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A kind of cardanol modified phenolic resin used as adhesive for rubber and its products

A technology of phenolic resin and cardanol, used in transportation and packaging, special tires, tire parts, etc., can solve the problems of complex process, consumption of phenol reactive points, smoke and other problems

Active Publication Date: 2019-08-23
SINO LEGEND CHINA CHEM +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Patent EP082791B1 discloses that the resin prepared by phenol, alkyl carbamate and formaldehyde does not contain resorcinol, but the residual urethane group remains in the resin and is partially released, causing smoke, and the alkyl alkyl formic acid Esters also consume reactive sites for phenol
Patent CN102459379 discloses the preparation of a mixture of phenol-formaldehyde resin and urethane-aldehyde resin as an adhesion promoter. Components have very low reactivity with methylene donors

Method used

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  • A kind of cardanol modified phenolic resin used as adhesive for rubber and its products
  • A kind of cardanol modified phenolic resin used as adhesive for rubber and its products
  • A kind of cardanol modified phenolic resin used as adhesive for rubber and its products

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0095] In a 5L four-necked round-bottomed reaction flask equipped with a stirrer, thermometer, reflux condenser and dropping funnel, add 1880g phenol, 235g cardanol, 25g oxalic acid, heat to 95-100°C, then drop in 90 minutes Add 1260g of 37% formaldehyde solution, and continue to reflux for 30 minutes after the dropwise addition. At this time, change the reflux device to a distillation device, heat up and steam the water and part of unreacted phenol generated by the reaction. When the temperature reaches 114-115 ° C, no longer If there is water to evaporate, continue to heat up to 195-200°C, then add steam to distill for 60 minutes, then continue vacuum distillation at 195-200°C for 60 minutes (vacuum degree -95KPa), and obtain cardanol modified phenolic resin after breaking the vacuum 2250 grams. The softening point of the resin is 95°C, and the free phenol is 0.32%.

Embodiment 2

[0097] In a 5L four-necked round-bottomed reaction flask equipped with a stirrer, a thermometer, a reflux condenser and a dropping funnel, add 1880g of phenol and 10g of p-toluenesulfonic acid monohydrate, heat to 95-100°C, and then Add 1170g of 37% formaldehyde aqueous solution dropwise, and continue to reflux for 30 minutes after the addition is completed. At this time, the reflux device is changed to a distillation device, and then the temperature is raised and the water generated by the reaction and part of the unreacted phenol are evaporated, and the temperature reaches 114-115°C When no more water is distilled out, add 235 grams of cardanol, change the distillation device to a reflux device, continue to heat up to 180-185 ° C and react for 60 minutes, then add 8 grams of triethanolamine and continue to stir for 5-10 minutes. Change the reflux device to a distillation device, continue to heat up to 195-200°C, and then pass in steam for distillation for 60 minutes, then con...

Embodiment 3

[0099] The cardanol-modified phenolic resin prepared by embodiment 1, embodiment 2 is tested and verified in the rubber formula, and with resorcinol, commercially available SL-3022 resin (resorcinol formaldehyde resin) and PN760 resin ( Butyl carbamate modified phenol formaldehyde resin) for comparison. Wherein the formula of rubber is refined according to the formula shown in Table 1, wherein the blending amount of each component is based on the rubber per 100 parts by weight (phr).

[0100] The formula of table 1 rubber composition

[0101] Compounding amount / phr Natural Rubber (NR) 100.00 Carbon black (N236) 60.00 Zinc oxide 7.00 stearic acid 0.50 Cobalt salt (CN20.5%, Shepherd company product) 0.75 Sulfur (80%, OT20) 5.00 N, N-dicyclohexyl-2-benzothiazole sulfenamide (DZ) 1.20 N-(1,3-Dimethylbutyl)-N’-phenyl-p-phenylenediamine (4020) 1.00 HMMM (65% pure, supported on silica) 3.50 The resin of embodiment ...

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Abstract

The invention provides cardanol modified phenol formaldehyde resin and application thereof as a binding accelerator for rubber and a rubber product. When the cardanol modified phenol formaldehyde resin is used as the binding accelerator, the prepared rubber and the rubber product have the characteristics of being free of smoke formation, high in modulus, high in hardness and good in all-steel cord withdrawability in the mixing process. In addition, the invention further provides a tire belt layer prepared from a rubber composition containing the cardanol modified phenol formaldehyde resin and a pneumatic tire prepared from the tire belt layer.

Description

technical field [0001] The invention belongs to the field of rubber and products thereof, in particular to a cardanol-modified phenolic resin, an adhesive used as rubber and its products, and a tire belt prepared from the rubber composition using the adhesive A pneumatic tire was prepared from the tire belt. Background technique [0002] Rubber products such as tires, belts and hoses generally require reinforcing materials such as steel wires and fibers as skeleton materials. The belt layer of radial tires often uses steel wires, which requires good adhesion between the vulcanized rubber and the steel wires, and an adhesion promotion system is usually added to maintain the adhesion between the rubber and the steel wires. Existing adhesion promotion systems generally include resorcinol or resorcinol resin as the methylene acceptor and hexamethylenetetramine (HMT) or hexamethoxymethylmelamine (HMMM) as the methylene donor . During the vulcanization process, the methylene ac...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L61/14C08G8/30C08L7/00C08K3/04B60C1/00
Inventor 鲁代仁赵燕超陈新
Owner SINO LEGEND CHINA CHEM
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