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Combined polyether and composition for preparing polyurethane rigid foam and application method thereof

A technology for rigid foam and combined polyether, which is applied in the field of combined polyether for preparing rigid polyurethane foam and the composition for preparing rigid polyurethane foam, can solve the problems of high construction temperature, poor dimensional stability of polyurethane foam, and combined polyether. Ether can not meet the requirements of low temperature construction and other problems, and achieve the effect of wide application range, wide construction temperature range and strong adhesion

Inactive Publication Date: 2011-06-01
SHANGHAI DONGDA POLYURETHANE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art that the combined polyether cannot meet the requirements of low-temperature construction, the construction temperature is high, and the dimensional stability of the obtained polyurethane foam is not good, and a method for preparing polyurethane rigid foam is provided. Combined polyether and its use method, the combined polyether can be constructed in a low temperature environment, and the obtained rigid polyurethane foam has good dimensional stability

Method used

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  • Combined polyether and composition for preparing polyurethane rigid foam and application method thereof
  • Combined polyether and composition for preparing polyurethane rigid foam and application method thereof
  • Combined polyether and composition for preparing polyurethane rigid foam and application method thereof

Examples

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Effect test

Embodiment 1

[0037] Preparation of combined polyether:

[0038] According to the formula and order listed in Table 1, carry out thorough mixing in a stainless steel mixing tank for 2-5 hours to form the polyurethane combination polyether of the present invention. The combination polyether is a reddish-brown transparent liquid with a hydroxyl value of 230 mgKOH / g. Viscosity 115mPa.s (25°C).

[0039] Table 1

[0040]

[0041] The preparation method of polyurethane rigid foam:

[0042] Pass the prepared combined polyether through a high-pressure machine, and conduct an exterior wall spraying test at a low temperature of -20°C, perform layered spraying after base treatment, and obtain polyurethane rigid foam. The mass ratio of combined polyether to isocyanate is 1:1.

Embodiment 2

[0044] Preparation of combined polyether:

[0045] According to the formula and order listed in Table 2, carry out thorough mixing in a stainless steel mixing tank for 2 hours to form the polyurethane combined polyether of the present invention, which is a reddish-brown transparent liquid with a hydroxyl value of 300 mgKOH / g and a viscosity of 138 mPa .s (25°C).

[0046] Table 2

[0047]

[0048]

[0049] The preparation method of polyurethane rigid foam:

[0050] Pass the prepared combined polyether through a high-pressure machine, and conduct an exterior wall spraying test at a low temperature environment of -20°C, and perform layered spraying after the base layer treatment to obtain polyurethane rigid foam. Wherein the mass ratio of combined polyether and isocyanate is 1:1.

Embodiment 3

[0052] Preparation of combined polyether:

[0053] According to the formula and sequence listed in Table 3, carry out thorough mixing in a stainless steel mixing tank for 2 hours to form the polyurethane combined polyether of the present invention, which is a reddish-brown transparent liquid with a hydroxyl value of 235 mgKOH / g and a viscosity of 107 mPa .s (25°C).

[0054] table 3

[0055]

[0056] The preparation method of polyurethane rigid foam:

[0057] Pass the prepared combined polyether through a high-pressure machine, and conduct an exterior wall spraying test at a low temperature environment of -20°C, and perform layered spraying after the base layer treatment to obtain polyurethane rigid foam. Wherein the mass ratio of combined polyether and isocyanate is 1:1.2.

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Abstract

The invention discloses a combined polyether for preparing polyurethane rigid foam and an application method thereof. The combined polyether comprises polyether polyol DS400, benzoic anhydride polyester polyol, foam stabilizer, polyurethane synthetic catalyst, foaming agent and water. The invention also discloses a composition for preparing polyurethane rigid foam, which comprises the combined polyether for preparing polyurethane rigid foam and isocyanate, wherein the mass ratio of the combined polyether to the isocyanate is 1:1-1:1.2. The invention overcomes the defects that the combined polyether can not meet the requirements for low-temperature construction in the prior art, the construction temperature is high, the prepared polyurethane foam has poor dimensional stability and the like, and provides a combined polyether for preparing polyurethane rigid foam and an application method thereof. The combined polyether can be used for construction in the low-temperature environment, andthe prepared polyurethane rigid foam has high dimensional stability.

Description

technical field [0001] The invention relates to the field of polyurethane rigid foam foaming, in particular to a combined polyether for preparing polyurethane rigid foam and a method for using the same. The invention also relates to a composition containing the combined polyether for preparing rigid polyurethane foam. Background technique [0002] Polyurethane rigid foam is a polymer composite material with superior performance. It has the characteristics of low density, high strength, good heat preservation effect, and high bonding strength. It is currently recognized as the best heat insulation material and has been widely used in refrigerators. , refrigerated containers, building insulation, transportation, petrochemical pipelines and military aviation and other aspects. Especially in building insulation and cold storage spraying polyurethane, because it can be molded at one time, and it is organically combined with buildings, it has been widely used. However, polyureth...

Claims

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Application Information

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IPC IPC(8): C08G18/66C08G18/50C08G18/32C08K5/521C08G101/00
Inventor 李心强董建国王振波信延垒
Owner SHANGHAI DONGDA POLYURETHANE
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