Method of preparing modified benzoxazine glass cloth veneer sheet

A benzoxazine and a manufacturing method technology are applied in the manufacturing field of modified benzoxazine glass cloth laminates, and can solve the problem of unbalanced performance, poor electrical performance and high dielectric constant of the benzoxazine glass cloth laminates problems, to achieve the effect of high wet resistance retention, excellent dielectric strength, and low hygroscopicity

Inactive Publication Date: 2008-05-14
CHINESE ELECTRICAL EQUIP GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention can solve the technical problem of unbalanced performance of ordinary benzoxazine glass cloth laminates, and overcome the shortcomings of poor toughness, high dielectric constant and poor electrical performance compared with epoxy resin systems

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Example 1 A benzoxazine glass cloth laminate was prepared according to the method of the present invention.

[0022] 1. Preparation of modified benzoxazine resin:

[0023] The reaction material formula is as follows

[0024] Phenol: 1000 parts

[0025] Cardanol: 150 servings

[0026] Formaldehyde aqueous solution (37%): 1850 parts

[0027] MDA: 1100 parts

[0028] Toluene: 1900 parts

[0029] Ethanol: 900 parts

[0030] The synthesis reaction process is consistent with the common MDA-type benzoxazine synthesis process, that is, phenol, cardanol, formaldehyde solution (37%), ethanol, and toluene are added to the reaction bottle in turn, and the stirring is started, and the pH value is adjusted to about 7 with NaOH, and then Gradually add MDA to raise the temperature to reflux temperature of 80-85°C, stir and react for 5 hours, and obtain a yellow transparent benzoxazine (BOZ) resin glue solution through layered dehydration.

[0031] 2. Glue preparation

[0032] P...

Embodiment 2

[0040] With embodiment 1, difference is that the preparation of step 1 modified benzoxazine resin is carried out according to the following reaction material formula:

[0041] Phenol: 1000 parts

[0042] Cardanol: 250 servings

[0043] Formaldehyde aqueous solution (37%): 1948 parts

[0044] MDA: 1133 copies

[0045] Toluene: 1950 parts

[0046]Ethanol: 920 parts

Embodiment 3

[0048] With embodiment 1, difference is that the preparation of step 1 modified benzoxazine resin is carried out according to the following reaction material formula:

[0049] Phenol: 1000 parts

[0050] Cardanol: 110 parts

[0051] Aqueous formaldehyde solution (37%): 1835 parts

[0052] MDA: 1088 parts

[0053] Toluene: 1880 parts

[0054] Ethanol: 890 parts

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Abstract

The invention discloses a manufacturing method for a new modified benzoxazine glass cloth laminated board, which comprises the steps of modified benzoxazine resin preparation, glue solution preparation and dipping, baking and suppression; wherein, cardanolis is introduced to replace part of phenol in the process of benzoxazine resin synthesis; simultaneously, a dual crossing and curing combination system is adopted, namely a combination of an organic metal complex catalyze solidifying system and a thermal polymerization cross-linking system initiated by peroxide free radical. The invention has the advantages that the benzoxazine glass cloth laminated board has balanced performance; the toughness of benzoxazine is enhanced; simultaneously, the enhanced performance is the material electrical property of the reduced water absorbent of material, the increased resistivity and dielectric intensity strength, mediator loss and dielectric constant, the mechanical strength and heat-resistance are slightly declined, and the invention is applicable to the H class insulation material.

Description

technical field [0001] The invention relates to a manufacturing method of a novel heat-resistant laminated insulating material, in particular to a manufacturing method of a modified benzoxazine glass cloth laminated board. Background technique [0002] The benzoxazine glass cloth laminate has excellent heat resistance, mechanical properties and electrical properties. Type benzoxazine and MDA type benzoxazine, the former belongs to F-class materials, and the latter belongs to H-class materials. Since some properties of benzoxazine materials are far excessive, while others are insufficient, such as high brittleness and high dielectric constant, etc., it is necessary to modify them in order to obtain a balance of properties and more ideal application effect. The main purpose of modification is to improve the toughness of benzoxazine materials and improve the electrical properties of materials. The improvement of electrical properties mainly includes the reduction of water abs...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B37/06B32B37/10B32B38/08B32B17/04C08G73/06C09J179/04
Inventor 朱祝文
Owner CHINESE ELECTRICAL EQUIP GRP CO LTD
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