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Polyurethane/silicon rubber thermoplastic elastomer and preparation method thereof

A thermoplastic elastomer and silicone rubber technology, which is applied in the field of polyurethane/silicone rubber thermoplastic elastomer and its preparation, can solve problems such as insufficient heat resistance, and achieve high production efficiency, excellent heat resistance, and good hand feel.

Inactive Publication Date: 2011-08-17
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] As we all know, silicone rubber has outstanding high and low temperature resistance and weather aging resistance, but there are certain deficiencies in mechanical strength and oil resistance; while TPU has excellent mechanical properties and oil resistance, but its heat resistance is insufficient

Method used

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  • Polyurethane/silicon rubber thermoplastic elastomer and preparation method thereof
  • Polyurethane/silicon rubber thermoplastic elastomer and preparation method thereof
  • Polyurethane/silicon rubber thermoplastic elastomer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1~4

[0038] Examples 1~4: Heat the torque rheometer (Shanghai Kechuang Co., Ltd.) to 190°C, add polyurethane TPU and silicone rubber VSR in the formula listed in Table 1 to the torque rheometer, and wait for the materials to melt After mixing evenly, add a cross-linking agent. The cross-linking agent is dimethylhydrogen polysiloxane (the same below) with a silicon hydrogen content (weight fraction) of 0.3~2% organosilicon compound methaneoxy end-capped. After the torque was balanced, the catalyst was added, the rotor speed was 70 r / min, the mixture was kneaded for 10 minutes, the samples were taken out, and the tableting performance was tested. The catalyst used in this experiment is a platinum complex complexed with chloroplatinic acid and tetramethyldivinyldisiloxane (the same below).

Embodiment 5~8

[0041] Examples 5-8: Heat the torque rheometer to 190°C, add the TPU and VSR in the formula listed in Table 2 into the rheometer, and after the materials are melted and kneaded evenly, add a crosslinking agent, and wait for conversion After the moment is balanced, the catalyst is added, the rotor speed is 70 r / min, the kneading is carried out for 10 minutes, the sample is taken from the press plate, and the performance is tested.

[0042]

[0043] It can be seen from Table 2 that the mechanical properties of thermoplastic elastomers increase with the increase of catalyst content. When the catalyst content reaches a certain ratio, the performance of thermoplastic elastomers is almost unchanged.

[0044] Examples 9~10 and 12~13: Heat the torque rheometer to 190°C, put the TPU and VSR in the formula listed in Table 3 into the rheometer, and after the materials are melted and kneaded evenly, add crosslinking After the torque is balanced, add the catalyst, the rotor speed is 70 ...

Embodiment 11

[0045]Example 11: Heat the torque rheometer to 190°C, add the TPU and VSR in the formula listed in Table 3 to the torque rheometer, and after the materials are melted and kneaded evenly, add a crosslinking agent, and wait for conversion After moment balance, the catalyst was added, the rotor speed was 70 r / min, and kneading was carried out for 10 minutes. The sample was cooled in liquid nitrogen, ultra-thin sectioned, and the morphology of the sample was observed by SEM. Sampling and tableting, performance testing.

[0046]

[0047] It can be seen from Table 3 that when the content of crosslinker is less, the mechanical properties of the elastomer are poor. When the content of crosslinking agent is 3 parts, the performance of the elastomer is the best.

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Abstract

The invention discloses a polyurethane / silicon rubber thermoplastic elastomer and a preparation method thereof, and provides a polyurethane / silicon rubber thermoplastic elastomer which can be repeatedly processed and has good mechanical property and fine heat and oil resistance and a preparation method thereof. The elastomer is composed of polyurethane, silicon rubber, a cross-linking agent, a catalyst and a compatilizer. The preparation method comprises the following steps: adding the polyurethane into a blending device from an intermixing machine or a two-screw extruder at the blending temperature of 160-200 DEG C, then adding the silicon rubber and the compatilizer to blend for 3-4 minutes, then adding the cross-linking agent, and finally, adding the catalyst; and reacting and blending for 6-7 minutes so as to obtain the dynamically vulcanized polyurethane / silicon rubber thermoplastic elastomer with high performance. Compared with other types of thermoplastic elastomers, the polyurethane / silicon rubber thermoplastic elastomer has the advantages of fine heat resistance, wear resistance and mechanical property and good hand feel, and can be widely applied to the fields of automobiles, buildings, medical instruments, cables and the like.

Description

technical field [0001] The invention relates to a dynamically vulcanized polyurethane / silicone rubber blended thermoplastic elastomer and a preparation method. Background technique [0002] Dynamic vulcanization refers to the in-situ vulcanization of rubber during the melting and mixing process of the rubber phase and the thermoplastic polymer that cannot be vulcanized, and the granular vulcanized rubber phase is dispersed in the thermoplastic polymer matrix, and the shape of the rubber micro-domain is very stable. No physical and chemical changes occur during the process, and the resulting blend combines the elasticity of rubber with the reproducibility of plastic. Among them, PP (polypropylene) / EPDM (ethylene propylene terpolymer) dynamic vulcanization product is one of the successfully developed commercialized products, but due to its low heat resistance, it limits its application in high temperature applications such as automobile engines. field. [0003] Thermoplastic...

Claims

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Application Information

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IPC IPC(8): C08L75/04C08L75/06C08L75/08C08L83/04C08L83/07
Inventor 雷彩红李善良
Owner GUANGDONG UNIV OF TECH
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