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A kind of low molecular weight polyester polymer, preparation method and application thereof

A low-molecular-weight, polymer-based technology, applied in polyester coatings, coatings, primers, etc., can solve problems such as low hardness and poor flexibility

Active Publication Date: 2021-09-17
NIPPON PAINT IND COATINGS SHANGHAI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, hardness and flexibility are a pair of balance. The coating film with too good flexibility has low hardness; the coating film with high hardness has poor flexibility.

Method used

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  • A kind of low molecular weight polyester polymer, preparation method and application thereof
  • A kind of low molecular weight polyester polymer, preparation method and application thereof
  • A kind of low molecular weight polyester polymer, preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0073] 1. The formula of the low molecular weight polyester polymer of this embodiment is shown in Table 1:

[0074] Table 1

[0075] serial number name Specification Weight (parts) A 2-Methyl-1,3-propanediol Industrial products 162.2 B 1,6-Hexanediol Industrial products 141.8 C Trimethylolpropane Industrial products 13.4 D isophthalic acid Industrial products 70.0 E terephthalic acid Industrial products 63.0 F 1,6-Adipic acid Industrial products 233.8 G Phthalic anhydride Industrial products 59.2 H Tin Monobutyl Triisooctoate Industrial products 0.10 I Xylene Industrial products 30.0 J Butyl acetate Industrial products 190.0

[0076] 2. The preparation method of the low molecular weight polyester polymer of the present embodiment comprises the following steps:

[0077] To a three-necked flask equipped with a stirrer, a condenser and a thermometer, add A-G, heat up to 1...

Embodiment 2

[0097] 1. The formula of the low molecular weight polyester polymer of the present embodiment is shown in Table 5:

[0098] table 5

[0099]

[0100]

[0101] 2. The preparation method of the low molecular weight polyester polymer of the present embodiment comprises the following steps:

[0102] In a three-necked flask equipped with a stirrer, a condenser and a thermometer, add A-G, heat up to 120°C under nitrogen protection, add H and heat up to 160°C to produce esterified water, start the timing reaction, and heat up to 220°C in 7h, Then keep at 220°C for 4h, add I, continue to keep at 220°C for 2~4h, the reaction end point control test acid value=5.0~7.0mgKOH / g solid resin is qualified, after passing the temperature, it is cooled to 140°C for 3h, and J is added to obtain a transparent The clear low molecular weight polyester polymer has a number average molecular weight of Mn=2800, a weight average molecular weight of Mw=6900, a molecular weight distribution coeffici...

Embodiment 3

[0104] 1. The formula of the low molecular weight polyester polymer of this embodiment is shown in Table 6:

[0105] Table 6

[0106]

[0107]

[0108] 2. The preparation method of the low molecular weight polyester polymer of the present embodiment comprises the following steps:

[0109] In a three-necked flask equipped with a stirrer, a condenser and a thermometer, add A-G, heat up to 120°C under nitrogen protection, add H and heat up to 160°C to produce esterified water, start the timing reaction, and heat up to 220°C in 7h, Then keep at 220°C for 4h, add I, continue to keep at 220°C for 2~4h, the reaction end point control test acid value=9.5~11.5mgKOH / g solid resin is qualified, after passing the temperature, it is cooled to 140°C for 3h, and J is added to obtain a transparent A clear low molecular weight polyester polymer with a number average molecular weight of Mn=2600, a weight average molecular weight of Mw=6000, a molecular weight distribution coefficient of ...

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Abstract

The invention discloses a low-molecular-weight polyester polymer, the structure of which is shown in the general formula I: wherein: A is at least one of diols, triols, and tetraols with one hydroxyl group removed; B It is at least one of aryl, substituted aryl, alkyl, and substituted alkyl; n is a positive integer. Coating with the building material coil primer prepared by the low molecular weight polyester polymer solution of the present invention has the advantages of good processability, high hardness, high gloss, good adhesion, good weather resistance, good chemical resistance, good water resistance, etc. advantage.

Description

technical field [0001] The invention belongs to the technical field of coatings, and in particular relates to a low molecular weight polyester polymer, a preparation method and an application thereof. Background technique [0002] Pre-coated coils are organic material / metal clad steels sold in coils or single sheets after the coiled metal sheets are coated with paint. Users can directly process it into various products or components without coating, which greatly simplifies the overall production process of sheet metal products. The substrate is generally a metal substrate with a thickness of 0.2 to 2.0mm, and the maximum thickness can reach 2cm. [0003] The pre-coated coil coating must meet the characteristics of the production process and processing and use of the pre-coated coil; the production process adopts rapid roller coating construction. During roller coating, the speed of the paint roller and the substrate is different, and the speed between the rollers is also d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G63/20C09D167/00C09D161/20C09D7/61
CPCC08G63/20C08K2003/3045C09D5/002C09D167/00C09D7/61C08L61/20C08K3/346C08K3/30
Inventor 许帆捷施珠容唐晓冬王红伟
Owner NIPPON PAINT IND COATINGS SHANGHAI
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