Alkylsiloxane-olefin random copolymer and its preparation method and application

A technology of alkyl siloxane and random copolymer, which is applied in the field of alkyl siloxane-olefin random copolymer and its preparation, can solve the problems of poisoning transition metal catalysts, etc., and achieve easy structure and good compatibility , good flexibility

Active Publication Date: 2017-05-31
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the coordination copolymerization of olefins with traditional siloxanes remains challenging due to the strong polarity of siloxane monomers, which tend to poison transition metal catalysts and deactivate them.

Method used

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  • Alkylsiloxane-olefin random copolymer and its preparation method and application
  • Alkylsiloxane-olefin random copolymer and its preparation method and application
  • Alkylsiloxane-olefin random copolymer and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] (1) Add 92g (0.69mol) tetramethyldisiloxane, 25.6g (0.23mol) 1-octene and 50g toluene to a 250mL flask equipped with a magnetic stirrer, condensing reflux device and gas inlet tube. After the device is filled with nitrogen, add 0.067g (30ppm) Karstedt catalyst solution (the mass concentration of platinum is 2%), heat to 60-80°C and stir for 8h. After the device is cooled, post-treatment removes unreacted tetramethyldisiloxane, toluene and Karstedt catalyst, and the obtained colorless transparent liquid is monohydrogen-terminated alkylsiloxane. The conversion rate was 47%. According to the characterization of the hydrogen NMR spectrum, it can be seen that in the monohydrogen-terminated alkylsiloxane, b=1 and c=4.

[0038] (2) Add 50g (0.2mol) of monohydrogen-terminated alkylsiloxane obtained in step (1), 67.1g (0.61mol) of 1,7-octadiene and 50g of toluene to a device equipped with a stirrer, condensing In the flask of the reflux device and the inlet pipe, when the devi...

Embodiment 2

[0041] Repeat the steps of Example 1, except that the amount of double-bond-terminated alkylsiloxane added in step (3) is 11.4 g (320 mmol / L). The final product was confirmed as a random copolymer with alkylsiloxane branches and olefin backbone by H NMR and IR spectroscopy. According to nuclear magnetic analysis, the molar content of the alkylsiloxane component in the copolymer is 7.8%. The copolymer had a Mw of 42400 g / mol as determined by GPC analysis.

Embodiment 3

[0043] The procedure of Example 1 was repeated except that the siloxane added in step (1) was 1,1,3,3,5,5-hexamethyltrisiloxane (143.5 g, 0.69 mol). The product of step (1) is monohydrogen-terminated alkylsiloxane. The conversion rate was 45%. It can be seen from the characterization of the hydrogen NMR spectrum that b=2 and c=4 in the monohydrogen-terminated alkylsiloxane.

[0044] The addition amount of the monohydrogen-terminated alkylsiloxane in step (2) becomes 63.7 g (0.2 mol). The product of step (2) is the double bond-terminated alkylsiloxane. The conversion rate was 57%. It can be seen from the characterization of the hydrogen NMR spectrum that a=4, b=2, and c=4 in the double bond-terminated alkylsiloxane.

[0045] The addition amount of the double-bond-terminated alkylsiloxane in step (3) becomes 6.9 g (160 mmol / L). The final product was confirmed as a random copolymer with alkylsiloxane branches and olefin backbone by H NMR and IR spectroscopy. According to nu...

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Abstract

The invention discloses an alkyl siloxane-olefin random copolymer as well as a preparation method and an application thereof. The structure of the alkyl siloxane-olefin random copolymer is shown in formula (I), wherein R refers to C1-C8 alkyl groups or phenyl groups, the value of m ranges from 1.5 to 200, the value of n ranges from 150 to 2000, the ratio of m to n ranges from 0.01 to 0.1, a is an integer between 0 and 8, b is an integer between 1 and 9, and c is an integer between 0 to 8. The alkyl siloxane-olefin random copolymer is used as a polyolefin processing modifier, can effectively improve the flowing property of a product, and does not affect and even improves the mechanical property of the product.

Description

technical field [0001] The invention belongs to the field of processing modifiers, and in particular relates to an alkylsiloxane-olefin random copolymer and its preparation method and application. Background technique [0002] Polysiloxane has excellent high and low temperature resistance, extremely low surface tension, and good dielectric properties. It can be used as a processing modifier, surface modifier, flame retardant, etc., and has broad application prospects. However, due to the poor compatibility between polysiloxane and carbon-based materials, polysiloxane is easy to migrate to the surface of the material; and polysiloxane has poor mechanical properties, which may affect the overall performance of the material. Applications in the field of plastics processing. [0003] Polyolefin is the most widely used general-purpose plastic because of its low price and good overall performance. Combining polysiloxane and polyolefin to form a polysiloxane-polyolefin blend or c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F210/02C08F230/08C08L23/06C08L23/08
Inventor 范宏金震田保政刘智颖
Owner ZHEJIANG UNIV
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