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Preparation method of carrier resin for unsaturated polyester resin color paste
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A polyester resin and carrier resin technology, applied in the direction of pigment paste, etc., can solve the problems of easy delamination, insufficient flexibility, and many volatiles, and achieve the effects of good stability, good flexibility, and less volatiles
Active Publication Date: 2016-06-01
CHANGZHOU TIANMA GROUP CO LTD
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Problems solved by technology
Monomers often have the following disadvantages: first, the price is high; second, the prepared color paste has poor stability and is easy to delaminate; third, when used, it has poor compatibility with unsaturated polyester resin and affects the quality of the finished product. intensity; four is a certain smell
Low-reactivity unsaturated polyester often has the following disadvantages: first, it affects the performance of unsaturated polyester resin, especially the strength and aging performance; The environment is harmful; the third is that the flexibility is not enough; the fourth is to affect the strength of the product to a certain extent
However, there are many small molecules in the carrier resin produced by this method, so that the volatile matter of the carrier resin is more. In addition, when the carrier resin is used as a color paste, the small molecules may react with the unsaturated polyester resin, reducing the amount of unsaturated polyester resin. Strength of
Method used
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Embodiment 1）
[0016] The preparation method of the carrier resin for the unsaturated polyester resin color paste of the present embodiment comprises the following steps:
[0017] ①Add 930g of dipropylene glycol, 600g of adipic acid, and 185g of maleic anhydride into the reactor, feed nitrogen into the reactor and stir evenly; after stirring well, gradually raise the temperature so that the temperature in the reactor is 210°C. Condensation reaction was carried out in the reactor at this temperature and under the protection of nitrogen; after the reaction system became uniform and transparent, the reaction was continued at 210°C until the acid value of the reaction product was measured to be less than 20mgKOH / g.
[0018] ②Reduce the temperature of the product obtained in step ① to 180°C-190°C, then add 60g of hydroquinone to the product, stir evenly, cool the material to below 40°C, and filter to obtain the carrier resin for unsaturated polyester resin color paste . When the material is cool...
Embodiment 2）
[0022] The rest of the preparation method of the carrier resin for the unsaturated polyester resin color paste of the present embodiment is the same as that of Example 1, the difference is that: in step ①, add 930 g of dipropylene glycol, 830 g of sebacic acid, and Alkenic anhydride 185g.
[0023] In step ①, the temperature in the reactor rises to 210° C., and the condensation reaction is carried out in the reactor at this temperature and under the protection of nitrogen.
[0024] The carrier resin prepared in this example is a light yellow transparent liquid with a viscosity (25°C, mPa.S) of 5.10 and an acid value mgKOH / g of 15.9. The molecular weight is 2100-2600.
Embodiment 3）
[0026] The rest of the preparation method of the carrier resin for the unsaturated polyester resin color paste of the present embodiment is the same as that of Example 1, the difference is that in step ①, 735 g of diethylene glycol, 600 g of adipic acid, and 600 g of adipic acid are added to the reactor. Maleic anhydride 185g.
[0027] In step ①, the temperature in the reactor rises to 210° C., and the condensation reaction is carried out in the reactor at this temperature and under the protection of nitrogen.
[0028] The carrier resin prepared in this example is a light yellow transparent liquid with a viscosity (25°C, mPa.S) of 4.60 and an acid value mgKOH / g of 16.8. The molecular weight is 1800-2300.
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Abstract
The invention discloses a method for preparing carrier resin for unsaturated polyester resin mill base. The method comprises the following steps: adding 70-95 parts of dihydric alcohol, 60-85 parts of binary acid, and 18-20 parts of maleic anhydride into a reactor, inletting nitrogen into the reactor and mixing uniformly; gradually heating up the reactor till the temperature in the reactor is 200-220DEG C, and carrying out condensation reaction at the temperature; after the reacting system becomes uniform and transparent, carrying out heat preservation and continuing the reaction till the measured acid value of the reaction product is less than 20mgKOH / g, wherein the dihydric alcohol is diethylene glycol or dipropylene glycol, and polyatomic acid is adipic acid or sebacic acid; cooling the product obtained in the reaction to 180-190DEG C, then adding 5-6 parts of hydroquinone into the product, mixing uniformly and cooling the material to below 40DEG C, and filtering so as to obtain the carrier resin for the unsaturated polyester resin mill base. The prepared unsaturated polyester is in a good liquid state, and is applicable to the mill base, and the prepared mill base has good stability.
Description
technical field [0001] The invention relates to a method for preparing a resin, in particular to a method for preparing a carrier resin for an unsaturated polyester resin color paste. Background technique [0002] Unsaturated polyester resin color paste is made by dispersing and grinding pigments and additives in a proprietary carrier, which can be used for coloring unsaturated polyester resin FRP products; when used, the color paste and unsaturated The polyester resin is evenly mixed, and after molding, the product with the desired color is obtained, and the specific color can be prepared according to requirements. [0003] Only when the color paste has good coloring properties can the effect of the pigment be brought into full play, so that for the same color and color strength, the amount of color paste is the least and the hiding power is the strongest. At the same time, the high-performance color paste has a complete quality requirement system in terms of quality, has ...
Claims
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Application Information
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