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Preparation method of limonene-isoprene antiwear rubber and obtained product

A technology of isoprene and wear-resistant rubber is applied in the field of preparation of isoprene binary rubber to achieve the effects of improving tensile properties, improving wear resistance and good wear resistance

Active Publication Date: 2015-12-16
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] But these modifications are only aimed at a certain aspect of isoprene rubber, improving the wear resistance of isoprene rubber and overcoming the defects of its heat resistance and ozone aging resistance, and improving its comprehensive performance have not been reported.

Method used

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  • Preparation method of limonene-isoprene antiwear rubber and obtained product
  • Preparation method of limonene-isoprene antiwear rubber and obtained product
  • Preparation method of limonene-isoprene antiwear rubber and obtained product

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] 1) Deionized water, emulsifier sodium dodecylbenzenesulfonate (SDBS), electrolytes KCl and K 3 PO 4 , monomer isoprene (IP) and limonene (LIM) are sequentially added into the pressure reactor to obtain a polymerization system.

[0037] Wherein, 250 g of deionized water was added, the total mass of the monomer was 100 g, and the mass ratio of isoprene (IP) to limonene (LIM) was 1:1. The added amount of SDBS accounts for 2% of the total mass of the monomer, the mass of potassium chloride accounts for 0.5% of the total mass of the monomer, and the mass of potassium phosphate accounts for 0.2% of the total mass of the monomer. The addition amount of the initiator potassium persulfate accounts for 0.2% of the total mass of the monomers.

[0038] 2) Treat the reactor containing the polymerization system with N 2 Evacuate 5 times to get rid of the air in the reactor. Then the reactor was heated to 30°C, the pressure inside it was adjusted to 1MPa, under N 2 Pre-emulsifica...

Embodiment 2-5

[0046] In order to study the effect of different feed ratios on the copolymerization product PLIP, the total number of monomers was selected as 100 parts, and the mass ratios of isoprene and limonene were 9:1, 8:2, 7:3, 6:4, and other reactions The conditions are: the total mass of the monomer is 100g, deionized water 250g, SDBS2g, KCl0.5g, K 3 PO 4 0.2g, K 2 S 2 o 8 0.25g.

[0047] Put the above polymerization system at 30℃ and 1MPa N 2 Pre-emulsify for 1 hour under atmosphere, then raise the temperature to 70° C., and react for 6 hours. After the reaction, the rubber was demulsified and coagulated with a calcium chloride solution with a concentration of 4 wt %, washed repeatedly with deionized water, and dried to obtain a copolymerized product.

[0048] Determination of the molecular weight and molecular weight distribution of PLIP, the test results are shown in Table 1, and the change of the copolymerization composition of PLIP with the feed ratio is shown in Table 2 ...

Embodiment 6-9

[0055] In order to study the effect of different initiator dosage on the copolymerization product, choose K 2 S 2 o 8 The dosage is 0.1g, 0.2g, 0.3, 0.5g.

[0056] Other reaction conditions are: deionized water 250g, SDBS2g, KCl0.5g, K 3 PO 4 0.2g, IP80g, LIM20g.

[0057] Put the above polymerization system at 30℃ and 1MPa N 2 Pre-emulsify for 1 hour under atmosphere, then raise the temperature to 70° C., and react for 6 hours. After the reaction, the rubber was demulsified and coagulated with a calcium chloride solution with a concentration of 2wt%, washed repeatedly with deionized water, and dried to obtain a copolymerized product, and the conversion rate was calculated. Measure the molecular weight of product with Gel Permeation Chromatography, and the results are shown in Table 3:

[0058] Table 3. Effect of initiator dosage on copolymerization product

[0059]

[0060] When the mass concentration of the initiator is 0.5%, the conversion rate of 95% can be reach...

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Abstract

The invention provides a preparation method of limonene-isoprene antiwear rubber. The preparation method comprises the following steps: 1, sequentially adding deionized water, emulsifier, electrolyte and monomer into a reaction kettle as a polymerizatoin system, conducting pre-emulsion reaction, and obtaining a pre-emulsified solution; 2, adding initiator into the pre-emulsified solution, conducting reaction for two to ten hours, and obtaining a first reaction solution; 3, adopting a calcium chloride solution for conducting demulsification, and coagulating out rubber; 4, dissolving solvent used for binary copolymer rubber, and obtaining a rubber solution; 5, sequentially adding the rubber solution and catalysts into a pressure reaction kettle, conducting hydrogenation on the rubber, and obtaining a second reaction solution; 6, adopting absolute ethyl alcohol for conducting demulsification on the second reaction solution, and coagulating out the rubber. According to the preparation method of the limonene-isoprene antiwear rubber, the copolymerization is conducted on isoprene and limonene through a method of emulsion polymerisation, solution hydrogenation is further conducted on the obtained copolymer, and part of unsaturated double bonds are eliminated, so that the obtained isoprene functional rubber has good wear resistance, heat resistance and anti-ozone-aging performance.

Description

technical field [0001] The invention belongs to the field of organic polymer compounds, and in particular relates to a preparation method of isoprene binary rubber and the obtained product. Background technique [0002] Isoprene rubber has excellent comprehensive properties. It has similar chemical composition, three-dimensional structure and mechanical properties to natural rubber, as well as good raw rubber strength, basic viscosity, cold resistance and resilience. Any rubber that uses natural rubber Products, polyisoprene rubber can be used. [0003] The chemical structure of isoprene rubber is based on isoprene, and the molecular chain is mostly flexible carbon-carbon double bonds, but lacks rigidity. The existence of a large number of irregular double bonds also greatly affects the resistance of isoprene rubber. Thermal and ozone aging resistance, which directly affects its further application. In order to improve the shortcomings of isoprene rubber and broaden its ap...

Claims

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Application Information

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IPC IPC(8): C08F236/08C08F210/14C08F2/26C08F8/04C08C1/15
Inventor 岳冬梅陈伟雄王泽汉张立群
Owner BEIJING UNIV OF CHEM TECH
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