阅读说明：本技术 一种饱和聚酯树脂及制备方法 (Saturated polyester resin and preparation method thereof ) 是由 李烈栋 张良务 于 2019-11-19 设计创作，主要内容包括：本发明公开了一种饱和聚酯树脂及制备方法,饱和聚酯树脂组份按重量份数包括E-12环氧树脂20-40份、2-乙基-丁基丙二醇10-20份、三羟甲基丙烷5-12份、间苯二甲酸4-10份、偏苯三酸酐3-9份、二甲基乙醇胺5-15份、抗氧化剂1-3份、抗冻剂1-3份,本发明采用的制备方法操作简单,制得的聚酯树脂耐候性和柔韧性好,能够有效的改善漆膜性能,延长了漆膜的使用寿命。(The invention discloses a saturated polyester resin and a preparation method thereof, wherein the saturated polyester resin comprises, by weight, 20-40 parts of E-12 epoxy resin, 10-20 parts of 2-ethyl-butyl propylene glycol, 5-12 parts of trimethylolpropane, 4-10 parts of isophthalic acid, 3-9 parts of trimellitic anhydride, 5-15 parts of dimethylethanolamine, 1-3 parts of an antioxidant and 1-3 parts of an antifreeze agent.)

1. A saturated polyester resin characterized by: the saturated polyester resin component comprises, by weight, 20-40 parts of E-12 epoxy resin, 10-20 parts of 2-ethyl-butyl propylene glycol, 5-12 parts of trimethylolpropane, 4-10 parts of isophthalic acid, 3-9 parts of trimellitic anhydride, 5-15 parts of dimethylethanolamine, 1-3 parts of an antioxidant and 1-3 parts of an antifreeze agent.

2. A saturated polyester resin according to claim 1, wherein: the preferable component proportion of the saturated polyester resin component comprises 30 parts of E-12 epoxy resin, 15 parts of 2-ethyl-butyl propylene glycol, 9 parts of trimethylolpropane, 7 parts of isophthalic acid, 6 parts of trimellitic anhydride, 10 parts of dimethylethanolamine, 2 parts of antioxidant and 2 parts of antifreeze agent.

3. A saturated polyester resin according to claim 1, wherein: the antioxidant consists of 30% of ethoxyquinoline, 20% of gluconic acid, 20% of boron oxide, 20% of glass powder and 10% of sodium tripolyphosphate.

4. A saturated polyester resin according to claim 1, wherein: the antifreeze agent consists of 30 percent of potassium carbonate, 30 percent of calcium chloride, 20 percent of sodium carboxymethyl cellulose and 20 percent of graphite powder.

5. The preparation method for realizing the saturated polyester resin of claim 1 is characterized by comprising the following steps: the preparation method comprises the following steps:

A. mixing E-12 epoxy resin, 2-ethyl-butyl propylene glycol, trimethylolpropane, isophthalic acid and trimellitic anhydride, adding the mixture into a reaction kettle for esterification, introducing nitrogen into the reaction kettle, controlling the temperature of a distillation head to be 101-180 ℃, quickly heating to 170-180 ℃ after reacting for 2-3h, preserving heat for 1-2h, heating to 220-230 ℃, and keeping the temperature for 1-2h to obtain a mixture A;

B. adding dimethylethanolamine, an antioxidant and an antifreeze into the mixture A, fully mixing, adding into a stirring tank, and stirring at a low speed of 80-120 rpm for 15-25 min to obtain a mixture B;

C. and (3) placing the mixture B in a vacuum furnace, keeping the vacuum degree at-0.09 to-0.1 MPa, heating the vacuum furnace to 180 ℃ and 200 ℃, and maintaining for 40min to 60min to obtain the saturated polyester resin.

6. The method for preparing a saturated polyester resin according to claim 5, wherein: in the step A, the nitrogen gas is introduced at a flow rate of 2-3L/min for 50-60 min.

Technical Field

The invention relates to the technical field of saturated polyester resin preparation, in particular to a saturated polyester resin and a preparation method thereof.

Background

Saturated polyester resins are usually used in stoving systems with a combination of methylated amino resins, and are required to have good hardness, flexibility, processability and weathering resistance. In recent years, with the enhancement of environmental awareness and national control of coating VOC (volatile organic compounds), the trend of saturated polyester water is one trend. At present, most of polyester resins for outdoor coil coatings generally have poor weather resistance, and the service performance of the coatings is influenced.

Disclosure of Invention

The present invention aims to provide a saturated polyester resin and a preparation method thereof, so as to solve the problems in the background technology.

In order to achieve the purpose, the invention provides the following technical scheme: the saturated polyester resin comprises, by weight, 20-40 parts of E-12 epoxy resin, 10-20 parts of 2-ethyl-butyl propylene glycol, 5-12 parts of trimethylolpropane, 4-10 parts of isophthalic acid, 3-9 parts of trimellitic anhydride, 5-15 parts of dimethylethanolamine, 1-3 parts of an antioxidant and 1-3 parts of an antifreeze agent.

Preferably, the saturated polyester resin component preferably comprises 30 parts of E-12 epoxy resin, 15 parts of 2-ethyl-butyl propylene glycol, 9 parts of trimethylolpropane, 7 parts of isophthalic acid, 6 parts of trimellitic anhydride, 10 parts of dimethylethanolamine, 2 parts of an antioxidant and 2 parts of an antifreeze agent.

Preferably, the antioxidant consists of 30% of ethoxyquinoline, 20% of gluconic acid, 20% of boron oxide, 20% of glass powder and 10% of sodium tripolyphosphate.

Preferably, the antifreeze agent consists of 30% of potassium carbonate, 30% of calcium chloride, 20% of sodium carboxymethyl cellulose and 20% of graphite powder.

Preferably, the preparation method comprises the following steps:

A. mixing E-12 epoxy resin, 2-ethyl-butyl propylene glycol, trimethylolpropane, isophthalic acid and trimellitic anhydride, adding the mixture into a reaction kettle for esterification, introducing nitrogen into the reaction kettle, controlling the temperature of a distillation head to be 101-180 ℃, quickly heating to 170-180 ℃ after reacting for 2-3h, preserving heat for 1-2h, heating to 220-230 ℃, and keeping the temperature for 1-2h to obtain a mixture A;

B. adding dimethylethanolamine, an antioxidant and an antifreeze into the mixture A, fully mixing, adding into a stirring tank, and stirring at a low speed of 80-120 rpm for 15-25 min to obtain a mixture B;

C. and (3) placing the mixture B in a vacuum furnace, keeping the vacuum degree at-0.09 to-0.1 MPa, heating the vacuum furnace to 180 ℃ and 200 ℃, and maintaining for 40min to 60min to obtain the saturated polyester resin.

Preferably, the flow rate of nitrogen gas introduced in the step A is 2-3L/min, and the introduction time is 50-60 min.

Compared with the prior art, the invention has the beneficial effects that: the preparation method adopted by the invention is simple to operate, and the prepared polyester resin has good weather resistance and flexibility, can effectively improve the performance of a paint film, and prolongs the service life of the paint film; the antioxidant added in the invention has good oxidation resistance, and can effectively prevent the polyester resin from being oxidized in the preparation process; the added antifreeze agent has the performance of freezing prevention and low temperature resistance, effectively ensures the frost resistance and crack resistance of the polyester resin, and ensures the use performance of the polyester resin at low temperature.

Detailed Description

The technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The invention provides the following technical scheme: a saturated polyester resin comprises, by weight, 20-40 parts of E-12 epoxy resin, 10-20 parts of 2-ethyl-butyl propylene glycol, 5-12 parts of trimethylolpropane, 4-10 parts of isophthalic acid, 3-9 parts of trimellitic anhydride, 5-15 parts of dimethylethanolamine, 1-3 parts of an antioxidant and 1-3 parts of an antifreeze agent; wherein the antioxidant consists of 30 percent of ethoxyquinoline, 20 percent of gluconic acid, 20 percent of boron oxide, 20 percent of glass powder and 10 percent of sodium tripolyphosphate; the antifreeze agent consists of 30 percent of potassium carbonate, 30 percent of calcium chloride, 20 percent of sodium carboxymethyl cellulose and 20 percent of graphite powder.