A kind of preparation method of polyimide foam and insulation pipe cover thereof

A technology of polyimide and foam, which is applied in the field of preparation of polyimide foam and its insulation pipe sleeve, can solve the problems of low-efficiency utilization of organic carbon resources, occupation of land, pollution of the environment, etc., and achieves excellent performance and effect , enhanced toughness, good heat insulation performance

Active Publication Date: 2021-07-23
自贡中天胜新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Polyimide foam has the characteristics of low density and intrinsic flame retardancy. Using traditional methods such as landfill and incineration to dispose of polyimide foam scraps not only occupies land, pollutes the environment, but also causes inefficient utilization of organic carbon resources.

Method used

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  • A kind of preparation method of polyimide foam and insulation pipe cover thereof
  • A kind of preparation method of polyimide foam and insulation pipe cover thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] In parts by weight, add 100 parts of 3,3',4,4'-benzophenone tetra-acid dianhydride into 60 parts of polymethylene polyphenyl polyisocyanate and heat to 80°C, react for 0.4h, Let it pre-react 10% of the total mass, then add 50 parts of the blocking agent trihaloethanol to block the isocyanate, and then add 10 parts of the surfactant DC 200 to it, and disperse it by stirring at 600r / min and ultrasonic at 50KHZ Mix it thoroughly and evenly. Cool to normal temperature and become solid and slightly brittle, pulverize and pulverize with a 1000W ultrafine pulverizer for 0.2h to 1000 mesh as a binder for use;

[0033] The polyimide foam leftovers are crushed into foam particles with a particle size of 25mm by a foam pulverizer, and 20 parts of the adhesive obtained after the crushing in the preceding steps and 100 parts of the foam particles after the crushed leftovers are taken, and passed through a 2000W closed screw mixer Mix well; then fill it into a mold and place it in a...

Embodiment 2

[0035] Add 100 parts of 1,2,4,5-pyromellitic dianhydride to 100 parts of toluene diisocyanate and heat to 150°C, react for 3 hours, let it react 50% in advance, and then add 50 parts of blocking agent ortho Hydroquinone, the isocyanate is blocked, and then 15 parts of surfactant AK8803 is added to it, and it is fully mixed by 800r / min stirring and 60KHZ ultrasonic disperser. Cool to normal temperature and become solid and slightly brittle, pulverize with a 2000W ultrafine pulverizer for 3 hours to 2000 mesh as a binder for later use;

[0036]The polyimide foam scraps are pulverized into foam particles with a particle size of 5 mm by a foam pulverizer, and 200 parts of crushed adhesive and 100 parts of foam are taken and mixed thoroughly by a 160KW closed screw mixer; then filled into a mold , placed in an industrial microwave oven, the microwave power is 60KW, and the microwave foaming time is controlled to be 2h; after the temperature reaches 180°C, the isocyanate deblocks, r...

Embodiment 3

[0038] Add 100 parts of 3,3',4,4'-diphenyl ether tetra-acid dianhydride to 70 parts of isophorone diisocyanate and heat to 60°C, react for 0.3h, let it react 5% in advance, and then add 35 parts of capping agent ethanol is used to block isocyanate, and then 5 parts of surfactant AK8805 are added to it, and it is fully mixed evenly by stirring at 500r / min and ultrasonic disperser at 150KHZ. Cool to normal temperature and become solid and slightly brittle, pulverize with a 1500W ultrafine pulverizer for 0.2h to 1500 mesh as a binder for use;

[0039] The polyimide foam scraps are pulverized into foam particles with a particle size of 50 mm by a foam pulverizer, and 10 parts of pulverized adhesive and 100 parts of foam are fully mixed by a closed screw mixer; then filled into a mould, Placed in an industrial microwave oven, the microwave power is 60KW, and the microwave foaming time is controlled to be 2 hours; after the temperature reaches 190°C, the isocyanate deblocks, reacts ...

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Abstract

The invention discloses a preparation method of a polyimide foam and a thermal insulation pipe cover thereof. The method comprises the following steps: adding the aromatic dianhydride into the isocyanate and heating it to let it react partly in advance, then adding a blocking agent, adding a surfactant and fully mixing it evenly. After cooling, pulverize it with an ultrafine pulverizer and use it as a binder. Crush polyimide foam scraps into foam particles, take an appropriate amount of pulverized adhesive and foam particles and mix them well, then fill them into a mold, place them in an industrial microwave oven for microwave foaming and imidization to obtain polyimide foam ; After the reaction is complete, the polyimide foam pipe sleeve is obtained by demoulding. The method uses polyimide foam scraps as raw materials, and can realize high-efficiency and green recycling of polyimide foam. The polyimide foam pipe sleeve prepared by the invention has good temperature resistance, extremely low moisture absorption rate, good toughness, convenient and simple installation, short preparation cycle and low energy consumption, the whole process is solvent-free, environmentally friendly and non-toxic, and is easy for industrialized production.

Description

technical field [0001] The invention relates to the technical field of pipeline heat preservation, in particular to a preparation method of polyimide foam and heat preservation pipe sleeve. Background technique [0002] The traditional sleeve materials are mainly rock wool, glass fiber material, polyethylene foam (PEF), phenolic foam and polyurethane foam. Rock wool and fiber materials have a high density and will fall off during installation and use. The fallen fibers will cause harm to human health. The material has an open-pore structure with a high water vapor permeability, which leads to a decrease in thermal conductivity with the prolongation of use time. Higher, the insulation effect is greatly reduced; foamed polyethylene (PEF): continuous pore structure, high water vapor permeability, its material is hard and brittle, easy to break, short life; phenolic foam is brittle and easy to pulverize , when cutting and forming, it is easy to break, generate dust, and the con...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J9/33C08J9/35C08J9/02C08L79/08C08G73/10
Inventor 李超程杰黄勇
Owner 自贡中天胜新材料科技有限公司
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