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Sulfur-modified neoprene, method for preparing same and applications

A neoprene, sulfur-adjusted technology, applied in mechanical equipment, transmission belts, V-belts, etc., can solve the problems of low tensile strength, poor flexural crack resistance, poor Mooney viscosity stability, etc., to improve processing performance , good mechanical properties and processing properties, the effect of improving structure and composition

Active Publication Date: 2008-10-15
重庆化医长寿化工集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When this kind of chloroprene rubber is used in the manufacture of automobile transmission belts, power conveyor belts and other products, there are disadvantages such as low tensile strength and poor stability of Mooney viscosity, resulting in poor rubber processing performance.
That is to say, the crystallization speed of this kind of chloroprene rubber is fast, the softening time of the prepared raw rubber, rubber compound and vulcanized rubber is short, and the flexing time of the vulcanized rubber is short, especially at low temperature, the friction performance and viscosity retention are poor; in addition, the vulcanized rubber Defects such as poor resilience, poor tear strength, poor flex crack resistance and poor crystallization resistance also affect the dynamic performance of the product, so it is far from meeting the needs of users

Method used

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  • Sulfur-modified neoprene, method for preparing same and applications
  • Sulfur-modified neoprene, method for preparing same and applications
  • Sulfur-modified neoprene, method for preparing same and applications

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Embodiment 1: a kind of sulfur adjustment type chloroprene rubber, it is characterized in that it is the copolymer of chloroprene, 2,3-dichlorobutadiene and sulfur, each component distribution ratio and terminator in its polymerization reaction The group distribution ratio is shown in Table 5.

[0049] Each component distribution ratio (by weight) of polymerization reaction in the embodiment 1 of table 5

[0050]

[0051] The preparation method of above-mentioned sulfur adjustment type chloroprene rubber, it may further comprise the steps:

[0052] a, at first according to the proportioning of table 5, each component in the oil phase is chloroprene, 2,3-dichlorobutadiene, regulator sulfur and disproportionated rosin are mutually dissolved completely, and according to the proportioning of table 5, the water The components in the phase, that is, co-emulsifier sodium petroleum sulfonate and sodium lauryl sulfate, dispersant sodium alkylnaphthalene sulfonate, sodium hyd...

Embodiment 2

[0057] Example 2: A sulfur-adjusted chloroprene rubber, wherein the distribution ratio of each component in the polymerization reaction and the component distribution ratio of the terminator are shown in Table 6.

[0058] Each component distribution ratio (by weight) of the polymerization reaction in the embodiment 2 of table 6

[0059]

[0060] The preparation method of the above-mentioned sulfur-modified chloroprene rubber, wherein the polymerization reaction temperature is 20-25 ° C, and the rest are the same as in Example 1.

[0061] The weight-average molecular weight of the above-mentioned sulfur-adjusted chloroprene rubber is 107341, and the number-average molecular weight is 53538, which are determined by the same method and standard as in Example 1. In addition, the brittleness temperature measured by GB / T 15256-1994 low-temperature brittleness of vulcanized rubber is -40°C.

Embodiment 3

[0062] Embodiment 3: A sulfur-adjusted chloroprene rubber, wherein the distribution ratio of each component in the polymerization reaction and the component distribution ratio of the terminator are shown in Table 7.

[0063] Each component distribution ratio (by weight) of the polymerization reaction in the embodiment 3 of table 7

[0064]

[0065]

[0066] The preparation method of the above-mentioned sulfur-modified chloroprene rubber, wherein the polymerization reaction temperature is 25-30° C., and the rest are the same as in Example 1.

[0067] The weight-average molecular weight of the above-mentioned sulfur-adjusted chloroprene rubber is 136258, and the number-average molecular weight is 62849, which are determined by the same method and standard as in Example 1. In addition, according to GB / T 15256-1994 measurement standard of low-temperature brittleness of vulcanized rubber, the brittleness temperature is -41°C.

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Abstract

The invention provides sulfur modified neoprene rubber, which is characterized in that the neoprene rubber is the multipolymer of chloroprene, 2, 3-dichloroprene and sulphur. The multipolymer is made up of the constitutional repeating units; moreover, the multipolymer has a weight average molar mass between 80000 and 150000, a number average molecular weight between 35000 and 70000 and a brittleness temperature between 38 DEG C below zero and 42 DEG C below zero; the multipolymer is made by polymerizing 100 weight portions of chloroprene, 2 to 30 weight portions of 2, 3- dichloroprene and 0.5 to 0.8 weight portion of sulfur by latex, wherein, the polyreaction temperature is between 20 and 45 DEG C, in the formula, n is an integer between 80 and 100, m is an integer between 2 and 10 and x is an integer between 2 and 6. The sulfur modified neoprene rubber embodies good machining performance in the aspects such as the tensile-strength, the crystallization velocity and the stability of the Mooney viscosity; in addition, the sulfur modified neoprene rubber has good rebound resilience, peeling strength, anti-tensile and chap property, antigraining performance and forming binding property, therefore, the dynamic property of the product is superior to that of the neoprene rubber of the prior art. The invention also provides a method for making the neoprene rubber and an application to the manufacture of a car transmission belt and a power conveyer belt.

Description

technical field [0001] The invention relates to a sulfur-adjusted neoprene rubber, its preparation method and its application in the manufacture of transmission belts, power transmission belts and other products. Background technique [0002] The existing sulfur-adjusted chloroprene rubbers on the market are all polymerized with chloroprene monomers. When this kind of chloroprene rubber is used to manufacture automobile transmission belts, power conveyor belts and other products, there are disadvantages such as low tensile strength and poor stability of Mooney viscosity, resulting in poor rubber processing performance. That is to say, the crystallization speed of this kind of chloroprene rubber is fast, the softening time of the prepared raw rubber, rubber compound and vulcanized rubber is short, and the flexing time of the vulcanized rubber is short, especially at low temperature, the friction performance and viscosity retention are poor; in addition, the vulcanized rubber ...

Claims

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Application Information

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IPC IPC(8): C08F236/18C08F2/38C08F2/24F16G1/06F16G5/04
Inventor 张阜东戴祖宏邓明红
Owner 重庆化医长寿化工集团有限公司
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