A kind of waterborne polyurethane and its preparation method and application

A water-based polyurethane reaction technology, which is applied in the preparation of polyurea/polyurethane coatings, polyurea/polyurethane adhesives, sulfides, etc., can solve the problems of environmental protection and achieve obvious compatibility, high biological content, The effect of improving mechanical properties

Active Publication Date: 2021-07-09
SOUTH CHINA AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • A kind of waterborne polyurethane and its preparation method and application
  • A kind of waterborne polyurethane and its preparation method and application
  • A kind of waterborne polyurethane and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

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

[0097] First, appropriate proportions of NAC, CO and photoinitiator (4 wt.%) were dissolved in absolute ethanol and transferred into a quartz tube. Under the ultraviolet radiation of 350W power, react for a certain period of time (reaction equipment such as figure 1 ). Thereafter, the product was extracted with ethyl acetate, and dried over anhydrous magnesium sulfate. The product was filtered and rotovapped to remove ethyl acetate, then dried under vacuum at 45°C overnight 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 thiol / double bond molar ratios (1:1, 2:1) were selected for use. 1, 3:1, 4:1, 5:1 and 6:1), and the obtained chain extenders ar...

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 Structure of N-acetyl-L-cysteine ​​derivatives

[0124]

[0125] Castor Oil and N-Acetyl-L-Cysteine ​​Derivatives for Click Reaction

[0126] N-acetyl-L-cysteine ​​derivatives (derivatives 1-8), CO and photoinitiator (4 wt.%) were dissolved in absolute ethanol and transferred to a quartz tube. React for 15 minutes under ultraviolet irradiation with 350W power. Thereafter, the product was extracted with ethyl acetate, and dried over 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 chain extenders, which were recorded as Examples 2-9 in sequence, and their performance characteristics are shown in Tabl...

Embodiment 10

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

[0131] Such as Figure 6 , polyols (PPG, PCDL, CO, castor oil derivatives) and isophorone diisocyanate (IPDI) were added into a double-necked flask equipped with mechanical stirring, and stirred and mixed at a temperature of 78° C. for 10 min. Then, dibutyltin laurate (DBTDL) (1% mass fraction of polyol) was added into 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, and the dropwise addition was completed within 60 minutes. The consumption 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 was cooled to room temperature, the system was neut...

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Abstract

The present invention relates to a kind of water-based polyurethane and its preparation method and application, comprising the following steps: uniformly mixing polyol, diisocyanate and catalyst, adding a chain extender having the structure shown in formula (I) or formula (II), and reacting That is, the water-based polyurethane is obtained; wherein, R, R 1 , R 2 and R 3 independently selected from alkyl, substituted alkyl, phenyl, substituted phenyl, heterocyclyl, alkylheterocyclyl or carbonyl. The invention provides water-based polyurethane prepared by selecting a specific chain extender, the chain extender has both cross-linking hydroxyl groups and hydrophilic carboxyl groups or tertiary amino groups, and is liquid at normal temperature and has obvious compatibility Advantages; when using it to prepare polyurethane, it can give water-based polyurethane emulsion good storage stability, high biological content (up to 90%), and the mechanical properties of water-based polyurethane are improved, which is equivalent to or better than conventional commercial chain extender preparation Get the level of water-based polyurethane material.

Description

technical field [0001] The invention belongs to the field of polymer materials, and in particular relates to a water-based polyurethane and its preparation method and application. Background technique [0002] Polyurethane (PU) is one of the most important polymers and has been widely used in coatings, sealants, adhesives, foams and composites due to its excellent properties. At present, most of the hydrophilic chain extenders used in the preparation of polyurethane are dimethylolbutyric acid (DMBA), 2,2-dimethylolpropionic acid (DMPA) and the like. 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., have caused great harm to the environment and construction personnel. harm. On the other hand, petrochemical resources are now facing depletion, resulting in relatively large price fl...

Claims

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Application Information

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Patent Type & Authority Patents(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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