A kind of low Curie temperature point PTC organic composite material and preparation method thereof

A technology of composite materials and temperature points, which is applied in the field of constant temperature materials, low Curie temperature PTC organic composite materials and their preparation, can solve the problems of limiting PTC composite materials, difficulty, and lowering the melting point of composite materials, so as to improve the strength of PTC , lower the melting point, and ensure safety

Active Publication Date: 2019-11-15
SOUTH CHINA UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For some instruments and equipment that need temperature control in the normal temperature working section, such as temperature control equipment used on the human body (combat thermal insulation clothing, thermal insulation pads, children's incubators, etc.), PTC composite materials with high Curie temperature points cannot meet the requirements. Market demand limits the further application of PTC composite materials in the low-temperature section, and the current research on organic PTC composite materials with low Curie temperature is affected by the melting point of the matrix material (the Curie temperature point of the composite material is related to the melting point of the material), It is difficult to reduce the melting point of the composite material through one or more organic matrix modifications, so that its Curie point can be lowered below 50°C, meeting the market's requirements for temperature control in low-temperature areas

Method used

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  • A kind of low Curie temperature point PTC organic composite material and preparation method thereof
  • A kind of low Curie temperature point PTC organic composite material and preparation method thereof
  • A kind of low Curie temperature point PTC organic composite material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0030] Raw materials: prepare the materials by their weight (unit / g) according to the formula described in Table 1 (respectively corresponding to the model of raw materials);

[0031] Step 1. Pretreatment of acetylene carbon black: Soak acetylene carbon black with acetone for 24 hours to remove organic substances that may be adsorbed on the surface of acetylene carbon black, filter and distill under reduced pressure to remove acetone; then heat at 100°C for 120 minutes to remove the surface of acetylene carbon black Adsorbed volatile substances;

[0032] Step 2. Mixing and molding of raw materials: Add ethylene-vinyl acetate copolymer (EVA) powder and lauric acid (LA) particles that have been dried in advance into a beaker, pour an appropriate amount (about 50mL) of xylene, and stir in a mechanical Dissolve under heating conditions (temperature about 80°C); after complete dissolution, add acetylene carbon black, mix well, add auxiliary materials (antioxidant 1010, silane coupl...

Embodiment 2

[0036] Raw materials: prepare the materials by their weight (unit / g) according to the formula described in Table 1 (respectively corresponding to the model of raw materials);

[0037]Step 1. Pretreatment of acetylene carbon black: soak acetylene carbon black with acetone for 24 hours to remove organic substances that may be adsorbed on the surface of acetylene carbon black, filter and distill under reduced pressure to remove acetone; then heat at 120°C for 100 minutes to remove the surface of acetylene carbon black Adsorbed volatile substances;

[0038] Step 2. Mixing and molding of raw materials: Add ethylene-vinyl acetate copolymer (EVA) powder and lauric acid (LA) particles that have been dried in advance into a beaker, pour an appropriate amount (about 55mL) of xylene, and stir in a mechanical And dissolve under the condition of heating (temperature about 80°C); after completely dissolving, add other substances (acetylene carbon black, antioxidant AN5057, silane coupling a...

Embodiment 3

[0042] Raw materials: prepare the materials by their weight (unit / g) according to the formula described in Table 1 (respectively corresponding to the model of raw materials);

[0043] Step 1. Pretreatment of acetylene carbon black: Soak acetylene carbon black with acetone for 24 hours to remove organic substances that may be adsorbed on the surface of acetylene carbon black, filter and distill under reduced pressure to remove acetone; then heat at 80°C for 100 minutes to remove the surface of acetylene carbon black Adsorbed volatile substances;

[0044] Step 2. Mixing and molding of raw materials: Add ethylene-vinyl acetate copolymer (EVA) powder and lauric acid (LA) particles that have been dried in advance into a beaker, pour an appropriate amount (about 50mL) of xylene, and stir in a mechanical Dissolve under heating conditions (temperature about 70°C); after completely dissolving, add other substances (acetylene carbon black, antioxidant 168, silane coupling agent KH-560, ...

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Abstract

The invention discloses a low-Curie-temperature-point positive temperature coefficient (PTC) organic composite material and a preparation method thereof. The low-Curie-temperature-point PTC organic composite material is prepared from the following raw materials by mass percent: 18-22% of ethylene-vinyl acetate copolymer (EVA), 54-66% of lauric acid, 5-10% of acetylene black and 10-15% of auxiliarymaterial. The preparation method adopts a solution method, and comprises the steps of mixing the dried EVA powder and lauric acid granules according to the proportion, adding an aromatic hydrocarbonsolvent, and dissolving; adding the treated acetylene black, evenly mixing, and adding the auxiliary material; carrying out ultrasonic treatment; removing the aromatic hydrocarbon solvent, and carrying out heat treatment. The composite material prepared by the method has a Curie temperature of lower than 50 DEG C, and the adding amount of conducting particles is less than 10%; furthermore, the composite material has flexibility, is low in cost, thin, safe and reliable, has low resistivity at the room temperature, and is suitable for large-area heating.

Description

technical field [0001] The invention relates to a constant temperature material, in particular to a low Curie temperature point PTC organic composite material and a preparation method thereof, belonging to the technical field of precise temperature control. Background technique [0002] With the advancement of science and technology and the need to explore the unknown, instruments and equipment will become more and more sophisticated, their working environment will become more and more complex, and the requirements for thermal control systems will become higher and higher. In addition to higher and higher requirements for temperature control accuracy and reliability and stability, in aerospace, electronics and other fields, due to strict restrictions on the weight and volume of thermal control systems, lightweight and miniaturization will become another important factor in the development of thermal control technology. direction. [0003] PTC (Positive Temperature Coefficie...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L23/08C08K5/09
CPCC08K5/09C08L23/0853
Inventor 李静常畅杨美玲李雪
Owner SOUTH CHINA UNIV OF TECH
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