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Ornament investment casting pattern material based on modified polyurethane elastomer and preparation method thereof

A polyurethane elastomer and investment casting technology, which is applied in the field of investment precision casting, can solve the problems of performance gap and other problems, and achieve the effects of moderate softening point and penetration, large market value and low viscosity

Pending Publication Date: 2021-08-06
DONGGUAN UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But at present, thermoplastic elastomers have not been able to combine all the advantages of thermoplastics and thermoplastic rubbers at the same time, and there is still a certain gap in some properties.

Method used

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  • Ornament investment casting pattern material based on modified polyurethane elastomer and preparation method thereof
  • Ornament investment casting pattern material based on modified polyurethane elastomer and preparation method thereof
  • Ornament investment casting pattern material based on modified polyurethane elastomer and preparation method thereof

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Experimental program
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preparation example Construction

[0038] In order to obtain the above-mentioned jewelry investment casting molding material, the present invention also provides a related preparation method, which comprises the following steps:

[0039] Preparation of modified polyurethane elastomer: physically blending polyurethane elastomer and polyolefin elastomer, and silylation modification to obtain modified polyurethane elastomer;

[0040] Preparation of jewelry investment casting mold materials: add mineral wax, animal and vegetable wax and synthetic wax to the reaction kettle, heat and melt, and the heating reaction temperature is 120°C-130°C; then add tackifying resin and modified polyurethane elastomer to make it Uniformly dispersed in the base wax matrix, you can get jewelry investment casting mold material.

[0041] In one or more embodiments, the step of preparing a modified polyurethane elastomer includes:

[0042] Physical blending of polyurethane elastomer and polyolefin elastomer: Prepare polyurethane elasto...

Embodiment 1

[0048] The ornamental investment casting molding material based on modified polyurethane elastomer of the present embodiment, in terms of mass percentage, includes the following components:

[0049]

[0050] The method for preparing the jewelry investment casting mold material of the present embodiment comprises the following steps:

[0051] (1) Add polyurethane elastomer and polyolefin elastomer raw materials in a high-speed mixer at a ratio of 7:3, heat up to 170°C, and stir at a speed of 500rpm for 15min until the materials are evenly mixed to obtain a blended composite material;

[0052] (2) Then add vinyltrimethoxysilane, dicumyl peroxide, dibutyltin dilaurate, antioxidant 1098 and the blended composite material to melt and mix uniformly under the high-speed mixer. Extrude into granules in the machine;

[0053] (3) Boil the granulated blended material in a constant temperature water bath at 90°C for at least 48 hours to boil and cross-link, and place the cross-linked ...

Embodiment 2

[0057] The ornamental investment casting molding material based on modified polyurethane elastomer of the present embodiment, in terms of mass percentage, includes the following components:

[0058]

[0059] The method for preparing the jewelry investment casting mold material of the present embodiment comprises the following steps:

[0060] (1) Add polyurethane elastomer and polyolefin elastomer raw materials in a high-speed mixer at a ratio of 7:3, heat up to 170°C, and stir at a speed of 500rpm for 15min until the materials are evenly mixed to obtain a blended composite material;

[0061] (2) Then add vinyltrimethoxysilane, dicumyl peroxide, dibutyltin dilaurate, antioxidant 1098 and the blended composite material to melt and mix uniformly under the high-speed mixer. Extrude into granules in the machine;

[0062] (3) Boil the granulated blended material in a constant temperature water bath at 90°C for at least 48 hours to boil and cross-link, and place the cross-linked ...

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Abstract

The invention relates to the technical field of investment casting, in particular to an ornament investment casting pattern material based on a modified polyurethane elastomer and a preparation method thereof. The ornament investment casting pattern material comprises 30%-55% of mineral wax, 16%-23% of animal and plant wax, 3%-10% of synthetic wax, 15%-35% of tackifying resin and 4%-9% of the modified polyurethane elastomer. The modified polyurethane elastomer is prepared from a polyurethane elastomer and a polyolefin elastomer through silanization grafting modification. The preparation method comprises the following steps: physically blending the polyurethane elastomer and the polyolefin elastomer, and carrying out silanization modification to obtain the modified polyurethane elastomer; and heating and melting the mineral wax, the animal and plant wax and the synthetic wax, and adding the tackifying resin and the modified polyurethane elastomer to obtain the ornament investment casting pattern material. The ornament investment casting pattern material is moderate in softening point and needle penetration, low in viscosity, good in toughness, low in ash content, suitable for ornaments with high toughness requirements and high in market value.

Description

technical field [0001] The invention relates to the technical field of investment precision casting, in particular to an ornamental investment casting mold material based on modified polyurethane elastomer and a preparation method thereof. Background technique [0002] Investment casting, also known as "lost wax casting", is an advanced near-net-shape forming process. The castings are precise and complex, close to parts, and the final shape can be used directly without or with little processing Used in all industrial sectors, especially electronics, petroleum, chemical, nuclear energy, transportation, light industry, textile, pharmaceutical, medical equipment, pump and valve industries, etc. [0003] With the development of the national economy and the improvement of people's living standards, the development of jewelry casting is very rapid, with more and more styles and styles, and more and more complex shapes. The complexity of the shape of the product has been greatly i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L91/06C08L23/06C08L57/02C08L75/04C08L23/08C08K5/5425C08L23/12C08L25/16B22C7/02
CPCC08L91/06B22C7/02C08L2205/025C08L2205/035
Inventor 不公告发明人
Owner DONGGUAN UNIV OF TECH
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