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Asymmetric polyether dihydric alcohol and preparation method thereof

A polyether diol, asymmetric technology, applied in the field of asymmetric polyether diol, to achieve the effect of reducing the degree of dispersion

Inactive Publication Date: 2010-02-03
QILU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation methods of the above polyether diols (polyols) all carry out multi-point chain growth on the initiator simultaneously, so only symmetrical polyether diols can be prepared

Method used

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  • Asymmetric polyether dihydric alcohol and preparation method thereof
  • Asymmetric polyether dihydric alcohol and preparation method thereof
  • Asymmetric polyether dihydric alcohol and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] [Example 1] unsymmetrical polypropylene oxide diol

[0025] A, the synthesis of p-benzyloxyphenethyl alcohol

[0026] 16.6 grams of p-hydroxyphenethyl alcohol and 20.7 grams of potassium carbonate were dispersed in 500 milliliters of acetone, and 17.1 grams of benzyl bromide was added. The mixture was then refluxed at the boiling point of acetone (56° C.) for 6 hours, and the reaction was completed. The mixture was first concentrated to remove the solvent, filtered to remove potassium carbonate, washed three times with 3 mol / L potassium hydroxide solution, and finally washed with distilled water until neutral. The obtained solid was dried to constant weight under vacuum to obtain 18.2 g of p-benzyloxyphenethyl alcohol solid powder.

[0027] After analysis, the infrared and NMR data of p-benzyloxyphenethyl alcohol are: IR(cm -1 ): 3294.42, 3030.17, 2858.51, 1608.63, 1512.19, 1452.40, 1384.89, 1236.37, 1174.65, 1055.06, 1010.70. 1 H NMR δ(DMSO-d6): 2.64(t, 2H, C H 2...

Embodiment 2

[0035] [Example 2] unsymmetrical polypropylene oxide diol

[0036] A, the synthesis of p-benzyloxyphenethylate potassium

[0037] Disperse 10.0 grams of p-benzyloxyphenylpropanol and 2.96 grams of potassium tert-butoxide in 300 milliliters of cyclohexane, then heat the mixture to the azeotropic point of cyclohexane and tert-butanol, and use cyclohexane by azeotropic distillation Alkanes take tert-butanol out. When the distillate reaches 100 ml, stop the reaction. The remaining solvent was distilled off under dry conditions to obtain 10.9 grams of solid powder of potassium p-benzyloxyphenethylate.

[0038] C. Propylene oxide polymerization reaction

[0039] Add 10.1 grams of potassium p-benzyloxyphenethylate and 39.5 grams of propylene oxide obtained in the previous step into the closed reactor, heat to 35° C. and stir, and the polymerization ends after 8 hours. Distilled water was added to terminate the reaction and the pH value was adjusted to neutral with dilute hydrochl...

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PUM

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Abstract

The invention relates to an asymmetric polyether dihydric alcohol with the structure as shown in the formula (I). The structure is as follows: one terminal of a polymer chain is phenolic hydroxyl andthe other terminal thereof is alcoholic hydroxyl, and the phenolic hydroxyl can be in the ortho-position, meta-position or para-position of a methylene chain; m=2-3, n is the structural unit in the asymmetric polyether dihydric alcohol chain segment and R is -CH3 or CH2Cl. Meanwhile, the invention provides a synthetic method of the asymmetric polyether dihydric alcohol. Compared with the existingasymmetric polyether dihydric alcohol, the asymmetric polyether dihydric alcohol of the invention can effectively reduce the dispersity of the polymers when being used as a raw material to synthesizelinear polyurethane.

Description

technical field [0001] The invention relates to an unsymmetrical polyether diol, the two ends of the polymer chain are respectively terminated with alcoholic hydroxyl groups and phenolic hydroxyl groups. Background technique [0002] Since the development of the reaction route of polyol and isocyanate to synthesize polyurethane in the 1930s, polyether diol is an important polyurethane raw material, and its synthesis method has been extensively and deeply studied. The performance characteristics of polyurethane materials, such as flexibility, stiffness, weatherability, hardness, and elongation properties, can be tuned by changing raw materials, reactant ratios, and other reaction parameters. And changing the polyether diol used to prepare polyurethane is a recognized means to change the performance characteristics of materials. [0003] When reacting with isocyanate groups (-NCO), it has been clear that different types of hydroxyl compounds, especially alcoholic and phenolic...

Claims

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Application Information

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IPC IPC(8): C08G65/26C08G65/322C08G18/48
Inventor 杨鹏飞朱叙伟李天铎李俊英夏咏梅
Owner QILU UNIV OF TECH
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