A kind of preparation method of coordination cross-linked rubber containing crystal water metal salt

A technology of coordination cross-linking and metal salt, applied in the field of coordination and cross-linking of rubber, can solve the problem of deteriorating compatibility between metal salts and rubber, high activation energy of coordination cross-linking reaction, uneven coordination and cross-linking reaction, etc. problems, to achieve the effects of improving wettability and blending uniform dispersion, increasing melting and ionization probability, and improving coordination and crosslinking efficiency

Active Publication Date: 2016-08-24
QUANGANG PETROCHEM RES INST OF FUJIAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, crystallization water exists in the metal salt coordination crosslinking agent, which brings the following fatal problems to the existing coordination crosslinking rubber method: (1) crystallization water will break away from self-association at high temperature to form a polar phase or dissociate from the metal salt The surface forms a polar liquid film through hydrogen bonding, so it is easy to deteriorate the compatibility between the metal salt and the rubber, making it difficult to blend the two uniformly; (2) change the surface energy so that the coordination crosslinking mainly occurs on the surface of the inorganic salt, Cause uneven coordination crosslinking reaction, slow rate and low efficiency; (3) Crystal water will volatilize during high temperature vulcanization, causing the vulcanization system to foam and changing the mechanical properties of the product
In addition, the existing coordination crosslinking rubber method still has the following common technical defects that need to be overcome: (1) The amount of coordination crosslinking agent is large, usually more than 20 parts by weight, so the product is relatively brittle, and it is difficult to achieve high strength and high toughness (2) The activation energy of the coordination cross-linking reaction is relatively high, so a high-temperature coordination cross-linking vulcanization process is required
The above-mentioned problems are the reasons why it is still difficult for coordination crosslinked rubber to obtain ideal industrial applications.

Method used

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  • A kind of preparation method of coordination cross-linked rubber containing crystal water metal salt
  • A kind of preparation method of coordination cross-linked rubber containing crystal water metal salt
  • A kind of preparation method of coordination cross-linked rubber containing crystal water metal salt

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] (1) Formula

[0034]

[0035]

[0036] (2) steps

[0037] a. Low-temperature mixing: put acrylate-butadiene rubber into the internal mixer, masticate at 40°C for 1 min; then, add copper sulfate pentahydrate, silane coupling agent and octyl phthalate according to the formula, Mix evenly at 50°C to obtain low temperature mixed rubber;

[0038] b. High-temperature mixing: In the open mill, mix the obtained low-temperature rubber mixture at 110°C for 8 minutes, then add calcium oxide, continue mixing evenly, and obtain high-temperature rubber mixture;

[0039] c. Coordination cross-linking: Send the obtained high-temperature mixed rubber into the vulcanization equipment, preheat at 180°C for 1 min under normal pressure, then vulcanize at 10 MPa for 34 min, discharge, and cool to obtain a coordination cross-linked rubber.

[0040]Preparation of the comparison sample: according to the conventional method, that is, the method reported in the patent ZL200410025013.0.

...

Embodiment 2

[0048] (1) Formula

[0049]

[0050] (2) steps

[0051] a. Low-temperature mixing: put nitrile rubber into the open mill, and masticate at 35°C for 3 minutes; then, according to the formula, add aluminum sulfate octadecahydrate, white carbon black, aluminate coupling agent and liquid nitrile, Mix evenly at 45°C to obtain low temperature mixed rubber;

[0052] b. High-temperature mixing: In an open mill, mix the obtained low-temperature rubber mixture at 120°C for 5 minutes, then add zinc oxide, continue mixing evenly, and obtain a high-temperature rubber mixture;

[0053] c. Coordination cross-linking: send the obtained high-temperature mixed rubber into the vulcanization equipment, preheat at 200°C for 1.5 minutes under normal pressure, then vulcanize at 10 MPa for 25 minutes, discharge, and cool to obtain coordination cross-linked rubber.

[0054] Preparation of the comparison sample: prepared according to the conventional method, that is, the method reported in the pat...

Embodiment 3

[0063] (1) Formula

[0064] Nitrile rubber 100g

[0065] Cerium Sulfate Tetrahydrate 30g

[0066] Magnesium oxide 7.5g;

[0067] (2) steps

[0068] a. Low-temperature mixing: put nitrile rubber into the open mill, and masticate at 35°C for 2 minutes; then, add cerium sulfate tetrahydrate according to the formula, and mix evenly at 45°C to obtain low-temperature compounded rubber;

[0069] b. High-temperature mixing: In the open mill, mix the obtained low-temperature rubber mixture at 115°C for 6 minutes, then add magnesium oxide, continue mixing evenly, and obtain a high-temperature rubber mixture;

[0070] c. Coordination cross-linking: send the obtained high-temperature mixed rubber into the vulcanization equipment, preheat at 175°C for 0.5 min under normal pressure, then vulcanize at 15 MPa for 27 min, discharge, and cool to obtain coordination cross-linked rubber.

[0071] Preparation of the comparison sample: prepared according to the conventional method, that is, the...

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Abstract

The invention relates to a coordination crosslinking method of rubber, in particular to a method for preparing rubber from a metal salt containing concentration water through coordination crosslinking. In preparation, after the rubber is fed in mixing equipment to be plastified, a coordination crosslinking agent, an aging resisting agent, a reinforcing agent, a coupling agent and a plasticizer are sequentially added and uniformly mixed to obtain a low-temperature rubber compound; after the low-temperature rubber compound is mixed, a water absorbent is added, the mixture is continuously and uniformly mixed, and a high-temperature rubber component is obtained; the high-temperature rubber compound is fed in vulcanizing equipment, is preheated for 0.5-2 min at a temperature of 170-200 DEG C, and is then vulcanized for 5-35 min under 5-20 MPa, and the coordination crosslinking rubber is obtained. High-temperature mixing is adopted, so that the fusion and ionization probability of the metal salt taken as the coordination crosslinking agent is improved remarkably, and the hydrogen bonding force of free crystallization water is weakened; oxides are added to absorb the free crystallization water, so that the foaming rate during the high-temperature coordination crosslinking process is reduced remarkably, the ionization of the metal salt can be promoted, the coordination crosslinking efficiency is improved, and the consumption of the metal salt taken as the coordination crosslinking agent is beneficial for reduction.

Description

technical field [0001] The invention relates to a coordination crosslinking method of rubber, in particular to a preparation method of coordination crosslinking rubber containing crystal water metal salt. Background technique [0002] Crosslinking plays an important role in improving the properties of rubber. The traditional sulfur-containing system or peroxide covalent crosslinking can obtain polysulfide bond crosslinking structure and C-C bond covalent crosslinking structure, respectively. Compared with covalent crosslinking, coordination crosslinking obtains a coordination bond crosslinking structure, which has the following advantages: (1) The coordination bond can simultaneously have the good heat resistance of the C-C bond and the stress resistance similar to the polysulfide bond. (2) The coordination cross-linking structure can endow the coordination cross-linking rubber with reversible thermoplastic high elasticity, making it thermoplastic, which is beneficial to re...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08K13/02
Inventor 曹长林陈庆华钱庆荣汪扬涛黄宝铨蔡聪育
Owner QUANGANG PETROCHEM RES INST OF FUJIAN NORMAL UNIV
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