JPS6096614A - Reaction of phenol with tung oil - Google Patents

Abstract

PURPOSE:To improve the electrical properties of a paper-phenol laminated sheet and decrease the amount of triethylamine used in the synthesis of the resin, by reacting a phenol with tung oil in the presence of p-toluenesulfonic acid and water used in a specified ratio. CONSTITUTION:0.1-0.5wt% p-toluenesulfonic acid and 0.7-4wt% water are added to a phenol and tung oil in such amounts that the weight ratio of the water to the p-toluenesulfonic acid is 1:5-20, and the resulting mixture is subjected to the primary reaction. The product of this primary reaction is made slightly alkaline by the addition of triethylamine. After adding formaldehyde, the resulting mixture is subjected to the secondary reaction in the presence of triethylamine as a catalyst.

Description

[Detailed description of the invention] 〔Technical field〕 It belongs to the field of manufacturing technology for resin for laminates.

[Background technology]

Conventionally, laminates made of paper and phenol using resin modified with tung oil sometimes did not meet the requirements in terms of electrical performance.

Furthermore, the secondary reaction of C with formaldehyde, which is carried out after the reaction of phenol and tung oil, requires a large amount of catalyst, which poses a cost problem.

[Purpose of the invention]

The present invention aims to improve the electrical performance of paper phenol laminates and to eliminate the use of triethylamine as a catalyst in the process of synthesizing the resin used in the laminates.

[Imposition of invention]

The laminate is required to have good aeration properties, and we have discovered that to achieve this, it is necessary to reduce the amount of carboxylic acid in the resin.

In order to reduce the amount of carboxylic acid, it is necessary to suppress the production of hydrolysates produced during the reaction between phenol and tung oil. Therefore, it has been found that in order to suppress the hydrolyzate lit, it is necessary to appropriately determine the amounts of the catalyst p-toluenesulfonic acid and water added in the reaction between phenol and tung oil (first reaction). The catalyst para-toluenesulfonic acid is used in a weight ratio of 0.1% to 0.5% based on the total formulation. If the amount is less than this range, addition of phenol to tung oil, which is the purpose of the reaction, will occur. Moreover, if the amount exceeds this range, the amount of hydrolyzate increases too much, which deteriorates the performance. If the amount of water is too small, gelation will occur,
If it is too large, the amount of hydrolyzate increases.

In order for the reaction to proceed and to bring about an improvement in electrical performance, the weight ratio of water and para-toluenesulfonic acid should be 5 to 30.
and the blending ratio of water and paratoluenesulfonic acid to the total blend is rLo, 5 to 4, and 0.1, respectively.
It has been found that it is necessary to set the value to 0.5 cm.

After the primary reaction is completed, the primary product is reacted with formaldehyde (secondary reaction), and toluethylamine is used as a catalyst to be added at this time. Furthermore, in order to promote the reaction, V must be slightly alkaline, so if there is a large amount of hydrolyzate, a large amount of triethylamine is required due to the influence of the carboxylic acid contained therein. 7JD water decomposition product amount'trg
By reducing the amount of triethylamine, the total amount of triethylamine can be reduced, which is effective in reducing costs.

All examples of this reaction are shown below.

This reaction involves 60 ii parts of phenol and 4 parts of tung oil as a primary reaction.
To 0 parts by weight, water and para-toluenesulfonic acid as shown in the following table were added and reacted at 80°C for 180 minutes. After the reaction is completed, the reactant is neutralized with triethanolamine. After that 2
For the next reaction, 68 parts by weight of the primary reactant and 37 parts of formalin
2 parts by weight [1.5 parts of 25% T7 monia water] and the following amounts of triethylamino were added and reacted at 330°C for 180 minutes.

After dehydration, diluted with methanol to obtain tl, varnished gold paper (
(The insulation resistance was measured after 2 hours of boiling according to JISK-6911.)

The residual double bond was determined from the absorption peak at 990 cm in the infrared absorption spectrum. The amount of hydrolyzate was calculated by GPC, and the phenol reaction rate was calculated by gas chromatography.

〔Effect of the invention〕

This invention provides that the weight ratio of water and para-toluene sulfonic acid added is 5 or more and 20 or less, and the weight ratio of water and para-toluene sulfonic acid in the total formulation is 0.7, respectively.
% or more and 4% or less, and 0.1% or more and 0.5% or less, so the reaction between phenols and tung oil can proceed in a favorable manner, and therefore the product used
・The electrical performance of the 5 plates has been improved, and the amount of triethylamine used in the resin synthesis process has been reduced.

patent applicant Matsu')'Denkou Co., Ltd. Representative Patent Attorney Toshimaru Takemoto (2 others)

Claims (1)

[Claims] (1) When reacting phenols with tung oil, para-toluenesulfonic acid and water are added and reacted, and the weight ratio of water to the amount of para-toluenesulfonic acid added is 5. The weight ratio of water and para-toluenesulfonic acid in the total formulation should be 0.7% or more and 4% or less, and 0.1% or more and 0.1% or more and 0.1% or more and 0.1% or more and 0.7% or more and 4% or less, respectively.
．． A method for reacting phenol and tung oil, characterized in that the amount is 5% or less.