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Preparation method of phenolic resin used for hand lay-up fiberglass-reinforced plastic

A technology of phenolic resin and glass fiber reinforced plastic, applied in the field of glass fiber reinforced plastic, can solve the problems of slow curing speed of phenolic resin and prolong the production cycle of phenolic glass fiber reinforced plastic products, so as to achieve the effect of increasing curing speed, shortening curing time and improving efficiency.

Active Publication Date: 2012-10-17
SHANDONG SHENGQUAN NEW MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with the traditional unsaturated polyester resin FRP, the FRP with phenolic resin as the base material in the synthetic resin has better fire and flame retardant properties, but the curing speed of the phenolic resin is much slower than that of the unsaturated resin. , and need to be heated to cure, which relatively prolongs the production cycle of phenolic FRP products

Method used

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  • Preparation method of phenolic resin used for hand lay-up fiberglass-reinforced plastic

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Add phenol, catechol, formaldehyde and sodium hydroxide into the reactor at a molar ratio of 1.0:0.5:2.0:0.03, raise the temperature to 40°C, react at constant temperature for 5 hours, raise the temperature to 85°C and continue the reaction for 2 hours; The obtained mixture was distilled under reduced pressure to remove part of the water: the distillation temperature was 40°C, the pressure was 0.5MPa, and the viscosity of the liquid was adjusted to 8000MPa·s / 25°C.

[0019] The phenolic resin produced in this embodiment has a solid content of 65-70%, a water content of 10-15%, and a free phenol content of 3-6%.

Embodiment 2

[0021] Add phenol, hydroquinone, formaldehyde and potassium hydroxide into the reactor at a molar ratio of 1.0:0.3:2.0:0.05, raise the temperature to 50°C, react at constant temperature for 6 hours, raise the temperature to 90°C and continue the reaction for 2 hours; The resulting mixture was distilled under reduced pressure to remove part of the water. The distillation temperature is 50°C, the pressure is 0.6MPa, and the viscosity of the liquid is adjusted to 9000MPa·s / 25°C.

[0022] The phenolic resin produced in this embodiment has a solid content of 67-72%, a moisture content of 5-13%, and a free phenol content of 7-10%.

Embodiment 3

[0024] Add phenol, resorcinol, formaldehyde and sodium bicarbonate in a molar ratio of 1.0:0.8:1.5:0.06 to the reactor, raise the temperature to 55°C, react at constant temperature for 4 hours, raise the temperature to 95°C and continue the reaction for 3 hours; The resulting mixture was distilled under reduced pressure to remove part of the water. The distillation temperature is 50°C, the pressure is 0.8MPa, and the viscosity of the liquid is adjusted to 10000MPa·s / 25°C.

[0025] The phenolic resin produced in this embodiment has a solid content of 70-75%, a water content of 4-10%, and a free phenol content of 5-8%.

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Abstract

The invention discloses a preparation method of phenolic resin used for hand lay-up fiberglass-reinforced plastic. The method comprises the following steps of: (1) adding phenol, polyhydroxy phenol, formaldehyde and a basic catalyst to a reaction kettle at a mol ratio of 1.0:(0.1-1.5):(0.8-2.0):(0.02-1.0), heating to 40-75 DEG C, carrying out reaction at a constant temperature for 2-10 hours, heating to 85-95 DEG C and continuing reacting for 1-5 hours to obtain a mixture; and (2) vacuum-distilling the mixture obtained in step (1) for dewatering to liquid viscosity 5000-10000 MPa.s / 25 DEG C. According to the invention, polyhydroxy phenol with more active hydroxyl groups compared with that of phenol is added during the synthesis process of phenolic resin, thus improving the solidifying speed of phenolic resin, shortening the solidifying time and improving production efficiency under the condition of identical solidifying agent addition amount; and high hydroxyl group content increases crosslinking points and improves mechanical properties of phenolic resin.

Description

technical field [0001] The invention relates to the technical field of glass fiber reinforced plastics, in particular to the technical field of synthetic resin for hand lay-up glass fiber reinforced plastics, in particular to a preparation method of the phenolic resin for glass fiber reinforced plastics. Background technique [0002] Fiber Reinforced Plastics (Fiber Reinforced Plastics) referred to as FRP, the scientific name of glass fiber reinforced plastics, it is a composite reinforced with glass fiber and its products, such as glass cloth, tape, felt, yarn, etc. plastic material. The relative density of FRP is between 1.5 and 2.0, which is only 1 / 4 to 1 / 5 of that of carbon steel, but its tensile strength is close to or even exceeds that of carbon steel, and its specific strength can be compared with that of advanced alloy steel. Therefore, it has excellent results in aviation, rockets, spacecraft, high-pressure vessels and other products that need to reduce their own w...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G8/24C08L61/06C08K5/092C08K7/14
Inventor 唐一林邓刚张吉瑞乔洪伟徐小韦
Owner SHANDONG SHENGQUAN NEW MATERIALS CO LTD
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