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Cationic type aqueous polyurethane dispersoid and preparation method thereof

A water-based polyurethane and cationic technology, which is applied in the field of cationic water-based polyurethane dispersion and its preparation, can solve problems affecting the production, development and application of cationic water-based polyurethane, insufficient solvent resistance, product application restrictions, etc., and achieve good appearance , Excellent solvent resistance, reasonable ratio effect

Active Publication Date: 2014-10-08
CNOOC CHANGZHOU PAINT & COATINGS IND RES INST +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when cationic water-based polyurethane is applied to different substrates as a coating, it is generally required that the coating has a certain solvent resistance, and the cationic water-based polyurethane products currently on the market generally have solvent resistance (especially resistance to alcohol wiping) Insufficient problems have caused the existing products to be greatly restricted in application; in addition, the current synthesis process of cationic water-based polyurethane is to use diols containing tertiary amine groups for chain extension first to obtain tertiary amine-containing compounds in the main chain. Polyurethane prepolymer with NCO base and end group, use neutralizer to quaternize tertiary amino group, and then emulsify to obtain cationic waterborne polyurethane
Since the tertiary amine compound has a strong catalytic effect on the reaction of the NCO group and the OH group in the isocyanate and the self-polymerization reaction of the isocyanate itself, the preparation process is accompanied by many side reactions, and the viscosity of the system is relatively large in the later stage of the reaction, resulting in Difficult to emulsify, even lead to gel in severe cases
This affects the production, development and application of cationic waterborne polyurethane

Method used

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  • Cationic type aqueous polyurethane dispersoid and preparation method thereof
  • Cationic type aqueous polyurethane dispersoid and preparation method thereof
  • Cationic type aqueous polyurethane dispersoid and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Embodiment 1 concrete operation is as follows:

[0042] ① Prepare the raw materials according to the formula in Table 1;

[0043] ② Preparation of isocyanate-terminated polyurethane prepolymer solution

[0044] In a four-necked flask equipped with a stirrer, a thermometer and a condenser tube, mix the isocyanate prepared in step ①, polymer diol, small molecule chain extender, crosslinking agent, catalyst and 543 grams of solvent acetone, and heat at 90°C The reaction was carried out for 5 hours to obtain an isocyanate-terminated polyurethane prepolymer solution with a solid content of 50 wt%, which was stored for future use;

[0045] ③ Prepare the primer solution

[0046] The dihydroxyl compound containing the tertiary amino group prepared by step 1, the dihydroxyl compound containing aliphatic hydrocarbon group in the side chain are mixed with 119 grams of solvent acetone as the primer solution, and its solid content is 50wt%.

[0047] ④Preparation of cationic water...

Embodiment 2

[0049] Embodiment 2 concrete operations are as follows:

[0050] The preparation method is basically the same as in Example 1, the difference is: polycaprolactone diol is used as the polymer diol, and the specific formula is shown in Table 1; when step 2. prepares the isocyanate-terminated polyurethane prepolymer solution, the amount of solvent acetone 518 grams; step ④ when preparing the cationic water-based polyurethane dispersion, the viscosity of the obtained polyurethane prepolymer solution was 11171mPa·s, and during emulsification, the amount of deionized water was 1488 grams.

Embodiment 3

[0051] Embodiment 3 concrete operations are as follows:

[0052] The preparation method is basically the same as in Example 1, except that toluene diisocyanate is used as the isocyanate, and oleic acid diethanolamide is used as the dihydroxy compound containing aliphatic hydrocarbon groups in the side chain. The specific formula is shown in Table 1; step ② prepares isocyanate-terminated polyurethane During prepolymer solution, solvent acetone consumption is 495 grams; Step 3. when preparing primer solution, solvent acetone consumption is 118 grams; Step 4. when preparing cationic waterborne polyurethane dispersion, the viscosity of the polyurethane prepolymer solution that obtains is 16710mPa ·s, when emulsifying, the amount of deionized water is 1432 grams.

[0053] (2) The specific formula for preparing the comparative cationic waterborne polyurethane dispersion is shown in Table 2.

[0054] Table 2

[0055]

[0056]

[0057] Note: The grade of polytetrahydrofuran e...

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Abstract

The invention relates to a cationic type aqueous polyurethane dispersoid and a preparation method thereof. The preparation method of the cationic type aqueous polyurethane dispersoid comprises the following steps: dropwise adding a special isocyanate-terminated polyurethane prepolymer solution into a backing material solution which consists of a tertamide-containing dihydroxyl compound and a dihydroxyl compound with a side chain containing fatty hydrocarbyl, reacting and subsequently obtaining the polyurethane prepolymer solution; neutralizing and emulsifying the polyurethane prepolymer solution to obtain the cationic type aqueous polyurethane dispersoid, wherein a side chain of resin molecule has long-chain fatty hydrocarbyl; the use amount of the tertamide-containing dihydroxyl compound is 6-15wt%; the use amount of the dihydroxyl compound with side chain containing fatty hydrocarbyl is 8-20wt%; the polyurethane prepolymer solution is moderate in viscosity before neutralizing; the process is easy to control; the prepared cationic type aqueous polyurethane dispersoid is good in emulsion appearance, excellent in adhesion to the base material after forming film and more excellent in water resistance and solvent resistance after coating.

Description

technical field [0001] The invention relates to a cationic aqueous polyurethane dispersion and a preparation method thereof. Background technique [0002] Since the birth of water-based polyurethane, it has become one of the fastest-growing and most active branches of polyurethane due to its wide range of uses and environmental friendliness. Among them, cationic water-based polyurethane has cationic groups on its molecular skeleton. It can be used under acidic conditions, and has excellent chemical resistance, corrosion resistance, solvent resistance and good bonding performance. These characteristics make it suitable for application in the fields of metal material surface treatment liquid, leather, paint, adhesive, textile and paper making. However, when cationic water-based polyurethane is applied to different substrates as a coating, it is generally required that the coating has a certain solvent resistance, and the cationic water-based polyurethane products currently on...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/75C08G18/76C08G18/66C08G18/32C08G18/12C08G18/48C08G18/42C08J3/07
CPCC08G18/0814C08G18/12C08G18/664C08G18/6644C08G18/6674C08G18/6677C08G18/755C08G18/7614C08G18/3275C08G18/3819
Inventor 许飞胡中陈卫东张汉青朱柯祝宝英庄振宇凌晓飞
Owner CNOOC CHANGZHOU PAINT & COATINGS IND RES INST
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