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Preparation method of leadless high-density plasticine

A lead-free high-density plasticine technology, applied in the field of high-energy radiation shielding materials, can solve the problems of high melting point and high metal hardness, and achieve the effects of high density, good hand feeling and good high-energy radiation shielding performance

Inactive Publication Date: 2012-10-03
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the high hardness, high melting point and brittleness of tungsten metal limit its application, so tungsten alloy is widely used

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0009] The following examples further illustrate the present invention

[0010] Step 1. Weigh 400 grams of tungsten powder into the beaker, then add 300 mL of ethanol; measure 5 mL of silane coupling agent KH550, and add it to the beaker. At 65°C, electromagnetic stirring was performed for 3 hours. The modified tungsten powder is filtered out, and dried for 12 hours at a temperature of 90°C for use.

[0011] Step 2. Weigh 19.5 grams of low melting point thermoplastic vinyl acetate resin, mix it with the modified tungsten powder, and dry it in vacuum at 80°C for 6.5 hours. Use an internal mixer or screw extruder to blend, and then perform hot pressing at 100-180°C and a pressure of 0.5-2.0 MPa to obtain lead-free high-density plasticine.

[0012] The third step. The resulting plasticine is molded at 40°C and a pressure of 0.01 MPa to obtain the required complex shape.

[0013] The lead-free high-density plasticine prepared by the above method can have the plasticity of plasticine at ...

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Abstract

The invention provides a preparation method of leadless high-density plasticine, and belongs to the technical field of a high-energy radiation shielding material. The leadless high-density plasticine is prepared from the raw materials of tungsten powder, a coupling agent, thermoplastic elastomer and the like. The preparation method comprises the steps: modifying the tungsten powder (or tungsten alloy powder) by the coupling agent, uniformly mixing and processing the tungsten powder (or tungsten alloy powder) and low-melting-point thermoplastic polyurethane (or vinyl acetate resin) mixture utilizing an internal mixer or a screw extruder, and carrying out hot pressing at 100-180 DEG C and pressure of 0.5-2.0MPa to obtain the leadless high-density plasticine composite material. The leadless high-density plasticine composite material prepared by the method is high in density, good in viscosity, good in hand feeling, definite in moulding, difficult in plasticine adhesion and color adhesion on hand, and wide in application temperature range; furthermore, the material has the density more than 10.0g / cm<3>, and has excellent high-energy radiation shielding performance; and in particular, the composite material also has the advantages of being leadless, environment-friendly and the like.

Description

Technical field [0001] The invention relates to the use of tungsten powder (or its alloy powder) and thermoplastic polyurethane (or vinyl acetate resin) to prepare lead-free high-density plasticine under a certain temperature and a certain pressure, and belongs to the technical field of high-energy radiation shielding materials. Background technique [0002] In recent years, lead-containing materials have been widely used in industry, and the large-scale use of lead with high pollution, high toxicity, low strength, and low efficiency will be quickly eliminated; and the comprehensive performance, environmentally friendly and non-toxic tungsten-containing lead Material will be the most ideal alternative material. Tungsten-containing materials are the most excellent high-energy ray shielding materials. They have excellent attenuation and absorption capabilities for X-rays, g-rays and radioisotope radiation, and are more than 40% higher than commonly used lead. They are used in medic...

Claims

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Application Information

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IPC IPC(8): C08L75/04C08L31/04C08K3/08C08K3/10B29C43/58
Inventor 李运波
Owner SHANGHAI UNIV
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