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Low cis-polybutadiene rubber and preparing method and application thereof

A technology of polybutadiene rubber and cis-polybutadiene, which is applied in the application field of resin tougheners, can solve the problems that the range of improvement needs to be further improved, and achieve the effect of reducing residues

Active Publication Date: 2017-04-26
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Studies have shown that although the low-cis polybutadiene rubber can improve the impact resistance and gloss of polystyrene resin to a certain extent, the improvement range needs to be further improved

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0021] The preparation method of the low-cis polybutadiene rubber provided by the invention comprises in the presence of an initiator and a structural regulator, butadiene is carried out in a non-polar hydrocarbon solvent for intermittent anionic polymerization, and then the anionic polymerization The product is coupled with divinylbenzene, and the molar ratio of the amount of divinylbenzene to the amount of initiator is (0.8-1.5): 1, and the conditions of the anionic polymerization and coupling reaction are such that The number-average molecular weight of the low-cis polybutadiene rubber is 80000-120000, the molecular weight distribution index is 1.4-1.9, and the content of 1,2-structure in the low-cis polybutadiene rubber is 8-20 weight %.

[0022] According to the preparation method of the low-cis-polybutadiene rubber provided by the present invention, preferably, the conditions of the anionic polymerization reaction and coupling reaction make the number-average molecular w...

Embodiment 1

[0037] This embodiment is used to illustrate the low-cis polybutadiene rubber provided by the present invention and its preparation method.

[0038] The 5-liter polymerization reactor was replaced 3 times with high-purity nitrogen, and 2200g cyclohexane (soaked with molecular sieves for 60 days, water content less than 10ppm, the same below), 0.5g tetrahydrofuran, 300g Butadiene (polymerization grade, water content less than 5ppm, the same below), heated to 50°C in a circulating water bath, and added 20mL of n-butyllithium cyclohexane solution (concentration: 0.41mol·L -1 , the same below), the highest temperature reached 92°C after 19 minutes, and the temperature dropped to 64°C after 30 minutes, and 19.5 mL of cyclohexane solution of divinylbenzene (concentration of 0.46 mol L -1 , the same below) to carry out the coupling reaction, after 1h, add a saturated aqueous solution containing 2g of carbon dioxide to terminate, and after 10min, add a composite antioxidant (a mixture...

Embodiment 2

[0040] This embodiment is used to illustrate the low-cis polybutadiene rubber provided by the present invention and its preparation method.

[0041] The 5-liter polymerization reactor was replaced with high-purity nitrogen for 3 times. Under the protection of high-purity nitrogen, 2200 g of cyclohexane, 1 g of tetrahydrofuran, and 300 g of butadiene were sequentially added to the reactor. The circulating water bath was heated to 50 ° C, and 18.8 mL of n-butyl Lithium cyclohexane solution, the highest temperature reached 91°C after 21 minutes, and the temperature dropped to 63°C after 30 minutes, adding 19.6mL of divinylbenzene in cyclohexane solution for coupling reaction, adding saturated aqueous solution containing 2g carbon dioxide after 1h To terminate, add 1g of composite antioxidant after 10 minutes, stir evenly, steam condense to remove cyclohexane, and then dry on a mill at 100°C to obtain LCBR rubber Y 2 . to Y 2Analysis and characterization were carried out, the co...

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Abstract

The invention relates to the field of polymers, and provides a low cis-polybutadiene rubber and a preparing method and application thereof. The preparing method of the low cis-polybutadiene rubber comprises the steps of conducting interval anionic polymerization reaction on butadiene in nonpolar varsol under the existence of an initiator and a structure adjusting agent, and then conducting coupled reaction between a product of the anionic polymerization reaction and divinyl benzene, wherein the mole ratio of the dosage of divinyl benzene to the dosage of the initiator is (0.8-1.5):1, so that the number-average molar mass of the obtained low cis-polybutadiene rubber is 80000-120000, the molecular weight distribution index is 1.4-1.9, and the content of 1,2-structure in the low cis-polybutadiene rubber is 8-20% by weight. The low cis-polybutadiene rubber obtained through the preparing method has a very good toughening effect, is capable of remarkably improving shock resistance and lustrousness of an ABS resin, and has a very good industrial application prospect.

Description

technical field [0001] The invention relates to a low-cis polybutadiene rubber, a preparation method of a low-cis polybutadiene rubber, a low-cis polybutadiene rubber prepared by the method, and the low-cis polybutadiene rubber Application of diene rubber as resin toughening agent. Background technique [0002] The selection of toughened rubber varieties is a key technology in ABS resin toughening. Theoretically speaking, the continuous bulk method ABS resin toughened rubber can be low cis polybutadiene rubber (LCBR rubber), high cis polybutadiene rubber, styrene-butadiene rubber, styrene-butadiene-styrene At least one of thermoplastic elastomers and the like. Toughened rubber cannot choose rubber with cross-linked structure, because cross-linked rubber cannot perform grafting reaction with the resin matrix. In the traditional bulk polymerization process, high-cis-polybutadiene rubber can be used for toughening. However, although high-cis-polybutadiene rubber has a low gl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F279/02C08F136/06C08F2/38C08F4/48C08L55/02C08L9/00
Inventor 李建成吕万树李传清王雪
Owner CHINA PETROLEUM & CHEM CORP