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A kind of quick-drying bio-based water-based polyurethane coating based on stimulus response mode and preparation method thereof

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: 2022-08-02
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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  • A kind of quick-drying bio-based water-based polyurethane coating based on stimulus response mode and preparation method thereof
  • A kind of quick-drying bio-based water-based polyurethane coating based on stimulus response mode and preparation method thereof
  • A kind of quick-drying bio-based water-based polyurethane coating based on stimulus response mode and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] In the present embodiment, the quick-drying type internal emulsifier containing Schiff base is synthesized, such as image 3 shown, including the following steps:

[0034] (1) 4-aldehyde benzoic acid (1.5 g, 10 mmol) and sodium hydroxide (0.4 g, 10 mmol) were sequentially added to a mixed solution of ethanol / water (50 mL / 30 mL), and the reaction was stirred for ten minutes. In a weak alkaline solution, the carboxyl group in 4-aldehyde benzoic acid reacts with -OH of sodium hydroxide to obtain sodium 4-aldehyde benzoate, and reaction solution A is prepared.

[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 the sodium 4-aldehyde benzoate reacts with the amine group of the 2-amino-1,3 propanediol to synthesize a Schiff base, and then the reaction solution B is obtained.

[0036] (3) dropwise add acetic aci...

Embodiment 2

[0046] The synthetic route of the fast-drying internal emulsifier containing dynamic disulfide bonds in this example, such as Figure 4 shown, including the following steps:

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

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

Embodiment 3

[0068] The water-based polyurethane coatings of Example 1-2 and Comparative Example 1 were sprayed on the substrate, and the surface dryness and the dryness time were recorded with reference to GB / T 19250-2003, Image 6 It is the actual picture of the coatings of Example 1-2 and Comparative Example 1 sprayed on the substrate; according to the standard ISO1184-1983 "Determination of Tensile Properties of Plastic Films", the mechanics of water-based polyurethane coatings are tested by tensile testing machine; according to GB / T 6739-2006 "Determination of Hardness of Paint Films by Pencil Method of Paints and Varnishes" specifically requires that the hardness of coatings should be tested with a pencil scratch hardness tester. The results are shown in Table 1. It can be seen from Table 1 that both the surface dry time and the hard dry time in Examples 1 and 2 are significantly shortened. In terms of performance, the tensile strength and hardness of Examples 1 and 2 are also signi...

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Abstract

The invention discloses a low-temperature quick-drying bio-based water-based polyurethane coating based on a stimulus response method and a preparation method thereof. The raw materials include, according to the ratio of parts by mass: 33-46 parts of bio-based polyols; 25-36 parts of divalent isocyanates parts; 16-26 parts of quick-drying internal emulsifier; 1-2 parts of catalyst; 5-8 parts of neutralizer, 0-4 parts of pigment; 2-3 parts of stabilizer; 0-5 parts of filler; 0-5 parts of plasticizer 2 parts; 0-1 part of tackifier. The water-based polyurethane coating obtained in the present invention is a bio-based water-based polyurethane coating based on a stimulus-responsive internal emulsifier. Under certain stimulus conditions, the internal emulsifier can respond, and the hydrophilicity of the emulsifier is broken under regulation and control. , so that the polyurethane particles in the emulsion are precipitated from the aqueous solution, and the volatilization of water molecules is no longer affected by the aggregation of polymer particles and the diffusion, penetration and entanglement between polymer chains, and the goal of fast drying of coatings at low temperatures is achieved. This strategy The coatings below have excellent low-temperature and quick-drying properties, which 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 method 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. In the construction process of traditional solvent-based polyurethane coatings, a large amount of organic solvent needs to be added for dilution. It is inevitable that some toxic gases will be generated due to the volatilization of organic solvents, which will endanger human health and cause serious environmental pollution. Waterborne polyurethane is a new type of polyurethane system that uses water ins...

Claims

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Application Information

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Patent Type & Authority Patents(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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