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Lignin/butadiene styrene rubber composite solid particle and synthesis method thereof

A technology of styrene-butadiene rubber and solid particles, which is applied in the field of rubber composite materials, can solve the problems of small particle size of lignin/styrene-butadiene rubber composite materials, equipment failure, and lack of cross-linking characteristics, so as to improve the thermal oxidation resistance. Effects of aging properties, reduced equipment failure and rubber loss, good physical and mechanical properties and resistance to thermal oxidative aging

Active Publication Date: 2022-05-03
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, when carrying out liquid-phase co-precipitation of lignin / styrene-butadiene rubber composite materials, due to the introduction of lignin molecules, on the one hand, there is a situation of coating rubber particles; on the other hand, lignin itself does not have cross-linking properties, which reduces the The cross-linking between the normal rubber particles leads to the particle size of the obtained lignin / styrene butadiene rubber composite material being too small, and glue leakage will occur during the subsequent drying process in the belt drying oven (the rubber particles will pass through the chain belt gap falling in the middle), flying rubber (colloid particles are blown up by the dry air flow), causing equipment failure and rubber loss
Therefore, how to solve the problem of colloidal particles being too small in the liquid phase co-precipitation process of lignin / styrene-butadiene rubber composites has not yet been reported.

Method used

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  • Lignin/butadiene styrene rubber composite solid particle and synthesis method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0041] (1) Dissolve 10g of alkali lignin in 100g of 2wt% sodium hydroxide solution, then add 1.9g of phenol and 3g of 37wt% formaldehyde solution, and stir for 2 hours at 80°C and 500rpm; 10% of styrene-butadiene rubber latex with a solid content of 24wt% was added, and the stirring reaction was continued for 5 minutes to obtain a mixed solution.

[0042] (2) Configure a sodium chloride solution with a concentration of 0.2wt%. According to the mass ratio of the electrolyte solution to the mixed solution in step (1) of 2:1, under the conditions of 60°C and 150r / min, mix the mixed solution at 10mL / s The speed is added to the sodium chloride solution, and the sulfuric acid solution with a concentration of 10wt% is added at the same time to keep the pH value of the whole system between 3-5. After the reaction, use 10-mesh and 200-mesh stainless steel screens to filter and separate the lignin / styrene-butadiene rubber composite solid particles in an overlapping manner, wash with wat...

Embodiment 2

[0044] (1) Dissolve 10g of alkali lignin in 100g of 1wt% potassium hydroxide solution, then add 1.3g of phenol and 2.1g of 37wt% formaldehyde solution, and stir for 2 hours at 60°C and 100rpm; 5% of the rubber mass was added to styrene-butadiene rubber latex with a solid content of 20wt%, and the stirring reaction was continued for 5 minutes to obtain a mixed solution.

[0045] (2) Configure a potassium chloride solution with a concentration of 0.1wt%, according to the mass ratio of the electrolyte solution and the mixed solution at 1:1, add the mixed solution at a rate of 5mL / s at 30°C and 50r / min In potassium chloride solution, add the sulfuric acid solution of concentration 1wt% simultaneously, keep whole system pH value between 3-5. After the reaction, use 10-mesh and 200-mesh stainless steel screens to filter and separate the lignin / styrene-butadiene rubber composite solid particles in an overlapping manner, wash with water to neutrality, and recover the composite particl...

Embodiment 3

[0047] (1) Dissolve 10g of alkali lignin in 20g of 10wt% sodium hydroxide solution, then add 3.2g of phenol and 4.7g of 37wt% formaldehyde solution, stir and react at 90°C and 1000rpm for 3h; Add styrene-butadiene rubber latex with a solid content of 30wt% to 30% of the mass of styrene-butadiene rubber, and continue to stir and react for 10 minutes to obtain a mixed solution.

[0048] (2) Configure a sodium sulfate solution with a concentration of 1.0wt%. According to the mass ratio of the electrolyte solution to the mixed solution in step (1) of 3:1, under the conditions of 80°C and 300r / min, mix the mixed solution at a rate of 30mL / s Add the sodium sulfate solution at a high speed, and add the sulfuric acid solution with a concentration of 20wt% at the same time to keep the pH value of the whole system between 3-5. Filter and separate phenolic resin modified lignin / styrene-butadiene rubber composite solid particles, wash with water until neutral, and dry lignin / styrene-butad...

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Abstract

The invention relates to lignin / styrene-butadiene rubber composite solid particles and a synthesis method thereof, and the synthesis method comprises the following steps: dissolving lignin in alkali liquor, adding phenol and a formaldehyde solution for reaction, and adding styrene-butadiene rubber latex for continuous reaction after the reaction is completed to obtain mixed liquor; and adding the mixed solution and the inorganic acid solution into the electrolyte solution to react, separating out solid composite particles, filtering, washing and drying to obtain the product. The proportion of the composite solid particles with the particle size larger than 10 meshes is 95 wt% or above, and after lignin-based styrene butadiene rubber is prepared through mixing, the lignin-based styrene butadiene rubber has good comprehensive use performance.

Description

technical field [0001] The invention belongs to the field of rubber composite materials, and in particular relates to a lignin / styrene-butadiene rubber composite solid particle and a synthesis method thereof. Background technique [0002] Styrene-butadiene rubber (SBR) is a random copolymer of butadiene and styrene. It is the largest variety of synthetic rubber, the backbone product of the rubber industry, and one of the earliest rubbers to achieve industrial production. However, since styrene-butadiene rubber is a non-self-reinforcing rubber, it must be used in conjunction with reinforcing agents, and commonly used reinforcing agents include carbon black, silica, organic resins, and lignin, among which lignin is a compound with an aromatic ring structure. Natural organic polymers are second only to cellulose in nature, but so far humans have not found a way to utilize industrial lignin as a resource. More than 95% of lignin is directly discharged into rivers or concentrate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L9/06C08L97/00C08H7/00C08J3/00
CPCC08L9/06C08H6/00C08J3/005C08L2201/08C08J2309/06C08J2497/00C08L97/005Y02T10/86
Inventor 张通白毓黎白富栋李澜鹏彭绍忠乔凯孙龙刚贾凤玲焦胜成
Owner CHINA PETROLEUM & CHEM CORP
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