Low-viscosity star-shaped hydroxyl polyester as well as preparation method and application thereof

A hydroxyl polyester, low-viscosity technology, applied in the field of organic polymer compounds, can solve problems such as complicated operation, long time consumption, and non-compliance with environmental protection requirements

CN105820048AActive Publication Date: 2016-08-03SOUTH CHINA UNIV OF TECH +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2016-08-03

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Abstract

The invention discloses low-viscosity star-shaped hydroxyl polyester as well as a preparation method and application thereof, and belongs to the field of macromolecules of polyester. According to the preparation method, a caprolactone modified AB2 type branched monomer is first prepared, and is prepared by a reaction between 1 mole of dihydroxymethyl alkyl carboxylic acid and 1-4 moles of caprolactone at 80-160 DEG C, afterwards, a polybasic glycidyl ether nucleus, monocarboxylic acid and the caprolactone modified AB2 type branched monomer are mixed and subjected to reaction at 100-160 DEG C, and a ring cleavage reaction between a carboxyl group and an epoxy group is catalyzed by utilizing a quaternary ammonium salt as a catalyst to generate a secondary carbonyl group for preparing the low-viscosity star-shaped hydroxyl polyester. The low-viscosity star-shaped hydroxyl polyester provided by the invention has the advantages that a synthetic process is simple, the adjustable range of the hydroxyl value of a product is large, the viscosity is low, and the like; the low-viscosity star-shaped hydroxyl polyester has the hydroxyl value between 1500mgKOH / g and 350mgKOH / g, has the viscosity as low as 3000-15000cp below 25 DEG C, and can be cross-linked with a polyurethane curing agent containing an isocyanate group; high-solid-content paint can be prepared, and the film coating performance meets a national standard for solvent type bi-component polyurethane paint for woodenware.
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Description

technical field

[0001] The present invention relates to a star-shaped hydroxyl polyester, in particular to a kind of multi-glycidyl ether as the core molecule, caprolactone modified AB 2 The invention relates to a method for synthesizing a star-shaped hydroxyl polyester by reacting a type-branched monomer and a monocarboxylic acid, and the application of the star-shaped hydroxyl polyester in high-solid coatings, belonging to the field of organic macromolecule compounds. technical background

[0002] High-solid coatings and solvent-free coatings are one of the development directions of the coatings industry. High-solid (solvent-free) two-component polyurethane coatings are particularly eye-catching because of their excellent performance. The development of low-viscosity, high-performance hydroxyl resins is the key to reducing the VOC of coatings and preparing high-solid (solvent-free) two-component polyurethane coatings. Hyperbranched polymers and star polymers have excellen...

Examples

Embodiment 1

[0056] 1. Raw material composition

[0057]

[0058] 2. Preparation

[0059] The synthesis principle of star-shaped hydroxyl polyester SHP-1 is as follows: Picture 1-1 As shown, it specifically includes the following steps:

[0060] (a) Caprolactone modified AB 2 Type branched monomer: In a four-necked flask equipped with a mechanical stirrer, a thermometer, a spherical condenser, and a nitrogen port, add 134.1g dimethylolpropionic acid, 228.3g caprolactone, and 1.0g anhydrous zinc acetate , reacted at 100°C for 6 hours under the protection of nitrogen, the infrared characteristic peak of caprolactone in the reaction system detected by infrared spectroscopy disappeared, and the solid content of the detected reaction system was >99%, and the AB modified by caprolactone was obtained by cooling down. 2 type branched monomer.

[0061] (b) Preparation of low-viscosity star-shaped hydroxyl polyester: modified AB prepared in step (a) 2 Add 422.5g trimethylolpropane triglycidy...

Embodiment 2

[0072] 1. Raw material composition

[0073]

[0074] 2. Preparation

[0075] The synthesis principle of star-shaped hydroxyl polyester SHP-2 is as follows: figure 2 As shown, it specifically includes the following steps:

[0076] (a) Caprolactone modified AB 2 Preparation of type branched monomer: In a four-necked flask equipped with a mechanical stirrer, a thermometer, a spherical condenser, and a nitrogen port, add 134.1g dimethylolpropionic acid, 114.1g caprolactone, and 0.25g dilaurel Dibutyltin acid, reacted at 140°C for 5 hours under the protection of nitrogen, the infrared characteristic peak of caprolactone in the reaction system detected by infrared spectroscopy disappeared, and the solid content of the detected reaction system was >99%, and the AB modified by caprolactone was obtained by cooling down. 2 type branched monomer.

[0077] (b) Preparation of low-viscosity star-shaped hydroxyl polyester: add 422.5g trimethylolpropane triglycidyl ether, 565.0g oleic...

Embodiment 3

[0084] 1. Raw material composition

[0085]

[0086] 2. Preparation

[0087] The synthesis principle of star-shaped hydroxyl polyester SHP-3 is as follows: image 3 As shown, it specifically includes the following steps:

[0088] (a) Caprolactone modified AB 2 Preparation of type branched monomer: In a four-necked flask equipped with a mechanical stirrer, a thermometer, a spherical condenser, and a nitrogen port, add 134.1g dimethylolpropionic acid, 456.6g caprolactone, 1.6g anhydrous Zinc acetate was reacted at 120°C for 6 hours under the protection of nitrogen. The infrared characteristic peak of caprolactone in the reaction system detected by infrared spectroscopy disappeared, and the solid content of the reaction system was detected to be >99%. The AB modified by caprolactone was obtained by cooling down. 2 type branched monomer.

[0089] (b) Preparation of low-viscosity star-shaped hydroxyl polyester: add 250g resorcinol diglycidyl ether, 282.5g oleic acid, 1.6g te...