Liquid carboxy-containing polyester oligomer, water-compatible polyurethane resin, and process for producing the same
A water-based polyurethane, carboxyl-containing technology, applied in the direction of polyurea/polyurethane coatings, coatings, etc., can solve the problems of unmentioned, unmentioned, poor solubility, etc.
Inactive Publication Date: 2005-10-05
DAICEL CHEM IND LTD
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- Abstract
- Description
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- Application Information
AI Technical Summary
Problems solved by technology
[0004] However, this method has the following problems: when the urethane prepolymer is obtained, the solubility of dimethylolpropionic acid in polyisocyanate compounds, polyols, and generally low-boiling organic solvents such as acetone and methyl ethyl ketone is poor, If the reaction is carried out in a solvent-free or low-boiling point organic solvent, the reaction system will become inhomogeneous and a gelatinous substance will easily be formed
However, in the description of the patent document, as an example, only the addition of dimethylolpropionic acid and caprolactone is described, and the formula (1) HOCH involved in the present invention is never mentioned. 2 C(COOH)RCH 2 OH (where R is C 2 The adduct of dimethylolalkanoic acid and ε-caprolactone represented by the above alkyl)
Moreover, it is not mentioned that by studying in detail the addition of dimethylol alkanoic acid and caprolactone shown in the above formula (1), it is possible to generate carboxyl-containing polyester polyols that are liquid at room temperature within a certain molecular weight range.
Method used
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Experimental program
Comparison scheme
Effect test
Embodiment 1
[0034] In reactor, load 148 parts of dimethylolbutyric acid, 452 parts of epsilon-caprolactone, and load catalyst stannous octoate, make its concentration reach 5ppm, heat while stirring under nitrogen flow, after evenly dissolving, in React at 90° C. for 4 hours to obtain a carboxyl-containing polyester polyol with a number average molecular weight of 600. Let this be polyol A.
Embodiment 2
[0036] In the reactor, 148 parts of dimethylolbutyric acid, 552 parts of epsilon-caprolactone are loaded, and the catalyst stannous octoate is loaded into, so that its concentration reaches 5 ppm, and the same operation as in Example 1 obtains that the number average molecular weight is 700 Carboxyl-containing polyester polyols. Let this be polyol B.
Embodiment 3
[0038] In the reactor, 148 parts of dimethylolbutyric acid, 652 parts of epsilon-caprolactone are loaded, and the catalyst stannous octoate is loaded into, so that its concentration reaches 5 ppm, and the same operation as in Example 1 obtains that the number average molecular weight is 800 Carboxyl-containing polyester polyols. Let this be polyol C.
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Abstract
A carboxy-containing polyester polyol which is obtained by polymerizing epsilon -caprolactone by ring-opening polymerization with a compound represented by the formula (1): HOCH2C (COOH) RCH2OH (wherein R is C2 or higher alkyl) and which has a number-average molecular weight of 550 to 950 and is liquid at ordinary temperature. This polyol can give a water-compatible polyurethane resin which is excellent in the preservation of a working atmosphere during handling and application and has excellent drying properties after application, and which has homogeneity and excellent stability and is useful in a wide range of applications such as a binder for coating materials, printing inks, etc. and an adhesive. By the production process, a water-compatible polyurethane resin which is excellent in the preservation of a working atmosphere and drying property and is homogeneous and stable can be easily produced.
Description
technical field [0001] The invention relates to water-based polyurethane resin and a preparation method thereof. Specifically, it relates to a water-based polyurethane resin and a preparation method thereof that can be used for coatings, adhesives, adhesives and the like. Background technique [0002] Water-based polyurethane resin has been used for coatings, adhesives, adhesives, etc. due to its excellent flexibility, mechanical properties, and adhesive properties. Recently, the discharge of organic solvents to the atmosphere has been restricted due to environmental improvement. Therefore, the development and utilization of waterborne polyurethane resins are in progress. [0003] So far, people have made many attempts to introduce hydrophilic groups into polyurethane resins to make them water-based. Among them, anionic resins formed by introducing carboxylate groups into polyurethane chains have good water resistance. Get lots of research. Its preparation method is mainl...
Claims
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IPC IPC(8): C08G18/08C08G18/42C08G63/08C09D175/06
CPCC09D175/06C08G18/0823C08G18/4277C08G63/08C08G18/4263C08G18/28C08G18/08C08G18/36
Inventor 远藤敏朗大谷喜作
Owner DAICEL CHEM IND LTD