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Polyurethane foamed material, and preparation method and packing method thereof

A technology of polyurethane foam and polyester polyol, applied in the field of polyurethane foam materials, can solve the problems of slow increase in strength, limited strength, time-consuming and labor-intensive taphole mud, etc., and achieve the effects of simple operation, strong on-site practicability, and short curing time.

Inactive Publication Date: 2019-01-29
RAILWAY ENG RES INST CHINA ACADEMY OF RAILWAY SCI +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, the blasting and excavation of underground tunnels often adopts non-filling blasting, that is, using explosives instead of filling materials, that is, filling with blasting mud. Due to the limited materials for blasting mud at the construction site, manual filling of blasting mud is time-consuming and labor-intensive, which affects blasting efficiency and construction. progress, and there is a lot of water in the cracks of the blast holes, the mud bubbles become thinner and softer, and the sealing effect cannot be achieved
[0003] The principle of traditional one-component polyurethane is that after spraying out of the polyurethane material container, it reacts slowly with the moisture in the environment. Generally, it takes 4-5 hours for the surface to dry, and it is completely cured for more than 24 hours. The strength rises slowly. Add a catalyst to the polyurethane raw material. Due to the contact of the catalyst with polyol and isocyanate, it will catalyze the polyurethane reaction, making the material cured and invalid

Method used

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  • Polyurethane foamed material, and preparation method and packing method thereof
  • Polyurethane foamed material, and preparation method and packing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Mix components such as microcapsule-coated catalyst, polyethylene glycol phthalate, and tris(2-chloropropyl) phosphate according to the proportions of each component in Table 1 to obtain a combined polyol; Combine polyols and polyphenylpolymethylene polyisocyanate as polyisocyanate into the aerosol can in turn, press the valve, pour dimethyl ether into the aerosol can, shake and mix for 1 minute, and test the product after standing for 24 hours Performance, as shown in Table 2.

[0050] If the microcapsule-coated catalyst is not added in the above embodiment, and the polyurethane is cured by water vapor in the air, the measured surface dry time is 1800 s, and the curing time is 24 hours. It can be seen that the surface dry time and curing time of the polyurethane foam material added with the microcapsule-coated catalyst according to the embodiment of the present invention are greatly shortened.

Embodiment 2-4

[0052] According to the formula listed in table 1, technological process is with embodiment 1. Examples 2-4 By changing the type and amount of combined polyols and using different types of polyols, products with different properties are obtained, as shown in Table 2.

[0053] Table 1

[0054]

[0055]

[0056] Table 2

[0057] Example number

1

2

3

4

Surface dry time / s

570

400

250

240

Curing time / min

31

29

24

20

Maximum reaction temperature / ℃

19

19

21

23

30min shear strength / MPa

0.14

0.15

0.17

0.17

30min compressive strength / MPa

0.20

0.22

0.25

0.27

Volume expansion rate / times

3

4

4

5

Oxygen Index / %

26

26

27

28

[0058] It can be seen from the performance tests of the polyurethane foam materials with different material ratios in the above examples that the polyurethane foam materials obtained based on the polyuretha...

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Abstract

The invention provides a polyurethane foamed material, and a preparation method and packing method thereof. The polyurethane foamed material includes 0.1-2 parts by mass of a microcapsule coated catalyst, 10-60 parts by mass of polyester polyols and / or polyether polyols, 0.5-3 parts by mass of a foam stabilizer, 1-20 parts by mass of a flame retardant, 30-100 parts by mass of polyisocyanate, and 5-40 parts by mass of a foaming agent. The provided polyurethane foamed material is short in curing time, and can meet demands of blasting borehole packing construction; and the foamed material, the preparation method and the packing method are simple and convenient in operation, especially the method for packing the foamed material in boreholes, which is strong in field practicality and especiallysuitable for the blocking of small diameter boreholes such as tunnel excavation, building demolition, vertical blasthole and underwater blasting in well lanes.

Description

technical field [0001] The invention relates to the technical field of blasting, in particular to a polyurethane foam material, a preparation method of the polyurethane foam material and a filling method. Background technique [0002] At present, the blasting and excavation of underground tunnels often adopts non-filling blasting, that is, using explosives instead of filling materials, that is, filling with blasting mud. Due to the limited materials for blasting mud at the construction site, manual filling of blasting mud is time-consuming and labor-intensive, which affects blasting efficiency and construction. progress, and there is a lot of fissure water in the blast holes, the mud bubbles become thinner and softer, and the sealing effect cannot be achieved. [0003] The principle of traditional one-component polyurethane is that after spraying out of the polyurethane material container, it reacts slowly with the moisture in the environment. Generally, it takes 4-5 hours f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/76C08G18/48C08G18/42C08G18/18C08G18/20C08J9/14C08K5/521F42D1/12F42D1/26C08G101/00
CPCC08G18/1808C08G18/1816C08G18/1825C08G18/2081C08G18/4018C08G18/4211C08G18/4854C08G18/7664C08G2101/00C08J9/142C08J2203/12C08J2375/06C08J2375/08C08K5/521F42D1/12F42D1/26
Inventor 孟海利薛里郑新国康永全董全霄杨年华李书明孙崔源郭云龙杨立荣张嘉林
Owner RAILWAY ENG RES INST CHINA ACADEMY OF RAILWAY SCI
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