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Novel castor-based polyurethane coating material and preparation method thereof

A polyurethane coating and castor-based technology, which is applied in the field of new castor-based polyurethane coating materials and its preparation, can solve the problems of limited production of castor-based polyurethane and achieve the effect of convenient storage and transportation

Pending Publication Date: 2022-06-07
NANKAI UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there have been reports on the preparation of new bio-based polyurethanes with a wide range of structural and functional properties by using edible oils such as soybean oil and palm oil, but the preparation of castor-based polyurethanes is still relatively limited. The research on synthesizing polyurethane via non-isocyanate route has not been reported yet.

Method used

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  • Novel castor-based polyurethane coating material and preparation method thereof
  • Novel castor-based polyurethane coating material and preparation method thereof
  • Novel castor-based polyurethane coating material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Example 1 Screening of reaction conditions for methylation of polyricinoleic acid

[0033] Using polyricinoleic acid with an acid value of 60 mg KOH / g as raw material, methyl esterification was carried out, and the optimum conditions for methyl esterification were discussed. Specific steps are as follows:

[0034]Add 10 g of polyricinoleic acid with an acid value of 60 mg KOH / g, 20 to 50 mL of methanol and 0.5 to 3 mL of boron trifluoride-methanol solution into a 50 mL flask. After refluxing for 6-16 h, methanol was removed by rotary evaporator. After adding 30 mL of diethyl ether to dilute, the mixture was transferred to a separatory funnel and washed with water 3 times. The solvent in the organic phase was removed to finally obtain a yellow oily liquid polymethyl ricinoleate.

[0035] Table 1 Screening of reaction conditions for methylation of polyricinoleic acid

[0036]

[0037]

[0038] After screening the conditions, the optimal conditions for the No. 2 ...

Embodiment 2

[0039] Example 2 Screening of reaction conditions for epoxidation of methyl polyricinoleate

[0040] Taking the polyricinoleic acid methyl ester in Example 1 as a raw material, epoxidation was carried out, and the optimum conditions of epoxidation were explored. Specific steps are as follows:

[0041] Disperse 8.6 g of methyl polyricinoleate uniformly in 40-60 mL of diethyl ether, slowly add 5-8 g of m-chloroperoxybenzoic acid, and stir the reaction at room temperature for 12-36 h. Wash with 30 mL of saturated sodium thiosulfate solution, 30 mL of saturated sodium bicarbonate solution and 30 mL of saturated sodium chloride solution successively 3 times. Finally, the ether in the organic phase was removed to obtain a colorless oily liquid epoxidized methyl polyricinoleate.

[0042] Table 2 Screening of reaction conditions for epoxidation of methyl polyricinoleate

[0043]

[0044] After screening of conditions, the No. 3 reaction conditions were selected as the optimal co...

Embodiment 3

[0045] Example 3 Polyepoxidized methyl ricinoleate and CO 2 Screening of cycloaddition reaction conditions

[0046] 7.05g of epoxidized polymethyl ricinoleate obtained in Example 2 was dissolved in 30~40mL DMF and transferred to the autoclave, then 0.14~0.35g (0.66mmol) of tetrabutylammonium bromide was added, and the Carbon dioxide to 2~5MPa, react at 120~140℃ for 18~36h. After the reaction, the catalyst was washed with water to remove the catalyst, and the solvent in the organic phase was removed to obtain a yellow-brown oily liquid, namely polycyclocarbonate methyl ricinoleate.

[0047] Table 3 Polyepoxidized methyl ricinoleate and CO 2 Screening of cycloaddition reaction conditions

[0048]

[0049] After screening the conditions, the conditions for the No. 2 reaction were selected as the best, namely: the amount of catalyst tetrabutylammonium bromide was 3% of the mass of the substrate polyepoxy ricinoleate, and the amount of solvent DMF was 4.2 mL / g polycyclic Met...

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Abstract

The invention relates to a novel castor-based polyurethane coating material and a preparation method thereof.The preparation method comprises the steps that oligomeric ricinoleic acid with different acid values serves as a raw material, carboxyl in the oligomeric ricinoleic acid is subjected to methyl esterification, and polyricinoleic acid methyl ester is formed; then, double bonds in polyricinoleic acid methyl ester molecules are subjected to epoxidation; and further performing cycloaddition reaction on the obtained epoxidized methyl polyricinoleate and carbon dioxide to prepare the polycyclic carbonate methyl ricinoleate containing 3-8 cyclic carbonate structural units as a polyurethane precursor. The polyurethane precursor reacts with polyamine, and obtained polyurethane has water resistance and acid and alkali resistance, is stable at the temperature of 200 DEG C and can be used as a coating material. The process is clean and pollution-free, non-edible oil castor oil is used as a raw material, and the development concept that biomass does not comply with people for grains is met.

Description

technical field [0001] The invention relates to a novel castor-based polyurethane coating material and a preparation method thereof, belonging to the technical field of polyurethane preparation. Background technique [0002] Polyurethane is currently the most versatile polymer material, with excellent properties such as abrasion resistance, elasticity, durability and toughness. Given the advantages of polyurethanes in terms of overall performance, they have a wide range of applications in many fields such as foams, footwear, coatings and paints, industrial machinery, adhesives, packaging, and medical devices. In order to meet the growing global market demand, optimizing product properties and preparation methods has become a research hotspot in the field of polyurethane. [0003] The currently commonly used methods of polyurethane synthesis mainly rely on the polyaddition reaction between isocyanates and polyols. The key monomer isocyanate is mainly derived from fossil res...

Claims

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Application Information

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IPC IPC(8): C09D175/04C08G71/04
CPCC09D175/04C09D5/18C08G71/04Y02P20/584
Inventor 任方煜李红茹叶锋王庆瑞崔晓莹何良年
Owner NANKAI UNIV
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