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Diisocyanate, polyurethane prepolymer, preparation method of polyurethane prepolymer and waterborne polyurethane

A polyurethane prepolymer and diisocyanate technology, applied in the field of polyurethane, can solve the problems of poor molecular chain hydrophilicity, poor storage stability, and low proportion of soft segments, and achieve good hydrophilicity, high stability, and high proportion of soft segments. Effect

Active Publication Date: 2016-03-09
SHANGHAI GOLD LION CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The prepolymers currently prepared have problems such as poor hydrophilicity of molecular chains and low proportion of soft segments, resulting in the problems of large emulsion particle size, poor storage stability and poor flexibility after film formation in the final water-based polyurethane products.

Method used

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  • Diisocyanate, polyurethane prepolymer, preparation method of polyurethane prepolymer and waterborne polyurethane
  • Diisocyanate, polyurethane prepolymer, preparation method of polyurethane prepolymer and waterborne polyurethane
  • Diisocyanate, polyurethane prepolymer, preparation method of polyurethane prepolymer and waterborne polyurethane

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Experimental program
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preparation example Construction

[0049] The invention provides a kind of preparation method of polyurethane prepolymer, comprises the following steps:

[0050] The diisocyanate described in the above technical scheme is mixed with the hydroxyl-terminated polymer to obtain a polyurethane prepolymer;

[0051] Described polyurethane prepolymer comprises the repeating unit of structure shown in formula (II):

[0052]

[0053] In the formula (II), R is the remaining residue after removing 2 terminal hydroxyl groups from the hydroxyl-terminated polymer, and Q is removing the remaining 3 residues of -N=C=O from the HDI trimer or removing 3- from the IPDI trimer. N=C=O remaining residues; n is the degree of polymerization.

[0054] In the preparation method of the polyurethane prepolymer provided by the present invention, firstly, the diisocyanate and the diol are mixed and reacted. Wherein, the glycol preferably includes one or more of polypropylene glycol, polycaprolactone glycol, polycarbonate glycol and polyte...

Embodiment 1

[0067] Preparation of diisocyanates

[0068] Add 75g (0.1mol) of polyethylene glycol monomethyl ether with a number-average molecular weight of 750 and 71g of IPDI trimer into a three-neck flask, stir and heat up to 80°C and keep it warm for 4 hours to obtain diisocyanate.

[0069] Adopt di-n-butylamine to the isocyanate group (-N=C=O) content titration test in the reaction system before and after the reaction, the test result shows: the content of the isocyanate group in the reaction system before the reaction is 5.84wt%, and the reaction system after the reaction The content of the isocyanate group in is 3.89wt%. According to the test results, it can be proved that 1 / 3 of the isocyanate groups in the IPDI trimer participate in the reaction, thus proving that the diisocyanate prepared in this embodiment has the structure of formula (I). At the same time, it can be judged according to the type of reaction raw materials that Q in the diisocyanate having the structure of formul...

Embodiment 2

[0071] Preparation of Waterborne Polyurethane

[0072] In a 250ml four-necked flask equipped with a stirrer, a condensing reflux tube, and a thermocouple, add 25g (about 0.017mol) of the diisocyanate prepared in Example 1, 24.6g (about 0.0123mol) of polytetrahydrofuran dihydrofuran with a number average molecular weight of 2000 Alcohol, 0.01 g of dibutyltin dilaurate, and react at 90° C. for 4 hours to obtain a polyurethane prepolymer.

[0073] Carry out infrared spectroscopic analysis to described polyurethane prepolymer, can draw according to the kind of infrared spectroscopic analysis result and reaction raw material: described polyurethane prepolymer is made up of repeating unit with formula (II) structure, in formula (II), R is the remaining residue after removing two terminal hydroxyl groups from polytetrahydrofuran diol, Q is a substituent of formula (b), n=17.

[0074] After the polyurethane prepolymer is cooled to 55°C, add 20g of acetone to reduce the viscosity, the...

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Abstract

The invention relates to the field of polyurethane, in particular to diisocyanate, a polyurethane prepolymer, a preparation method of the polyurethane prepolymer and waterborne polyurethane. The polyurethane prepolymer includes a repeating unit with the structure shown in a formula (II), wherein in the formula (II), the R represents a left residue of a terminal hydroxyl polymer without two terminal hydroxyl groups, the Q represents a left residue of an HDI tripolymer without three -N = C = O or a left residue of an IPDI tripolymer without three -N = C = O, and the n represents the polymerization degree. The waterborne polyurethane is prepared by dispersing the polyurethane prepolymer in water, and the waterborne polyurethane is small in emulsion particle size, high in stability and good in softness after film forming. An experimental result shows that the emulsion particle size of the prepared waterborne polyurethane is 51-91 nm, no obvious stratification phenomenon is produced after a centrifugal test; after film forming, the Shore hardness is 42-53, the tensile strength is 14-19 MPa, and the elongation at break is 630-800%. (shown in the description).

Description

technical field [0001] The application relates to the field of polyurethane, in particular to a diisocyanate, a polyurethane prepolymer, a preparation method of the polyurethane prepolymer and water-based polyurethane. Background technique [0002] The full name of polyurethane is polyurethane, which is a general term for macromolecular compounds containing repeated carbamate groups on the main chain, while water-based polyurethane refers to a polyurethane system made of water instead of organic solvents as the dispersion medium. Waterborne polyurethane can be widely used in coatings, adhesives, fabric coating and finishing agents, leather finishing agents, paper surface treatment agents and fiber surface treatment agents, and has replaced organic solvent-based polyurethanes as an important direction for the development of the polyurethane industry. [0003] The whole preparation process of waterborne polyurethane is mainly divided into two stages: first, the oligomer diol, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/10C08G18/32C08G18/42C08G18/48C08G18/66C08G18/79C08J3/03
CPCC08G18/10C08G18/3228C08G18/4277C08G18/4825C08G18/4854C08G18/6614C08G18/6685C08G18/792C08J3/03C08J2375/08
Inventor 赵旭忠钟望杨斯盛石碧郭永彪
Owner SHANGHAI GOLD LION CHEM CO LTD
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