Method for preparing rigid polyurethane foam from epoxidized lignin polyol

A polyurethane rigid foam and lignin technology, which is applied in the field of epoxidized lignin polyols to prepare polyurethane rigid foam, can solve the problems of many side reactions and poor thermal stability, and achieve less side reactions, strong thermal stability, and high uniformity sex and regularity effects

Inactive Publication Date: 2021-09-24
CHINA NAT PULP & PAPER RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the technical problems that there are many side reactions in the preparation process of polyurethane rigid foam materials in the prior art, and the mechanical properties and thermal stability of the prepared lignin-based polyurethane rigid foam materials are poor, the invention provides an epoxy Method for preparing polyurethane rigid foam by chemical lignin polyol

Method used

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  • Method for preparing rigid polyurethane foam from epoxidized lignin polyol
  • Method for preparing rigid polyurethane foam from epoxidized lignin polyol
  • Method for preparing rigid polyurethane foam from epoxidized lignin polyol

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Embodiment 1

[0024] The preparation method of embodiment 1 polyurethane rigid foam

[0025] Add polyether polyol (PEG-400) into a plastic beaker, then add lignin polyol and stir evenly for 4 minutes, the molar ratio of the hydroxyl value of lignin polyol to polyether polyol is 2:8, and then add catalyst two Butyl tin dilaurate, foam stabilizer silicone oil AK-8805 and foaming agent water, mix well and then stir for 4 minutes, finally add a certain amount of isocyanate (polymeric MDI) according to the number of isocyanate (NCO / OH) is 1.05, and use electric stirring When the rotating speed reaches 2000r / min, stir rapidly for 40s to carry out free foaming to prepare lignin-based polyurethane rigid foam material.

[0026] The number of isocyanates is determined according to the total molar weight of isocyanate in isocyanates and the total hydroxyl value of lignin polyols and polyether polyols. The formula for calculating the number of isocyanates is as follows:

[0027] NCO / OH=M MDI ×W MDI ...

Embodiment 2

[0029] The preparation method of embodiment 2 polyurethane rigid foam

[0030] Add polyether polyol (PEG-400) into a plastic beaker, then add lignin polyol and stir evenly for 4 minutes, the molar ratio of the hydroxyl value of lignin polyol to polyether polyol is 3:7, and then add catalyst two Butyl tin dilaurate, foam stabilizer silicone oil AK-8805 and foaming agent water, mix well and then stir for 4 minutes, finally add a certain amount of isocyanate (polymeric MDI) according to the number of isocyanate (NCO / OH) is 1.05, and use electric stirring When the rotating speed reaches 2000r / min, stir rapidly for 40s to carry out free foaming to prepare lignin-based polyurethane rigid foam material.

[0031] The number of isocyanates is determined according to the total molar weight of isocyanate in isocyanates and the total hydroxyl value of lignin polyols and polyether polyols. The formula for calculating the number of isocyanates is as follows:

[0032] NCO / OH=M MDI ×W MDI ...

Embodiment 3

[0034] The preparation method of embodiment 3 polyurethane rigid foam

[0035] Add polyether polyol (PEG-400) into a plastic beaker, then add lignin polyol and stir evenly for 4 minutes, the molar ratio of the hydroxyl value of lignin polyol to polyether polyol is 4:6; then add catalyst two in sequence Butyl tin dilaurate, foam stabilizer silicone oil AK-8805 and foaming agent water, mix well and then stir for 4 minutes, finally add a certain amount of isocyanate (polymeric MDI) according to the number of isocyanate (NCO / OH) is 1.05, and use electric stirring When the rotating speed reaches 2000r / min, stir rapidly for 40s to carry out free foaming to prepare lignin-based polyurethane rigid foam material.

[0036] The number of isocyanates is determined according to the total molar weight of isocyanate in isocyanates and the total hydroxyl value of lignin polyols and polyether polyols. The formula for calculating the number of isocyanates is as follows:

[0037] NCO / OH=M MDI ...

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Abstract

The invention belongs to the technical field of preparation methods of rigid polyurethane foam, and discloses a method for preparing rigid polyurethane foam from epoxidized lignin polyol. The method comprises the following steps: adding polyether polyol into a reactor, adding lignin polyol, uniformly stirring, sequentially adding a catalyst, a foam stabilizer and a foaming agent, mixing, uniformly stirring, finally adding quantitative isocyanate, quickly stirring, and freely foaming to obtain the lignin-based rigid polyurethane foam material. The hydroxyl value ratio of the lignin polyol to the polyether polyol is (2: 8)-(4: 6). According to the method for preparing the lignin-based rigid polyurethane foam material, side reactions are few, and the prepared lignin-based rigid polyurethane foam material is excellent in mechanical property, high in uniformity and regularity of the structure and high in thermal stability.

Description

technical field [0001] The invention belongs to the technical field of polyurethane rigid foam preparation methods, and in particular relates to a method for preparing polyurethane rigid foam by epoxidizing lignin polyols. Background technique [0002] Polyurethane is a polymer with urethane (-NH-COO-) repeating structural unit formed by the reaction of dibasic or polybasic organic isocyanate and polyol compound. It can be used in construction, packaging, insulation, bedding, decoration, shoes Classes and auto parts and other fields. In industrial production, polyols, one of polyurethane raw materials, mostly come from petrochemical product intermediates, which have disadvantages such as toxicity and corrosion. Lignin, as the second most abundant renewable polymer on earth, is mainly formed by linking substituted phenylpropyl units. It has various functional groups such as phenolic hydroxyl groups and alcoholic hydroxyl groups. These groups can replace polyols and react wit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/76C08G18/64C08G18/48C08H7/00C08G101/00
CPCC08G18/4833C08G18/6492C08G18/4081C08G18/7671C08H6/00C08G2101/00C08G2110/0025C08G2110/0083
Inventor 吴苗彭建军陈铃华陈雪梅张权
Owner CHINA NAT PULP & PAPER RES INST CO LTD
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