepared water-soluble adhesive to the reactor, raise the temperature to 185°C, and add 100 parts of spherical graphite, 0.75 parts of lignosulfonate and 4 parts of poly Propylene chopped fibers were stirred for 2.5 hours until uniformly mixed to obtain a mandrel material mixture. The mandrel material mixture was melted and shaped in a mold, cooled and demolded to obtain the water-soluble mandrel material.

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Abstract

The invention discloses a water-soluble core mold material and a preparation method thereof. Main raw materials of the water-soluble core mold material comprise a water-soluble adhesive, graphite, a compatibilizer and chopped fibers, the weight ratio of the components is (10-30): 100: (0.5-1): (1-5), and the water-soluble adhesive is obtained by taking polyvinylpyrrolidone as a main adhesive and being supplemented with a low-melting-point alcohol plasticizer, a polar copolymer and polar wax. According to the water-soluble core mold material and the preparation method thereof, polyvinylpyrrolidone is modified, the viscosity of polyvinylpyrrolidone is reduced, and the lubricating property, strength and toughness of polyvinylpyrrolidone are improved. The compatibilizer is adopted to compatibilize and disperse the inorganic filler graphite, and the graphite filler is fully dispersed in the water-soluble adhesive, the thermal stability, thermal conductivity and strength of the water-soluble core mold material are improved, and the water-soluble core mold material can be applied to preparation of composite material components which have special structures and are difficult to demold.

Description

technical field [0001] The invention relates to the field of composite material components, in particular to a water-soluble mandrel material and a preparation method thereof. Background technique [0002] With the rapid development of modern industrial technology, especially the rapid development of aerospace industry, the shape of castings is becoming more and more complex; the requirements for the complexity of the inner cavity, dimensional accuracy and surface finish are getting higher and higher, which promotes the development of water-soluble cores. The birth of mold materials. Water-soluble mandrel material refers to some fillers that are bonded together by various water-soluble adhesives, and made into a certain shape according to the requirements of use. It has certain mechanical properties and can maintain its shape in the temperature range of use. When demolding, use solvents such as water to make it collapse and then demould to obtain a composite material of the...

Claims

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Application Information

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IPC IPC(8): B22C1/02B22C1/20
CPCB22C1/02B22C1/20
Inventor 徐勇军蔡卓弟谭世芝萧强郭恬钟月华
Owner DONGGUAN UNIV OF TECH