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Unimodal radial block copolymer possessing random graded chain and its preparation method

A block copolymer, radial technology, applied in the field of monomorphic radial block copolymer and its preparation, can solve the problems of long feeding time, inconspicuous gradient process, prolonging the feeding time of butadiene, etc., and achieve random The effect of high degree of chemicalization and avoiding gel or other side effects

Inactive Publication Date: 2006-03-29
PETROCHINA CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The operating temperature of this process is too high, prone to side reactions and gelation
[0004] Synthesis of a transition segment in a copolymer of monovinylarene and conjugated diene, WO96 / 25442 reports the formation of a transition segment by prolonging the feeding time of butadiene, from continuous feeding of butadiene to discontinuous feeding, and discontinuous feeding of styrene It is obtained by changing the method of continuous feeding and controlling the polymerization temperature. This method takes a long time to feed, and it is necessary to realize alternate control, which is not conducive to industrial production.
Patents EP761704A1, US5399628, etc. refer to the synthesis of the gradient section. In the synthesis of styrene and butadiene, they are mixed in a certain proportion, added at one time, and reacted at a constant temperature. The gradient section obtained by this method has a low degree of randomness and the gradual change process is not obvious. , affecting product performance

Method used

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  • Unimodal radial block copolymer possessing random graded chain and its preparation method
  • Unimodal radial block copolymer possessing random graded chain and its preparation method
  • Unimodal radial block copolymer possessing random graded chain and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～10

[0043] In a jacketed 14L stainless steel reactor, the polymerization was carried out in a hydrocarbon solvent under the protection of argon. Continuous stirring of the reaction mixture is required during polymerization and coupling. Adding steps are as follows:

[0044] (1) monovinylarene monomer and initiator;

[0045] (2) A mixture of monovinylarene monomers and conjugated diene monomers (70% to 85% of the total weight of the mixture);

[0046] (3) A mixture of monovinylarene monomers and conjugated diene monomers (the remaining 15% to 30% mixture);

[0047] (4) conjugated diene monomer;

[0048] (5) Coupling agent.

[0049] After the coupling reaction is complete, water and CO 2 The coupled reaction mixture is treated and antioxidants are added prior to obtaining the polymer xylk of the invention. Table 1 shows the types of raw materials and additives used in Examples 1-10, and Table 2 shows the formulations and process conditions for preparing the copolymers of the p...

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Abstract

The invention provides a unimodal radial block copolymer possessing random graded chain and its preparation method, wherein the structure is illustrated by formula R-XB#-[3]-(B#-[2]-S#-[3])B#-[1] / S#-[2]-S#-[1]]#-[3], wherein the weight portion of the single vinyl aromatic hydrocarbon monomer in the copolymer is between 30-95%, wherein the weight portion of the conjugated diolefin hydrocarbon monomer is between 5-70%. This polymer has very high transmittance and fine shock resistant intensity.

Description

technical field [0001] The invention relates to a single-morphological radial block copolymer containing random gradient segments and a preparation method thereof, in particular to a highly transparent, impact-resistant single-morphology radial or block copolymer with random gradient segments. It is called star block copolymer and its preparation method. Background technique [0002] In the prior art, there are many related documents reporting on butadiene-styrene block copolymers, such as EP0492490, US 4925899, US 5130377, CN 85100418 and so on. Patent CN 1073950 reports a method for preparing a butadiene-styrene block copolymer. The initiator is added once, and the copolymer is obtained through a coupling reaction, but the molecular chain of the copolymer does not contain a gradient segment, so the coupling efficiency is low , the coupling reaction time is long. The butadiene-styrene block copolymers reported in US 4925899, US 5130377, and CN 85100418 are polymorphic or ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F297/04
Inventor 龚光碧吕爱新杜正银陶惠平贺琼玉陈建刚杨绮波李毅郭义张银娥
Owner PETROCHINA CO LTD
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