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Quick-drying bio-based waterborne polyurethane coating based on stimulus response mode and preparation method of quick-drying bio-based waterborne polyurethane coating

A water-based polyurethane, stimuli-responsive technology, applied in the direction of polyurea/polyurethane coatings, coatings, etc., can solve the problems of complex preparation process, and achieve the effect of excellent low temperature and fast drying performance

Active Publication Date: 2022-04-15
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the preparation process of this two-component quick-drying coating is complicated, and it is far less convenient and efficient than the one-component coating in the actual operation process.

Method used

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  • Quick-drying bio-based waterborne polyurethane coating based on stimulus response mode and preparation method of quick-drying bio-based waterborne polyurethane coating
  • Quick-drying bio-based waterborne polyurethane coating based on stimulus response mode and preparation method of quick-drying bio-based waterborne polyurethane coating
  • Quick-drying bio-based waterborne polyurethane coating based on stimulus response mode and preparation method of quick-drying bio-based waterborne polyurethane coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] In this embodiment, the synthetic route diagram of the quick-drying type internal emulsifier containing Schiff base, such as image 3 As shown, it specifically includes the following steps:

[0034] (1) Add 4-formylbenzoic acid (1.5g, 10mmol) and sodium hydroxide (0.4g, 10mmol) to a mixed solution of ethanol / water (50mL / 30mL) in turn, and stir for ten minutes. In a weakly alkaline solution, the carboxyl group in 4-formylbenzoic acid reacts with —OH of sodium hydroxide to obtain sodium 4-formylbenzoate, and reaction solution A is obtained.

[0035] (2) The reaction solution A was added dropwise to 2-amino-1,3 propanediol (10 mmol), acetic acid was added as a catalyst, and the reaction was stirred at room temperature for 30 minutes. The aldehyde group in 4-formyl sodium benzoate reacts with the amine group of 2-amino-1,3 propanediol to form a Schiff base, and then the reaction solution B is obtained.

[0036](3) add acetic acid drop by drop to reaction solution B, separ...

Embodiment 2

[0046] In this example, the synthetic route of the fast-drying internal emulsifier containing dynamic disulfide bonds, such as Figure 4 As shown, it specifically includes the following steps:

[0047] (1) Dissolve 2,2'-dipyridine disulfide (11.206g, 50mmol) in 80mL of absolute ethanol, add 3-mercapto-1,2-propanediol (3.782g, 35mol), and add dropwise acetic acid as Catalyst, stirred at room temperature for 3h. The pyridyl disulfide in 2,2'-dipyridine disulfide undergoes disulfide exchange with the mercapto-SH group in 3-mercapto-1,2-propanediol in a weakly acidic environment to obtain 3-(pyridine-2 -dimercapto)-1,2-propanediol. After removing the solvent under reduced pressure, reaction solution A was obtained.

[0048] (2) The reaction solution A (4.346g, 20mmol) was dissolved in 60mL of absolute ethanol, 3-mercaptopropionic acid (2.122g, 20mmol) was added, and acetic acid was added dropwise as a catalyst, and stirred at room temperature for 2h. The pyridyl disulfide cont...

Embodiment 3

[0068] The water-based polyurethane coating of embodiment 1-2 and comparative example 1 is sprayed on the substrate, with reference to GB / T 19250-2003 record its surface dry and hard dry time, Figure 6 It is the coating spraying of embodiment 1-2 and comparative example 1 on the physical figure on the substrate; According to the standard ISO1184-1983 "Measurement of the Tensile Properties of Plastic Films", the mechanics of the waterborne polyurethane coating is tested by a tensile testing machine; according to GB / T 6739-2006 "Determination of paint film hardness by pencil method for paints and varnishes" specifically requires the use of a pencil scratch hardness tester to test the hardness of paint. The results are shown in Table 1. As can be seen from Table 1, the surface-drying time and hard-drying time in Examples 1 and 2 are all significantly shortened. In terms of performance, the tensile strength and hardness of Examples 1 and 2 are also significantly better than thos...

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Abstract

The invention discloses a low-temperature quick-drying bio-based waterborne polyurethane coating based on a stimulus response mode and a preparation method thereof, and the low-temperature quick-drying bio-based waterborne polyurethane coating comprises the following raw materials by mass: 33-46 parts of bio-based polyol; 25 to 36 parts of binary isocyanate; 16 to 26 parts of a quick-drying internal emulsifier; 1-2 parts of a catalyst; 5-8 parts of a neutralizer; 0-4 parts of a pigment; 2-3 parts of a stabilizer; 0-5 parts of a filler; 0-2 parts of a plasticizer; and 0-1 part of a tackifier. The water-based polyurethane coating obtained in the invention is a bio-based water-based polyurethane coating based on a stimulus-responsive internal emulsifier, under a certain stimulus condition, the internal emulsifier can generate a response behavior, and the hydrophilicity of the emulsifier is broken under regulation, so that polyurethane particles in an emulsion are promoted to settle from an aqueous solution; the volatilization of water molecules is not influenced by polymer particle aggregation and diffusion, permeation and winding among polymer chains any more, the aim of quickly drying the coating at low temperature is achieved, and the coating has excellent low-temperature quick-drying performance under the strategy and can fully meet various application occasions.

Description

technical field [0001] The invention belongs to the technical field of water-based polyurethane coatings, and in particular relates to a low-temperature quick-drying bio-based water-based polyurethane coating based on a stimulus response mode and a preparation method thereof. Background technique [0002] Polyurethane coating is a new type of coating developed after 1960. It has good wear resistance, solvent resistance, fatigue resistance and low temperature resistance. In recent years, it has been widely used in architectural decoration, rail transit, instrumentation, etc. During the construction of traditional solvent-based polyurethane coatings, a large amount of organic solvents need to be added for dilution, which will inevitably produce some toxic gases due to the volatilization of organic solvents, which will endanger human health and cause serious environmental pollution. Water-based polyurethane is a new type of polyurethane system that uses water instead of organic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D175/14C09D7/61
Inventor 唐俊涛雷陈栋申儒林喻桂朋潘春跃
Owner CENT SOUTH UNIV
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