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Preparation of rubber blended macromolecular compatibilizer and application of rubber blended macromolecular compatibilizer in NR/EPDM alloy elastomer

A technology of macromolecules and compatibilizers, which is applied in the preparation of macromolecular compatibilizers for rubber and its application in NR/EPDM alloy elastomers, which can solve the problems of poor physical and mechanical properties of blended vulcanized rubber, NR and EPDM Kinetic compatibility is not very good, vulcanization rate difference is large, etc., to achieve significant compatibilization effect, simple preparation process, and low raw material cost

Active Publication Date: 2020-03-20
ANHUI UNIVERSITY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the kinetic compatibility between NR and EPDM is not very good, and the vulcanization speed of the two is quite different. Only through simple mechanical blending, the blend will undergo significant phase separation during vulcanization, making the blend vulcanization The physical and mechanical properties of the glue are relatively poor

Method used

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  • Preparation of rubber blended macromolecular compatibilizer and application of rubber blended macromolecular compatibilizer in NR/EPDM alloy elastomer
  • Preparation of rubber blended macromolecular compatibilizer and application of rubber blended macromolecular compatibilizer in NR/EPDM alloy elastomer
  • Preparation of rubber blended macromolecular compatibilizer and application of rubber blended macromolecular compatibilizer in NR/EPDM alloy elastomer

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The raw material composition of the macromolecule compatibilizer in this embodiment is: 100 parts of NR raw rubber, 5% of grafting agent COD, 1% of lubricant B stearic acid, and 0.2% of initiator C benzoyl peroxide.

[0027] In this embodiment, the macromolecule compatibilizer is prepared according to the following steps:

[0028] ⑴Plasticate NR raw rubber and grafting agent A in the open mill first, then add the masticated NR, grafting agent, lubricant B, and initiator C to the open mill in sequence, and adjust the distance between the rollers to 2mm, roll temperature 30-40°C, make triangular bags 5 times on the left and right sides, and thinly pass the sheet to get the masterbatch M 1 ;

[0029] ⑵The masterbatch M 1 After cutting into pieces of comparable size, add it to the internal mixer, set the temperature at 100°C, the speed at 60rad / min, and the mixing time for 10min to obtain the macromolecular compatibilizer NR-g-COD 1 (codenamed COD-1).

Embodiment 2

[0031] The raw materials of the macromolecule compatibilizer in the present embodiment consist of: 100 parts of NR raw rubber, 10% of grafting agent COD, 1% of lubricant B stearic acid, 0.2% of initiator C benzoyl peroxide, masterbatch for M 2 .

[0032] Macromolecule compatibilizer NR-g-COD in the present embodiment 2 (Code name COD-2) preparation process is the same as embodiment 1.

Embodiment 3

[0034] The raw materials of the macromolecule compatibilizer in the present embodiment consist of: 100 parts of NR raw rubber, 15% of grafting agent COD, 1% of lubricant B stearic acid, 0.2% of initiator C benzoyl peroxide, masterbatch for M 3 .

[0035] Macromolecule compatibilizer NR-g-COD in the present embodiment 3 (Code name COD-3) the preparation process is the same as embodiment 1.

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Abstract

The invention discloses preparation of a rubber blended macromolecular compatibilizer and application of the rubber blended macromolecular compatibilizer in an NR / EPDM alloy elastomer. The rubber blended macromolecular compatibilizer is obtained by grafting a COD branched chain onto natural rubber (NR) through a high-temperature thermodynamic grafting method. The main chain of the macromolecular compatibilizer is of an NR structure, so the main chain is completely compatible with the NR; and a grafted branched chain structure is similar to an EPDM structure, so the branched chain is almost completely compatible with the EPDM. Therefore, when the compatibilizer NR-g-COD with the amphiphilic structure is added into the blend rubber of NR and EPDM according to a certain ratio, the phase domain size of an EPDM dispersion phase can be effectively reduced, the two-phase contact interface area of the NR and the EPDM is increased, and the dynamic compatibility of the NR rubber and the EPDM rubber is enhanced; and thus, the physical and mechanical properties of the blend rubber are improved.

Description

technical field [0001] The invention relates to the preparation of a macromolecule compatibilizer for rubber and its application in NR / EPDM alloy elastic body. The macromolecular compatibilizer of the present invention can be used as the compatibilizer when blending natural rubber NR and EPDM to make NR / EPDM alloy elastomers, to improve the dynamic phase of natural rubber and EPDM Capacitance. Background technique [0002] The main chain of natural rubber (NR) is composed of cis-1,3-isoprene through 1,4 addition polymerization, and is linear. Each of its structural units has a double bond and a non-polar side methyl group with little steric hindrance, so the macromolecular chain structure of NR is relatively regular, non-polar, good flexibility, and the glass transition temperature Tg is low , and is easy to crystallize when stretched, so NR vulcanized rubber has excellent comprehensive physical and mechanical properties such as resilience, electrical insulation, and bendi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F299/00C08L7/00C08L23/16C08L55/00
CPCC08F299/00C08L7/00C08L23/16C08L2205/08C08L2205/03C08L55/00
Inventor 夏茹钱坤钱家盛章于川李方山吴兵曹明方胜阳伍斌
Owner ANHUI UNIVERSITY