Cashew shell modified alkyd resin and preparation method thereof

A technology of cashew nut shell oil and a manufacturing method, which is applied in the field of manufacturing and application of modified phenolic resin, can solve problems such as complex production process, increased cost, and difficulty in quality consistency, and achieve simple manufacturing process, reduced usage, and free phenol low effect

Inactive Publication Date: 2008-03-19
浙江南方塑胶制造有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With the global energy shortage and the emphasis on environmental protection, it is difficult for ordinary phenolic resins to meet the needs of the market. In addition, it is difficult to control the consistency of quality in the production of traditiona

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0011] Example 1. Take 400 g of phenol and add 100 g of cashew nut shell oil. Heat to 80°C under full stirring, use hydrochloric acid to adjust the acidity pH to 3-4, and cool down after two hours of reaction. When the temperature is about 60°C, add 350g (37%) formaldehyde solution, continue to adjust the pH value to be about 2, in a reactor with a reflux device, heat up to 97°C for reaction, keep warm for 50 minutes, and then dehydrate at normal pressure After 40 minutes, decompression and dehydration are carried out. After sampling and analysis, when the dropping point is about 100 ℃, the negative pressure discharge is released. The main indicators of the obtained products are as follows:

Viscosity: 40S (4# coating cup)

Dropping point: 102℃

Gel time: 50S (150℃)

free phenol 5

Yield 112%

example 2

[0012] Example 2: Other conditions were the same as Example 1, 350 g of phenol, 150 g of cashew nut shell oil, 340 g of formaldehyde, and the catalyst was sulfuric acid. During the reaction, dehydration at normal pressure is no longer carried out. After the heat preservation reaction, dehydration under reduced pressure is carried out directly. Due to the large foaming in the later stage, a defoaming agent is required. And add a certain mass of barium hydroxide to neutralize the sulfuric acid to make the resin neutral. The main indicators of the obtained products are as follows:

Viscosity: 48S (4# coating cup)

Dropping point: 105℃

Gel time: 45S

Free phenol: ≤5

Yield 118%

example 3

[0013] Example 3: 400 g of phenol and 100 g of cashew nut shell oil were reacted under acidic catalyst conditions for two hours, washed with water, then added with 450 g (37%) of formaldehyde, the catalyst was ammonia water, and the pH value was adjusted to 11-12. When the cloud point of the reaction occurs, the reaction is continued for 30 minutes, heated, dehydrated under reduced pressure, and the temperature is kept below 100 °C.

Index: viscosity 42S (4# coating cup)

Dropping point: 101℃

Gel time: 42S (180℃) (without adding curing agent)

Yield 122%

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Abstract

The invention relates to a production method of cashew nut oil modified phenolic resin. Phenol and cashew nut oil are sufficiently mixed under the acidic or alkaline environment, wherein, the main ingredient of the cashew nut oil is the polyhydric phenol of C8-C27, the weight of the cashew nut oil accounts for twenty to thirty percent (weight percentage) of the total weight of the cashew nut oil and the phenol, and the acidic environment is obtained by using catalyst, the addition amount of which is one to three percent (one to two percent for the alkaline environment); the mixture is mixed with formaldehyde, temperature is raised, reaction lasts until the synthesis of the phenolic resin is finished, and wherein, the molar ratio of the formaldehyde is 1:0.72 to 0.78 (1:1.2 to 1.4 for the alkaline environment. the catalyst must be ammonia). The thermoplastic phenolic resin prepared by the invention is characterized in low free phenol and high molecular weight and can be applied to not only molding materials but also friction materials; meanwhile, the production process of the modified phenolic moulding materials is simple, the use amount of phenol and formaldehyde is reduced, the concentration of wastewater is lowered, and therefore environment is protected; moreover, the plant oil applied by the preparation method of the invention is a regenerative resource.

Description

technical field [0001] The invention relates to the field of manufacture and application of modified phenolic resin, in particular to a phenolic resin modified by cashew nut shell oil and a manufacturing method. Background technique [0002] Phenolic resin is one of the earliest used resins, and there are many kinds of modifications. It is widely used and has irreplaceable functions in coatings, friction materials, and plastics. With the global energy shortage and the emphasis on environmental protection, it is difficult for ordinary phenolic resins to meet the needs of the market. In addition, in the production of traditional production methods, it is difficult to control the consistency of quality, especially in the modification reaction, not only need Special catalysts also require special raw materials, and the production process has become complicated. Therefore, although the quality has been greatly improved, the cost has also increased a lot. SUMMARY OF THE INVENTIO...

Claims

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Application Information

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IPC IPC(8): C08G8/32C08L61/06C08J5/14
Inventor 陈永水陈永生牟晓伟林进淼
Owner 浙江南方塑胶制造有限公司
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