Check patentability & draft patents in minutes with Patsnap Eureka AI!

Prepreg manufacturing method and prepreg

A prepreg, wetting technology, used in thin material processing, coating, electrical components, etc., can solve the problems of short dipping time, insufficient dipping effect, air trapped in the substrate, etc.

Inactive Publication Date: 2009-09-30
SUMITOMO BAKELITE CO LTD
View PDF1 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among the methods of impregnating the base material with liquid resin, the dipping method in which the base material is immersed in the liquid resin is relatively common, but the problem of this dipping method is that air may be trapped inside the base material, thereby leaving many untreated parts. impregnated part (void)
However, with this dampening roll method, since the contact length between the base material and the dampening roll is short (only about 100 mm), the time for the base material to be impregnated with the liquid resin is short and the impregnation effect is insufficient

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Prepreg manufacturing method and prepreg
  • Prepreg manufacturing method and prepreg
  • Prepreg manufacturing method and prepreg

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0053] 1. Preparation of liquid resin composition

[0054] With 85 parts by weight of tetrabromobisphenol A type epoxy resin (EPICOAT 5047 of Japan Epoxy Resins (JapanEpoxy Resins), epoxy equivalent 550), 15 parts by weight of cresol novolac type epoxy resin (cresol novolak type epoxy resin) (EPICLON 690 of Dainippon Ink and Chemicals (Dainippon Ink and Chemicals), epoxy equivalent 210), 2.3 parts by weight of dicyandiamide (dicyandiamide), and 0.1 parts by weight of 2-ethyl-4-methyl Imidazole was dissolved in N,N-dimethylformamide to prepare a liquid resin composition having a non-volatile fraction concentration (by weight) of 55%.

[0055] 2. Fiber substrate

[0056] Long glass fibers (Nitto Boseki, WEA-7628) having a thickness of 0.18 mm and a width of 1000 mm were used.

[0057] 3. Manufacture of prepreg

example 1

[0059] figure 1 The shown apparatus is used to impregnate a fibrous substrate with a liquid resin composition. The following are the specifications and operating conditions of the device:

[0060] (1) Substrate conveying speed: 5m / min.

[0061] (2) Diameter of wetting rollers 11, 12, 13: 300mm.

[0062] (3) The contact length between the dampening rollers 11, 12, 13 and the substrate: 150 mm, respectively.

[0063] (4) Contact time between the dampening rollers 11, 12, 13 and the substrate: 5.4 seconds in total.

[0064] After impregnation, the substrate was thermally dried at 180° C. for 2 minutes in a thermal drying device so that the resin composition content (by weight) in the prepreg was 51%.

example 2

[0066] A prepreg was manufactured using the same method as in Example 1, except that the substrate transport speed was set to 9 m / min, and the total contact time between the dampening rolls 11, 12, 13 and the substrate was 3.0 seconds.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
Thicknessaaaaaaaaaa
Widthaaaaaaaaaa
Login to View More

Abstract

The invention offers a method of manufacturing a prepreg capable of impregnating a fiber substrate with a liquid resin with a high degree of impregnation, and a prepreg obtained by this method. The invention is a method of manufacturing a prepreg by impregnating a long fiber substrate with a liquid resin using a kiss roller whose bottom portion is immersed in a liquid resin, including a step of impregnating the fiber substrate with a liquid resin from one surface thereof, by conveying the fiber substrate while maintaining contact with a circumferential surface of the kiss roller which is not immersed in resin, and performing this step at least twice in succession, and a prepreg obtained by this manufacturing method.

Description

technical field [0001] Embodiments of the present invention relate to a method of manufacturing a prepreg and a prepreg produced by the method. Background technique [0002] Generally, prepregs used to manufacture laminates (laminates) used in products such as printed circuit boards are obtained by impregnating a long-fiber substrate (hereinafter sometimes simply referred to as "substrate") with a liquid resin, followed by drying or semi-preg. obtained by solidification. The substrate may be in the form of cloth, and its material may be glass fiber, polyester fiber, aramid fiber, or the like. Examples of liquid resins include resin varnishes containing resins such as epoxy resins or polyindene resins, which are mixed with a curing agent as necessary and dissolved in an organic solvent. Prepregs can be manufactured continuously by impregnating such a fibrous substrate with a liquid resin while continuously advancing the substrate. Among the methods of impregnating the base...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): B29B15/12B29K309/08
CPCH05K1/0366B29B15/122B29B15/125Y10T428/2938B29B15/12B29K2309/08
Inventor 飞泽晃彦小俣浩浦田佳辉
Owner SUMITOMO BAKELITE CO LTD
Features
  • R&D
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com