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Polymer matrix composite material with high PTC strength and stability and preparation method thereof

A technology of composite materials and polymers, which is applied in the field of PTC composite materials and its preparation, can solve the problems that it is difficult to realize the control of material structure and evolution of materials, the electrothermal performance of polymer PTC products is not stable enough, and the function of electronic devices is difficult to realize. Good repetitive stability, significant PTC performance, and NTC effect reduction effect

Inactive Publication Date: 2012-10-17
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With the rapid development of modern science and technology, the application field of polymer-based PTC materials continues to expand. It is difficult for polymer-based PTC materials with a single structure to meet the needs of society, and it is difficult for materials to realize the control of material structure and evolution, which leads to the electric heating of polymer PTC products. The performance is not stable enough, and the functions of related electronic devices are difficult to realize
The existing problems are mainly high resistivity at room temperature, poor cycle stability, and a certain gap with foreign countries in theory and technology.

Method used

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  • Polymer matrix composite material with high PTC strength and stability and preparation method thereof
  • Polymer matrix composite material with high PTC strength and stability and preparation method thereof
  • Polymer matrix composite material with high PTC strength and stability and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0027] (1) Dissolve 0.06g of titanate coupling agent in 50ml of ethanol, and stir it with magnetic force to fully dilute it evenly. Put 6g of CB into titanate coupling agent solution, modify it with 1% coupling agent by mass fraction, ball mill for 2h, and then put it in an oven at 120°C to evaporate the solvent. The dried CB was placed in a vacuum oven, evacuated at 120°C for 1 hour, and allowed to fully react and dry to obtain the desired surface-functionalized CB;

[0028] (2) Weigh 34.37g of PVDF, 17.95g of UHMWPE, and 2.98g of CB (f CB =4%) and 0.52 g of antioxidant 1010. In the Hakke Torque Rheometer, first, the molten PVDF was heated for 2 minutes; then UHMWPE and Antioxidant 1010 were added. Mix the mixture of the two bases for 10 minutes; then add CB in batches, and knead for 15 minutes at 250°C; after the melt blending is completed, discharge;

[0029] (3) The composite material obtained in step (2) was kept at 250°C and 18MPa for 10 minutes at constant temperatur...

example 2

[0039] (1) The surface treatment process of the CB particles is the same as in Example 1.

[0040] (2) Dissolve 0.06g of titanate coupling agent in 50ml of ethanol, and stir it with magnetic force to fully dilute it evenly. Put 6g of CB into the titanate coupling agent solution, ultrasonically disperse it for 2h, and then put it in an oven at 120°C to evaporate the solvent. The dried MWNTs were placed in a vacuum oven, evacuated and kept at 120°C for 1 hour to allow them to fully react and dry to obtain the desired surface-functionalized MWNTs;

[0041] (2) Weigh 34g of PVDF, 17.77g of UHMWPE, 0.52g of antioxidant 1010, and 2.98g of CB (f CB =4%), and the MWNT (f MWNT= 1%). In the Hakke torque rheometer, first, heat and melt PVDF for 2 minutes; then add UHMWPE and antioxidant 1010, and mix the mixture of the two matrices for 10 minutes; then add CB and MWNT in batches, and mix for 15 minutes at 250°C Minutes; after the melt blending is completed, discharge;

[0042] (3) P...

example 3

[0046] (1) The surface treatment process of CB particles is the same as Example 1, and the surface treatment process of MWNT is the same as Example 2.

[0047] (2) Weigh 33.65g PVDF, 17.58g UHMWPE, 0.51g antioxidant 1010 and 2.98g CB (f CB =4%), and the MWNT (f MWNT = 2%). In the Hakke torque rheometer, first, heat and melt PVDF for 2 minutes; then add UHMWPE and antioxidant 1010, and mix the mixture of the two matrices for 10 minutes; then add CB and MWNT in batches, and mix for 15 minutes at 250°C Minutes; after the melt blending is completed, discharge;

[0048] (3) Put the composite material obtained in step (2) on a hot press at 250°C and 18MPa under constant temperature and pressure for 10 minutes, cool naturally, and press it into (MWNT / CB) co-filled (PVDF / CB) with a thickness of 1mm and a diameter of 12mm. UHMWPE)((MWNT / CB)-co-filled-(PVDF / UHMWPE))(f CB = 4%, f MWNT =2%) of the disc sample;

[0049] (4) Coat the two ends of the sample obtained in step (3) with co...

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Abstract

The invention discloses a polymer matrix composite material with high PTC strength and stability and a preparation method thereof, and the composite material comprises UHMWPE and PVDF, CB and MWNT conductive filling materials which are treated by surface treatment by a titanate coupling agent, and an antioxidant 1010; the preparation method comprises the following steps: performing surface treatment of the CB and MWNT conductive filling materials by the titanate coupling agent, performing vacuum drying of PVDF and UHMWPE with a volume ratio of 1:1, adding PVDF into a torque rheometer, heatingand melting for 2 min, adding another matrix of UHMWPE and the antioxidant 1010, wherein the amount of the antioxidant 1010 is 1% of the total mass of the matrix; mixing the mixture of the two matrixes for 10 min, adding the filling materials, mixing at 250 DEG C for 15 min; after melt blending, performing hot pressing with a constant temperature of 250 DEG C and a constant pressure of 18 MPa for10 min to obtain the sample. The composite material of the invention has good conductivity and low room-temperature conductivity, and has a conductivity of up to 10-1 near a percolation threshold; the conductivity of the composite material can be changed by adjusting the contents of the filling materials in the composite material; the composite material has high PTC strength, good repetition stability, and reduced NTC effect.

Description

technical field [0001] The invention belongs to polymer-based PTC composite materials widely used in the field of modern electronics and electrical engineering, and particularly relates to a PTC composite material with high PTC strength, good cycle performance and stability and a preparation method thereof. Background technique [0002] At present, polymer-based PTC materials mainly use single-component crystalline or semi-crystalline polymers as matrix materials, and cost-effective conductive carbon black (CB) as conductive fillers. With the rapid development of modern science and technology, the application field of polymer-based PTC materials continues to expand. It is difficult for polymer-based PTC materials with a single structure to meet the needs of society, and it is difficult for materials to realize the control of material structure and evolution, which leads to the electric heating of polymer PTC products. The performance is not stable enough, and the functions o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L23/06C08L27/16C08K9/04C08K7/00C08K3/04
Inventor 党智敏李维康
Owner BEIJING UNIV OF CHEM TECH
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