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Waterborne polyurethane, and preparation method and application thereof

A water-based polyurethane, reaction technology, applied in the directions of polyurea/polyurethane coatings, polyurea/polyurethane adhesives, sulfide preparation, etc. Effects of Excessive Stress

Active Publication Date: 2021-01-01
SOUTH CHINA AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above examples are all based on petroleum base, which does not meet the requirements of green environmental protection.

Method used

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  • Waterborne polyurethane, and preparation method and application thereof
  • Waterborne polyurethane, and preparation method and application thereof
  • Waterborne polyurethane, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0096]This example provides a series of chain extenders NACCO, which are prepared by the click reaction of castor oil (CO) and N-acetyl-L-cysteine ​​(NAC). The specific process is as follows.

[0097]First, an appropriate ratio of NAC, CO and photoinitiator (4wt.%) were dissolved in absolute ethanol and transferred to a quartz tube. Under the ultraviolet irradiation of 350W power, the reaction time is certain (reaction equipment such asfigure 1 ). After that, the product was extracted with ethyl acetate and dried with anhydrous magnesium sulfate. The product was filtered and rotary evaporated to remove ethyl acetate, and then dried overnight under vacuum at 45°C to obtain the chain extender NACCO.

[0098]Specifically, two photoinitiators (1173, ITX), 6 different reaction times (5min, 10min, 15min, 20min, 25min and 30min) and 6 different sulfhydryl / double bond molar ratios (1:1, 2: 1, 3:1, 4:1, 5:1 and 6:1), the obtained chain extenders were named NACCO-p, NACCO-T and NACCO-m, where p, T ...

Embodiment 2～9

[0122]This example provides a series of chain extenders, which are prepared by the click reaction of castor oil and N-acetyl-L-cysteine ​​derivatives. The structural parameters of N-acetyl-L-cysteine ​​derivatives are shown in Table 4 Shown.

[0123]Table 4 The structure of N-acetyl-L-cysteine ​​derivatives

[0124]

[0125]Castor oil and N-acetyl-L-cysteine ​​derivatives perform a click reaction

[0126]The N-acetyl-L-cysteine ​​derivatives (derivatives 1-8), CO and photoinitiator (4wt.%) were dissolved in absolute ethanol and transferred to a quartz tube. Under the UV irradiation of 350W power, the reaction time is 15min. After that, the product was extracted with ethyl acetate and dried with anhydrous magnesium sulfate. The product was filtered and rotary evaporated to remove ethyl acetate, and then dried overnight at 45°C in a vacuum environment to obtain a chain extender, which was recorded as Examples 2-9 in turn. Table 5 shows its performance characteristics.

[0127]Table 5 The acid value,...

Embodiment 10

[0130]This example provides a series of waterborne polyurethane emulsions, using NACCO (NACCO-4:1) provided in Example 1 as a chain extender, and prepared by the following process.

[0131]Such asFigure 6 , Polyol (PPG, PCDL, CO, castor oil derivatives) and isophorone diisocyanate (IPDI) were added to a two-neck flask equipped with mechanical stirring, and stirred and mixed at 78°C for 10 min. Then, dibutyltin laurate (DBTDL) (1% mass fraction of polyol) was added to the mixture, and then reacted for 20 minutes. Subsequently, the NACCO chain extender was dissolved in methyl ethyl ketone (MEK) and added dropwise to the mixture with stirring. The dropwise addition was completed within 60 minutes. The amount of reactant is shown in Table 6. After the reaction, 5-10 mL of MEK was poured into the mixture to reduce the viscosity of the system. Then, when the temperature is cooled to room temperature, the system is neutralized with TEA and stirred for about 30 minutes. Finally, the mixture wa...

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Abstract

The invention relates to waterborne polyurethane, and a preparation method and application thereof. The preparation method comprises the following steps: uniformly mixing polyol, diisocyanate and a catalyst, adding a chain extender with a structure represented by formula (I) or formula (II), and reacting to obtain the waterborne polyurethane. In the formula (I) or formula (II), R, R1, R2 and R3 are independently selected from an alkyl group, a substituted alkyl group, a phenyl group, a substituted phenyl group, heterocyclic group, an alkyl heterocyclic group or a carbonyl group. The waterbornepolyurethane is prepared by selecting a specific chain extender, and the chain extender contains a hydroxyl group with a cross-linking effect and a carboxyl group or a tertiary amino group with a hydrophilic effect at the same time, is in a liquid state at normal temperature and has the advantage of obvious compatibility; and when the chain extender is used for preparing polyurethane, the waterborne polyurethane emulsion can be endowed with good storage stability and high biological content (up to 90%), the mechanical property of the waterborne polyurethane is improved, and the waterborne polyurethane has the level equivalent to or superior to that of a waterborne polyurethane material prepared from a conventional commercial chain extender.

Description

Technical field[0001]The invention belongs to the field of polymer materials, and specifically relates to a water-based polyurethane and a preparation method and application thereof.Background technique[0002]Polyurethane (PU) is one of the most important polymers. Due to its excellent properties, it has been widely used in coatings, sealants, adhesives, foams and composite materials. At present, most of the hydrophilic chain extenders used in the preparation of polyurethane are dimethylolbutyric acid (DMBA), 2,2-dimethylolpropionic acid (DMPA) and so on. The solubility of these hydrophilic chain extenders in organic solvents is low, resulting in the use of a large amount of solvents when preparing PU, and the generated volatile organic compounds (VOC), including toluene, methyl ethyl ketone, etc., are extremely harmful to the environment and construction personnel. hurt. On the other hand, petrochemical resources are now facing exhaustion, leading to relatively large fluctuations in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/10C08G18/66C08G18/67C08G18/48C08G18/44C08G18/32C09D175/14C09D175/08C09D175/04C09J175/14C09J175/08C09J175/04C08L75/14C08L75/08C08L75/04C07C319/18C07C323/59C07C323/58C07D303/36
CPCC07C319/18C07D303/36C08G18/10C08G18/36C08G18/44C08G18/4825C08G18/6651C08G18/6685C08L75/04C08L75/08C08L75/14C08L2203/14C09D175/04C09D175/08C09D175/14C09J175/04C09J175/08C09J175/14C08G18/3868C07C323/59C07C323/58
Inventor 张超群王晓张怡卢其明罗颖
Owner SOUTH CHINA AGRI UNIV
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