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Modified lignin enhanced rubber and preparation method thereof

A lignin and enhanced technology, applied in the field of rubber, can solve the problems of affecting rubber performance, high energy consumption, uneven particle size, etc.

Active Publication Date: 2020-08-14
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is by grinding lignin and unsaturated carboxylate to obtain lignin-unsaturated carboxylate, and the grinding not only consumes a lot of energy, but also produces certain dust pollution. At the same time, the grinding will cause particles Corresponding shortcomings such as uneven diameter, thus affecting the performance of rubber
At the same time, this modification method has no significant change in the force of lignin and rubber. Therefore, it is necessary to develop a new, convenient, low energy consumption, and green modification method to promote lignin in the rubber field. Applications

Method used

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  • Modified lignin enhanced rubber and preparation method thereof
  • Modified lignin enhanced rubber and preparation method thereof
  • Modified lignin enhanced rubber and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068] Embodiment 1: the preparation of modified lignin (dipping method)

[0069] Weigh the carbon-carbon double bond-containing compound and the sulfur-containing compound according to Table 1, stir and mix, add ethanol to it, the concentration of the carbon-carbon double bond-containing compound and the sulfur-containing compound are both 2g / mL, to obtain The first solution; according to Table 1, take the compound that can block the hydroxyl group, add ethanol therein, and the concentration of this substance is 2g / mL to obtain the second solution; if the compound containing carbon-carbon double bonds in Table 1 and the sulfur-containing element Compounds and compounds that can block hydroxyl groups do not need to be dissolved in ethanol, and can be used directly, and the consumption of these compounds is controlled according to the description of the following two paragraphs.

[0070] The first solution was added dropwise to 10 g of enzymatic lignin (the amount of carbon-car...

Embodiment 2

[0082] Embodiment 2: the preparation of modified lignin (air flow modification method)

[0083] According to numbers 4, 9, 10 and 12 in Table 1, the first solution and the second solution were prepared according to the same method as in Example 1.

[0084]Spray enzymatic lignin into the crushing chamber through high-pressure air at about 100°C, and at the same time, spray the first solution (flow rate of 40mL / min) into the crushing chamber through the atomizing nozzle, and the speed of the air classification wheel is 2000rpm , run for 2min; then spray the second solution (flow rate of 40mL / min) into the pulverization chamber through the atomizing nozzle, the speed of the air classification wheel is 2000rpm, run for 3min; and then separate through the cyclone separator to obtain four kinds of modified Lignin, namely ligni4, lignin9, lignin10, lignin12. The D50 of the three were 1.6 μm, 1.4 μm, 1.7 μm and 2.3 μm, respectively, through the particle size test of the US-based Mact...

Embodiment 3

[0085] Embodiment 3: Preparation of lignin-reinforced rubber

[0086] (1) Take 10g of enzymatic lignin (particle size has been air-pulverized to 2.1 μm) and the lignin4, lignin9, lignin10, lignin12, lignin13, lignin14 prepared in Example 2, 40g of natural rubber, and 10g of high wear-resistant carbon black N330 , 1g of sulfur, 0.6g of N-cyclohexyl-2-benzothiazole sulfenamide, 2g of zinc oxide and 0.8g of stearic acid were sequentially added to the internal mixer, and banburyed at 100°C for 20 minutes;

[0087] (2) Place the mixed rubber obtained in step (1) in an open mill for 7 times of thin pass, and measure its vulcanization performance with a rubber vulcanizer to obtain the normal vulcanization time t at 180°C. 90 After 3 minutes, they were molded by hot pressing at 180°C for 3 minutes with a flat vulcanizer.

[0088] Table 3 Properties of vulcanized rubber

[0089]

[0090] It can be seen from Table 3 that in the case of the same particle size, compared with unmodifi...

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Abstract

The invention discloses modified lignin enhanced rubber and a preparation method thereof. Modified lignin is prepared by carrying out composite modification on a compound containing carbon-carbon double bonds, a compound containing a sulfur element and a compound capable of sealing hydroxyl. Lignin is modified through the compound containing carbon-carbon double bonds, the contained double bonds and olefin in rubber generate a bonding effect, and the binding force of lignin and rubber is improved. Furthermore, the lignin is modified by the compound containing a sulfur element, so that the lignin contains a certain sulfur element, the acting force between the lignin and the rubber is improved, the performance of the rubber is improved, the use of a vulcanizing agent can be reduced, and thereplacement amount of the lignin to the carbon black is further increased. Besides, after the lignin is modified by the compound capable of sealing hydroxyl, the polar performance of the lignin is obviously reduced, so that the polarity of the lignin is closer to that of the rubber, the acting force between the rubber and the lignin is further improved, and the performance of the rubber is improved.

Description

technical field [0001] The invention belongs to the field of rubber, and in particular relates to a modified lignin-reinforced rubber and a preparation method thereof. Background technique [0002] Natural rubber (NR) is a natural polymer compound with cis-1,4-polyisoprene as the main component, and 91% to 94% of its components are rubber hydrocarbons (cis-1,4-polyisoprene Diene), and the rest are non-rubber substances such as protein, fatty acid, ash, sugar, etc. Natural rubber is the most widely used general-purpose rubber. At present, in order to further improve the performance of rubber and reduce the cost of rubber industry, it is usually necessary to fill other materials into the rubber compound. [1] , such as carbon black, white carbon black, etc. In recent years, research on the application of inorganic substances such as clay, calcium carbonate, talcum powder, and montmorillonite to rubber has gradually increased. However, with the increasing shortage of energy s...

Claims

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Application Information

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IPC IPC(8): C08H7/00C08L7/00C08L23/22C08L11/00C08L97/00C08K13/02C08K3/04C08K3/06C08K3/22C08K5/09C08K5/47
CPCC08H6/00C08L7/00C08L23/22C08L11/00C08L2205/05C08K2003/2296C08L97/005C08K13/02C08K3/04C08K3/06C08K3/22C08K5/09C08K5/47Y02T10/86C08K5/01C08K5/36C08K3/36C08H8/00
Inventor 朱晨杰徐新建应汉杰李明庄伟欧阳平凯沈涛单军强
Owner NANJING UNIV OF TECH
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