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Grafting-modified rubber and preparation method thereof

A technique of grafting modified rubber, which is applied in the field of preparation of nano-silica/polyconjugated diene composite emulsion and its grafted modified rubber, which can solve the problems of easy sedimentation loss, difficult dispersion, and quality loss. Achieve good wet skid resistance, low rolling resistance and low cost

Active Publication Date: 2012-10-17
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The physical and mechanical properties and dynamic mechanical properties of the rubber compound prepared by this method are better, but a large amount of organic alcohol, cyclohexane, etc. Solvent, during the solvent removal process, the macromolecular chain is difficult to contain and aggregate all the silica particles, there will be a loss of quality, and it may also aggregate in the co-coagulation gel matrix, making it difficult to achieve good dispersion
[0005] Ye Xin et al disclosed a preparation method of silica / styrene-butadiene rubber composite material by wet compounding technology in "Rubber Science and Technology Market" 2009 No. 10. In this method, the white carbon black in the water phase The surface of carbon black is organically modified, and then mixed with styrene-butadiene latex to coagulate to prepare the modified silica / styrene-butadiene rubber composite material. The biggest advantage of this method is that the filler has better dispersion and can effectively avoid the flying of the filler. Pollution, but silica is easy to settle and lose in the wet compounding process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Nano-silica surface functional modification: Weigh 120g nano-silica and dry it in an oven for use, then mix it with 1200g toluene and ultrasonically disperse fully, add 240g of hydrolyzed VTES, stir and heat to 82°C and reflux for 2.3 hours, It is then filtered, washed and dried in vacuum.

[0050] Preparation of functional emulsion

[0051] The first step is the preparation of monomer pre-emulsion. 1,200 g of 1,3-butadiene, 120 g of sodium dodecylbenzenesulfonate, 1,800 g of deionized water, 12 g of sodium hydroxide, and 2.4 g of potassium persulfate were mixed and pre-emulsified for 20 minutes to prepare a pre-emulsion.

[0052] In the second step, the functional emulsion is prepared with the modified nano-silica as the core. Take 3.6g of nano-silica modified by surface functionalization and add it to a reactor containing 60g sodium dodecylbenzenesulfonate and 480g deionized water, stir and heat up to 60°C, and then take 313g monomer pre-emulsion Add it into the re...

Embodiment 2

[0055] According to the method disclosed in "Journal of Radiation Research and Radiation Technology", Volume 25, No. 5, "Study on Surface Modification of Nano-Silicon Dioxide and Radiation-Initiated Grafting GMA" in 2007, the nano-silicon dioxide method for surface functional modification: Weigh 6g of nano-silicon dioxide and dry it in an oven at 50°C for 5h, add the dried nano-silicon dioxide into an aqueous solution in which 96g of coupling agent MPS is dissolved, and ultrasonically disperse for 1h. After dispersion, the mixture was stirred at 110°C for 8h. After filtration, the modified silicon dioxide was washed with toluene, and the obtained product was vacuum filtered, extracted by Soxhlet, and finally dried in an oven.

[0056] Preparation of functional emulsion

[0057] The first step is the preparation of monomer pre-emulsion. 1200 g of isoprene, 72 g of sodium lauryl sulfate, 1200 g of deionized water, 6 g of ammonia water, and 9.6 g of ammonium persulfate were mix...

Embodiment 3

[0061] Surface functional modification of nano-silica: Weigh 240g of nano-silica and dry it in an oven for use, then mix it with 4800g of xylene and ultrasonically disperse fully, add 312g of hydrolyzed VTMS, stir and heat to 93°C for 4 hours to reflux , then filtered, washed, and dried in vacuum.

[0062] Preparation of functional emulsion;

[0063] The first step is the preparation of monomer pre-emulsion. Prepare by mixing 1200g of 1,3-pentadiene, 40g of sodium dodecylbenzenesulfonate, 200g of alkylphenol polyoxyethylene ether, 1920g of deionized water, 9.6g of sodium carbonate and 9.8g of sodium persulfate for 30 minutes into a pre-emulsion.

[0064] In the second step, the functional emulsion is prepared with the modified nano-silica as the core. Get 54g of surface-functionalized modified nano-silica and add it to a reactor equipped with 54g fatty acid soap and 456g deionized water, stir and heat up to 68°C, then get 676g monomer pre-emulsion and add it to the reactor,...

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Abstract

The invention discloses a grafting-modified rubber and a preparation method thereof. The grafting-modified rubber is prepared by graft polymerization of rubber latex (1) and a nano-silica / poly(conjugated diene) composite emulsion (2) in the presence of an initiator, wherein a mass ratio of the dry basis of the rubber latex to the dry basis of the nano-silica / poly(conjugated diene) composite emulsion is 100: (0.1 to 100); based on the dry basis of the nano-silica / poly(conjugated diene) composite emulsion, the nano-silica / poly(conjugated diene) composite emulsion comprises 0.1 to 5 parts of surface functionalization-modified nano-silica; the nano-silica / poly(conjugated diene) composite emulsion has granularity of 50 to 80nm, number-average molecular weight of 100000 to 120000 and molecular weight distribution of 2 to 3; and the rubber latex is a homopolymer or a copolymer containing a poly(conjugated diene) compound and is prepared by emulsion polymerization.

Description

technical field [0001] The invention relates to a graft modified rubber and a preparation method thereof, in particular to a nano silicon dioxide / polyconjugated diene composite emulsion and a preparation method of the graft modified rubber. Background technique [0002] In recent years, the preparation of organic polymer / inorganic nanoparticle composites has become one of the hot research topics in various countries. With the development of automobiles in the direction of high speed, safety, energy saving and comfort, the requirements for high performance tires are also increasing year by year, which requires tire treads to have good wet skid resistance, excellent wear resistance and low rolling resistance. [0003] Nano-silica, commonly known as white carbon black, is the second largest reinforcing agent used in the rubber industry after carbon black. Since the 1990s, silica has been widely used as a reinforcing filler in tire tread formulations, so that the above-mention...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G81/02C08K9/06C08K3/36C08L87/00
Inventor 赵志超马朋高李晓艳胡育林李波龚光碧郑聚成贾慧青王永峰梁滔秦传高翟云芳邵卫陈建刚肖晔
Owner PETROCHINA CO LTD
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