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A kind of preparation method of toughened modified phenolic foam

A phenolic foam, toughening modification technology, used in the field of polymer thermal insulation materials, can solve the problems of high brittleness, low phenolic strength, easy powdering, etc., achieve high closed cell rate, meet performance requirements, mechanical properties and resistance. Heat-enhancing effect

Inactive Publication Date: 2016-01-27
SHANGHAI MARITIME UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] In order to overcome the deficiencies in the prior art above, the present invention has explored a new preparation method of toughened modified phenolic foam plastics through the improvement of composite toughening agent and curing agent and the research of phenolic composite and foaming technology. It solves the shortcomings of phenolic resin such as low strength, high brittleness, and easy pulverization, so that the mechanical properties and heat resistance of phenolic resin are effectively improved, so as to meet the performance requirements of ship technology for materials

Method used

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  • A kind of preparation method of toughened modified phenolic foam
  • A kind of preparation method of toughened modified phenolic foam
  • A kind of preparation method of toughened modified phenolic foam

Examples

Experimental program
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Effect test

Embodiment 1

[0045] Pour 30 grams of concentrated hydrochloric acid and 30 grams of acetic acid into the beaker in sequence, then weigh 30 grams of phosphorus pentoxide powder, add it to the beaker, and keep stirring, cool with ice-water bath, and use it as a curing agent for later use.

[0046] Take another small beaker, add 30 grams of isophthalic polyimide (PI) rinsed 2-3 times with n-pentane, and 21 grams of polyethylene glycol 1000 (PEG), stir well, as a compound additive The toughener is ready for use.

[0047] Inject 300 grams of A-stage phenolic resin with a molecular weight greater than 700, 30 grams of DC-193 (Dow Corning water-soluble silicone oil), the above composite toughening agent, and 60 grams of n-pentane into the mold in sequence, stir well, and then add the above multi-component mixed acid curing agent, After stirring for 1-10 minutes, put it in an oven at 60-80°C, pre-foam for 30 minutes, then raise the temperature to 90-100°C and mature for 1 hour, after cooling and d...

Embodiment 2

[0051] Pour 30 grams of concentrated hydrochloric acid and 30 grams of acetic acid into the beaker in sequence, then weigh 30 grams of phosphorus pentoxide powder, add it to the beaker, and keep stirring, cool with an ice-water bath, and use it as a curing agent for later use.

[0052] Take another small beaker, add 30 grams of isophthalic polyimide rinsed 2-3 times with n-pentane, and 9 grams of polyethylene glycol 1000, stir well, and use it as a composite toughening agent.

[0053] Inject 300 grams of A-stage phenolic resin with a molecular weight greater than 700, 30 grams of Tween 80, the above composite toughening agent, and 60 grams of n-pentane into the mold in sequence, stir well, then add the above multi-component mixed acid curing agent, and stir for 1-10 minutes , put it in an oven at 60-80°C, pre-foam for 30 minutes, then heat up to 90-100°C and mature for 1 hour, after cooling and demoulding, the modified phenolic foam plastic product B is finally obtained, and it...

Embodiment 3

[0057] Pour 30 grams of concentrated hydrochloric acid and 30 grams of acetic acid into the beaker in sequence, then weigh 30 grams of phosphorus pentoxide powder, add it to the beaker, and keep stirring, cool with an ice-water bath, and use it as a curing agent for later use.

[0058] Inject 300 grams of A-stage phenolic resin with a molecular weight greater than 700, 30 grams of isophthalic polyimide rinsed 2-3 times with n-pentane, 30 grams of DC-193, and 60 grams of n-pentane into the mold in sequence, and stir thoroughly , then add the above multi-component mixed acid curing agent, after stirring for 1-10 minutes, put it in an oven at 60-80°C, pre-foam for 30 minutes, then raise the temperature to 90-100°C and mature for 1 hour, after cooling and demoulding, finally get The performance test results of the modified phenolic foamed plastic product C are shown in Table 1.

[0059] The field emission transmission electron microscope (TEM) picture of the phenolic foam finished...

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Abstract

The invention discloses a preparation method of toughed modified phenolic foams. According to the preparation method, the toughed modified phenolic foams are prepared by the steps of modifying phenolic resin by using a composite toughening agent and carrying out mechanical stirring, high-temperature foaming, curing and molding. The use amount of the composite toughening agent is 1-20 percent by weight of the phenolic resin. The composite toughening agent contains polypyromellitimide which is rinsed by using n-pentane. According to the preparation method, as the new composite toughening agent and a new curing agent are introduced, the defects of low strength, large brittleness and easy generation of dregs of the phenolic foams are overcome. Compared with the prior art, the phenolic foams prepared by using the preparation method have the advantages of high percentage of close area, simple process and environment friendliness; and the mechanical property and heat resistance of the phenolic foams are effectively improved, therefore the requirement of a shipping process on performances of materials can be met.

Description

technical field [0001] The invention belongs to the field of polymer thermal insulation materials, and relates to a composite process and a foaming process; in particular, it relates to a preparation method of toughened modified phenolic foamed plastics. Background technique [0002] Commonly used polymer thermal insulation materials include polystyrene, polyurethane and phenolic (that is, foams of phenol and formaldehyde). Polystyrene and polyurethane have the advantages of light weight, low thermal conductivity, and high mechanical strength. They are widely used in light building materials, building energy conservation, major projects, and military facilities in the world. However, they have safety hazards such as flammability and high combustion toxicity. Phenolic has high dimensional stability, low thermal conductivity and good flame retardancy, and is an ideal thermal insulation material. [0003] Especially as a marine structural material, phenolic has some advantages...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L61/06C08L79/08C08L71/08C08K5/09C08K3/16C08K3/32C08J9/14
Inventor 张英杰安燕李晓峰沈石山董丽华尹衍升
Owner SHANGHAI MARITIME UNIVERSITY