Prepreg rapidly cured at room temperature and preparation method

A rapid curing, prepreg technology, applied in the field of composite materials, can solve the problems of energy consumption and equipment investment, and achieve the effect of reducing energy consumption and equipment cost

Inactive Publication Date: 2019-10-18
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem of high energy consumption and large investment in equipment caused by the high temperature molding of existing prepregs, the present invention provides a prepreg that is rapidly cured at room temperature; Preparation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The preparation operation steps of the prepreg for rapid curing at room temperature are as follows:

[0038] (1) Preparation of resin composition

[0039] In parts by weight, 52 g bisphenol A epoxy acrylate, 20 g phosphoric acid modified epoxy acrylate, 0.3 g 2,4,6-trimethylbenzoyl-diphenylphosphine oxide, 0.3 g 2 , 4,6-Trimethylbenzoyl-ethoxy-phenylphosphine oxide, 0.5 g tert-butyl peroxybenzoate, 5 g lauryl acrylate, 5 g trimethylolpropane triacrylate and 5 g Aluminum hydroxide was added into the mixing kettle and mixed in the dark at room temperature, wherein the stirring speed was 300 rpm, the mixing time was 0.5 h, and vacuum defoaming was carried out for 0.5 h to prepare a uniform liquid resin composition.

[0040] Pour the above resin composition into a mold, and at room temperature, an ultraviolet surface light source (UV-LED light source, main wavelength 365nm, radiation energy 68 mW / cm 2 ) was irradiated for 10 seconds, and the product was completely cured f...

Embodiment 2

[0045] The preparation operation steps of the prepreg for rapid curing at room temperature are as follows:

[0046] (1) Preparation of resin composition

[0047] In parts by weight, 25 g fatty acid modified epoxy acrylate, 50 g novolac epoxy acrylate, 0.5 g 2,4-diethylthioxanthone, 0.5 g [2-methyl 1-(4- Methylmercaptophenyl)-2-morpholine-1-propanone], 0.3 g 2-ethylanthraquinone, 1 g azobisisobutyronitrile, 1 g tert-amyl peroxy-2-ethylhexanoate, 5 g Add 1,6-hexanediol diacrylate, 20 g of ethoxylated trimethylolpropane triacrylate, and 5 g of silicon dioxide into a mixing kettle and mix in the dark at room temperature. The stirring speed is 400 rpm, and the mixing time is for 1 h, and vacuum defoaming for 1 h to prepare a uniform liquid resin composition. The measured glass transition temperature of the resin composition was 163°C.

[0048] (2) Preparation of prepreg

[0049] Put 40 g of the resin composition into the resin tank, and use a film coating machine to coat a film...

Embodiment 3

[0052] The preparation operation steps of the prepreg for rapid curing at room temperature are as follows:

[0053] (1) Preparation of resin composition

[0054] In parts by weight, 30 g polyester acrylate, 30 g polyurethane acrylate, 0.25 g benzophenone, 0.25 g 4,4-bis(dimethylamino) benzophenone, 0.3 g dicumyl peroxide , 0.2 g of dibenzoyl peroxide, 10 g of hydroxyethyl methacrylate, 5 g of ethylene glycol diacrylate, and 2 g of silicon dioxide were added to the mixing kettle and mixed in the dark at room temperature. The mixing time is 300 rpm, the mixing time is 1.5 h, and vacuum defoaming is performed for 1.5 h to obtain a uniform liquid resin composition. The measured glass transition temperature of the resin composition was 157°C.

[0055] (2) Preparation of prepreg

[0056] Add 55 g of the resin composition to the resin tank, and use a film coater to coat a film on the release paper at room temperature to prepare an impregnated film; then take 45 g of ultra-high mol...

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Abstract

The invention relates to a prepreg rapidly cured at room temperature. The prepreg comprises a resin composition and a fiber-reinforced fabric, wherein the resin composition is prepared through uniformly mixing the following raw materials at room temperature in a shaded manner: resin, a photoinitiator, a thermal initiator, a reactive diluent and additives, and is viscous liquid; a flaky prepreg isprepared through dipping the fiber-reinforced fabric with the resin composition and sticking a black barrier film on the fiber-reinforced fabric; and when a composite product is prepared through subjecting the prepreg to tailoring, sticking and curing, the curing process conditions are as follows: the time of irradiation by an ultraviolet light source at room temperature is 10 to 30 seconds, and the time of curing placement is 0.1 to 5 minutes. According to the prepreg, room-temperature rapid curing can be carried out by using autologous reaction heat by only irradiation under the ultravioletlight source without supplying energy to a reaction system, heating and adding of other chemicals are not required during molding, a postcuring procedure is also not required, and thus, the aim of room-temperature rapid curing is achieved.

Description

technical field [0001] The invention belongs to the field of composite materials, and in particular relates to a prepreg capable of rapid curing at room temperature. Background technique [0002] Fiber prepreg is to dip-coat the resin system onto continuous fiber or fiber fabric, form a dry or slightly viscous semi-finished product through a certain process, and then use it to form composite products. Prepregs can be stored for future use, and are important intermediate materials for the manufacture of continuous fiber reinforced composite products. At present, the hot-melt prepreg process has become the development direction of the current prepreg due to its advantages of accurate resin content control, fast production speed, environmental protection, and no environmental pollution. [0003] Thermosetting resin prepregs are divided into medium temperature prepregs cured at about 120 °C and high temperature prepregs cured at 177 °C or higher according to the curing temperat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L63/10C08L67/06C08L75/14C08L23/06C08L77/10C08K7/14C08K7/06C08J5/24
CPCC08J5/24C08J2363/10C08J2367/06C08J2375/14C08J2423/06C08J2463/10C08J2477/10C08K7/06C08K7/14
Inventor 汪瑾陈虎成肖亚辉吴晶晶
Owner HEFEI UNIV OF TECH
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