Method for preparing epoxidized styrene-isoprene-phenylethene block copolymer and use thereof

A technology for epoxidizing styrene and styrene blocks, used in thermoplastic elastomer applications, epoxidation of styrene-isoprene-styrene block copolymers, can solve side reactions, easy decomposition, The epoxidized polymer has a low degree of epoxidation, which can achieve the effect of strong adhesion and good oil resistance

Active Publication Date: 2008-07-30
广东宏昌新材料科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the preparation method of above-mentioned epoxidized polymer, there is main shortcoming and be: (1) used peroxyacid (as peroxyformic acid, peroxyacetic acid etc.) epoxidation, and are prone to safety accidents, and are not suitable for industrial production; (2) the epoxidation degree of the prepared epoxidized polymer is not high, and more side reactions occur during the epoxidation reaction

Method used

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  • Method for preparing epoxidized styrene-isoprene-phenylethene block copolymer and use thereof
  • Method for preparing epoxidized styrene-isoprene-phenylethene block copolymer and use thereof

Examples

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Embodiment 2

[0037] Example 2. As shown in Table 1, the influence of the mass ratio of different hydrogen peroxide solutions and elastomers on the epoxy mass fraction of epoxidized styrene-isoprene-styrene block copolymers is shown. The preparation method of epoxidized styrene-isoprene-styrene block copolymer is similar to embodiment 1, the difference is only: by changing hydrogen peroxide solution and styrene-isoprene-styrene block copolymerization According to the mass ratio of epoxidized styrene-isoprene-styrene block copolymer, the change of epoxy group mass fraction is obtained. Table 1 shows the effect of different mass ratios of hydrogen peroxide solution and elastomer on the mass fraction of epoxy groups in epoxidized styrene-isoprene-styrene block copolymers. It can be seen that as the mass ratio of hydrogen peroxide solution to elastomer increases, the mass fraction of epoxy groups in epoxidized styrene-isoprene-styrene block copolymer increases rapidly. When the mass ratio is 9...

Embodiment 3

[0040] Embodiment 3. represented the mass ratio of polyethylene glycol and styrene-isoprene-styrene block copolymer to epoxidized styrene-isoprene-styrene block copolymerization as shown in table 2 The effect of the epoxy group mass fraction of the compound. The preparation method of epoxidized styrene-isoprene-styrene block copolymer is similar to that of Example 1, the only difference is that changing the amount of formic acid is 4.5g, by changing polyethylene glycol and styrene-isoamyl The mass ratio of the diene-styrene block copolymer was obtained to obtain the change of the epoxy group mass fraction of the epoxidized styrene-isoprene-styrene block copolymer. It can be seen that as the mass ratio of polyethylene glycol to styrene-isoprene-styrene block copolymer increases, the ring of epoxidized styrene-isoprene-styrene block copolymer The oxygen mass fraction first increased and then decreased. When the mass ratio is 2:100, the mass fraction of epoxy groups in the epox...

Embodiment 4

[0045] Example 4. As shown in Table 3, the influence of different reaction times on the mass fraction of epoxy groups in epoxidized styrene-isoprene-styrene block copolymers is shown. The preparation method of the epoxidized styrene-isoprene-styrene block copolymer is similar to that of Example 1, except that the amount of formic acid is changed to 4.5 g, and the amount of polyethylene glycol is changed to 3 g. It can be seen from Table 3 that with the prolongation of the reaction time, the mass fraction of epoxy groups in the epoxidized styrene-isoprene-styrene block copolymer first increases and then decreases. When the reaction time was 2.5 hours, the mass fraction of epoxy groups in the epoxidized styrene-isoprene-styrene block copolymer reached a maximum value of 15.3%. This is because formic acid as a catalyst is a strong acid. When the reaction time is too long, it will work together with hydrogen peroxide to cause ring-opening side reactions of the epoxy group, resulti...

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Abstract

The invention relates to a preparation method of epoxidized styrene-isoprene-cinnamene block copolymer. In organic solvent, polyethylene glycol is taken as phase transfer catalyst, the styrene-isoprene-cinnamene block copolymer is epoxidized through organic peroxy acid generated by organic acid and hydrogen peroxide in situ, to ensure that double bonds on a polyisoprene chain segment are transformed into epoxy radical, and then sodium hydroxide solution is added to neutralize the system, simultaneously, antioxidant is added to prevent the epoxidized styrene-isoprene-cinnamene block copolymer from being oxidized, and after azeotropy, the organic solvent is removed through vaporization to obtain the epoxidized styrene-isoprene-cinnamene block copolymer. The used solvent can be circularly utilized. The epoxidized styrene-isoprene-cinnamene block copolymer prepared with the method is provided with certain polarity and cohesive strength, the adhesion property to the polar material is strong, the oil resistance is good, and the epoxidized styrene-isoprene-cinnamene block copolymer can be used as thermoplastic elastomer to prepare hot melt pressure-sensitive and adhesive sealant, etc.

Description

technical field [0001] The present invention relates to a kind of preparation method of epoxidized styrene-isoprene-styrene block copolymer, especially relate to the epoxidation method of styrene-isoprene-styrene block copolymer, described Epoxidized styrene-isoprene-styrene block copolymers are used as thermoplastic elastomers. Background technique [0002] Styrene-isoprene-styrene block copolymer is a new generation of thermoplastic elastomer developed and industrialized by Philips Petroleum Company of the United States and Shell Chemical Company in the 1960s. However, the molecular polarity of styrene-isoprene-styrene block copolymer is small, which makes its oil resistance and solvent resistance poor, and its compatibility and adhesion with polar materials are not good, which limits its use. application range. [0003] The chemical modification of styrene-isoprene-styrene block copolymers is mainly to introduce polar groups through unsaturated double bonds, such as epo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F8/08C08F297/04
Inventor 李红强吴伟卿曾幸荣
Owner 广东宏昌新材料科技有限公司
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