Method for preparing normal temp solidified high stvength glass fire reinforced plastics

A technology of curing at room temperature and glass fiber reinforced plastics, which is applied in the field of preparation of organic materials, which can solve the problems of acrolein being highly toxic, reducing the performance of products, and turning black of products, and achieves the effects of good flame retardancy, easy operation, and high mechanical strength

Inactive Publication Date: 2004-03-24
SHANDONG ANALYSIS & TEST CENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it still needs to add methyl donors such as furfural and acrolein to the phenolic resin to accelerate curing and reduce viscosity. Such donors have peculiar smell, are volatile and toxic, such as conaldehyde, which has peculiar smell and makes the product black after curing. Aldehydes are highly toxic
Moreover, the initial product of resorcinol and formaldehyde used as a curing agent still contains a large amount of water, which will also leave pinholes in the cured product, reducing the performance of the product

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Preparation of modified curing agent: take 550 grams of resorcinol (95%), add in a reaction tank with stirring and a thermometer, add 700 grams of acetyl chloride while stirring, react completely, remove gas under reduced pressure, add oxalic acid 15 grams, continue to stir until the reaction is complete and set aside.

[0021] Preparation of phenolic resin: Weigh 470 grams of phenol, add it to a reaction tank with stirring and a thermometer, stir and raise the temperature to above 90°C, add 5 grams of zinc acetate and water, stir and gradually add 300 grams of paraformaldehyde, keep warm and react until Viscosity up to 200-800MPa·S, vacuum dehydration to obtain light yellow resin.

Embodiment 2

[0023] Preparation of phenolic resin: Weigh 500 grams of phenol, add it to a reaction vessel with a stirrer and a thermometer, stir and heat up to 90°C, add 5 grams of sodium hydroxide, stir and add 900 grams of 37% formaldehyde solution, and reflux for 5 hours Finally, remove the water in a vacuum, and add acid to adjust the pH value to neutral.

[0024] Preparation of modified curing agent: Weigh 560 grams of resorcinol (95%), put it into a reaction tank with stirring and a thermometer, add 900 grams of acetic anhydride while stirring, raise the temperature to 90 ° C, react for 1 hour and cool it for later use .

Embodiment 3

[0026] For the preparation of phenolic resin FRP products, the phenolic resin and the modified curing agent are mixed in a ratio of 1:5, and then the phenolic resin FRP products with a thickness of 2mm are prepared by hand brushing glass cloth, and cured at room temperature for 0.5-48 hours.

[0027] 1. In the preparation method of normal temperature curing high-strength FRP of the present invention, use the phenolic resin and curing agent prepared in Example 1, and use the 0.14mm plain glass cloth produced by Shanghai Yaohua Alkali-Free Fiber Co., Ltd., and the consumption is 49%.

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Abstract

The present invention provides a preparation method of normal temp. solidified high-strengthu glass fibre reinforced plastics, including preparation of phenolic resin, preparation of modification solidifying agent and preparation of modified phenolic resin glass fibre reinforced plastics. It is characterized by that the phenolic resin and modification solidifying agent are mixed under the action of catalyst, and solidified at normal temp., then can be used for making various phenolic resin glass fibre reinforced plastics products.

Description

1. Technical field [0001] The invention relates to a method for preparing organic materials, in particular to a method for preparing high-strength phenolic glass reinforced plastics solidified at room temperature. 2. Technical background [0002] Glass fiber, carbon fiber, nylon fiber and other fibers are impregnated and bonded with resin, and can be made into various fiber-reinforced composite materials or equipment. Because this composite material has good mechanical properties, it is widely used in construction, transportation, aviation, Electrical, mining, chemical equipment, military and other fields, among which the composite material made of fiber is also known as glass fiber reinforced plastic. The resins usually used to bond impregnated fibers include epoxy, polyester, phenolic, PVC, etc. Among them, phenolic resin and epoxy resin are widely used as thermosetting resins, especially phenolic resin with its good heat resistance and good Flame retardancy is also favor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G8/10
Inventor 刘继广
Owner SHANDONG ANALYSIS & TEST CENT
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