Preparation method of terephthalic acid type UPR (unsaturated polyester resin)

A technology of terephthalic acid and polyester resin, applied in the field of preparation of unsaturated polyester resin, can solve the problems of poor wettability, limit the use range of unsaturated polyester resin, etc., and achieve good wettability and good chemical resistance. Effect

Active Publication Date: 2019-06-21
NEW SOLAR TECH GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the unsaturated polyester resins commonly used in chemical enterprises have slightly inferior wettability to glass fi

Method used

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  • Preparation method of terephthalic acid type UPR (unsaturated polyester resin)
  • Preparation method of terephthalic acid type UPR (unsaturated polyester resin)
  • Preparation method of terephthalic acid type UPR (unsaturated polyester resin)

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A kind of preparation method of terephthalic acid type unsaturated polyester resin, comprises the following steps:

[0025] (1) Prepare raw materials according to the following mass percentages:

[0026]

[0027] (2) Under the protection of nitrogen, add maleic anhydride and water into the reaction kettle, raise the temperature to 110°C and stir until the maleic anhydride is completely dissolved, add dicyclopentadiene dropwise, after the dropwise addition, heat up To 130°C, react for 2h;

[0028] (3) In another reaction kettle, add terephthalic acid, propylene glycol and a catalyst, heat up to 220°C, and react until the acid value is lower than 5mgKOH / g;

[0029] The catalyst uses tungsten hexachloride as the main catalyst and the reducing aluminum compound as the co-catalyst. The tungsten hexachloride is modified to introduce oxygen ligands and phenolic ligands to form a complex WOCl 4-x (OAr) X .

[0030] By reacting with water in the emulsion, oxygen ligands a...

Embodiment 2

[0049] A kind of preparation method of terephthalic acid type unsaturated polyester resin, comprises the following steps:

[0050] (1) Prepare raw materials according to the following mass percentages:

[0051]

[0052]

[0053] (2) Under the protection of nitrogen, add maleic anhydride and water into the reaction kettle, raise the temperature to 120°C and stir until the maleic anhydride is completely dissolved, add dicyclopentadiene dropwise, after the dropwise addition, heat up To 140°C, react for 3h;

[0054] (3) In another reaction kettle, add terephthalic acid, propylene glycol and a catalyst, heat up to 230°C, and react until the acid value is lower than 5mgKOH / g;

[0055]The catalyst uses tungsten hexachloride as the main catalyst and the reducing aluminum compound as the co-catalyst. The tungsten hexachloride is modified to introduce oxygen ligands and phenolic ligands to form a complex WOCl 4-x (OAr) X .

[0056] By reacting with water in the emulsion, oxyge...

Embodiment 3

[0065] A kind of preparation method of terephthalic acid type unsaturated polyester resin, comprises the following steps:

[0066] (1) Prepare raw materials according to the following mass percentages:

[0067]

[0068] (2) Under the protection of nitrogen, add maleic anhydride and water into the reaction kettle, raise the temperature to 115°C and stir until the maleic anhydride is completely dissolved, add dicyclopentadiene dropwise, after the dropwise addition, heat up To 135°C, react for 2.5h;

[0069] (3) In another reaction kettle, add terephthalic acid, propylene glycol and a catalyst, heat up to 225°C, and react until the acid value is lower than 5mgKOH / g;

[0070] The catalyst uses tungsten hexachloride as the main catalyst and the reducing aluminum compound as the co-catalyst. The tungsten hexachloride is modified to introduce oxygen ligands and phenolic ligands to form a complex WOCl 4-x (OAr) X .

[0071] By reacting with water in the emulsion, oxygen ligands...

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Abstract

The invention relates to a preparation method of terephthalic acid type UPR (unsaturated polyester resin). The preparation method comprises following steps: (1), dosing is performed: 10%-15% of dicyclopentadiene, 5% of water, 20%-25% of maleic anhydride, 10%-15% of terephthalic acid, 10%-15% of propanediol, 10%-15% of diethylene glycol and 1%-5% of hydroquinone are prepared; (2), after maleic anhydride and water are mixed uniformly, dicyclopentadiene is added, and a mixture is heated and subjected to a reaction for 2-3 h; (3), terephthalic acid, propanediol and the catalyst are added to another reaction kettle, and a mixture is heated and subjected to a reaction until an acid value is lower than 5 mgKOH/g; (4), after the two reaction products are mixed and diethylene glycol is added, a mixture is heated and subjected to a reaction until the acid value is lower than 17 mgKOH/g. The prepared UPR has good wettability with glass fiber and has better chemical resistance; the resin is applicable to S/F double walled tank resin, and a casting body of the resin can be used as an S/F double walled oil tank.

Description

technical field [0001] The invention relates to a preparation method of unsaturated polyester resin, in particular to a preparation method of terephthalic acid type unsaturated polyester resin and its application. Background technique [0002] Unsaturated polyester resins are widely used in industries such as industry, agriculture, national defense and construction, especially glass fiber reinforced unsaturated polyester, which has developed rapidly due to its high strength and convenient processing. At present, the consumption of polyester in polyester FRP has accounted for 70%-80% of the total consumption of polyester. Unsaturated polyester resins are generally polyester polymers with unsaturated bonds in the molecular chain, which are formed by polycondensation of unsaturated dibasic acids (anhydrides), saturated dibasic acids (anhydrides) and dibasic alcohols or polyols, and After the polycondensation reaction is over, add a certain amount of vinyl monomer while it is h...

Claims

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Application Information

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IPC IPC(8): C08L67/06C08K7/14C08G63/676C08F222/06C08F232/08C08G63/183C08G63/84
Inventor 李志明罗良胜陈军张叶飞肖进龚晓波唐崑
Owner NEW SOLAR TECH GRP CO LTD
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