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Method for preparing hyperbranched unsaturated polyester resin

A polyester resin, unsaturated technology, applied in the field of preparation of unsaturated polyester resin, can solve the problems of high pollution, complicated process, poor curing, etc., and achieve the effect of improving mutual solubility, simplifying process, and small shrinkage

Active Publication Date: 2015-01-14
河北新盾合成材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The hyperbranched unsaturated polyester resins currently reported are all in the research stage. The synthesis steps of hydroxyl-terminated hyperbranched polyesters basically use expensive low-boiling point solvents, and the subsequent steps need to recover the solvent by distillation. The process is complicated and polluting. Large, and the dilute active monomer used in the prepared hyperbranched unsaturated polyester resin is not cheap and large amount of styrene, and the curability of the traditional redox curing system is poor

Method used

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  • Method for preparing hyperbranched unsaturated polyester resin
  • Method for preparing hyperbranched unsaturated polyester resin
  • Method for preparing hyperbranched unsaturated polyester resin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] This embodiment relates to a kind of preparation method of hyperbranched unsaturated polyester resin, and the specific operation steps of this method are as follows:

[0030] a. Add trimethylolpropane and dimethylolpropionic acid with a molar ratio of 1:3 into a four-neck flask, add an appropriate amount of solvent, slowly heat up to 100°C, start the stirrer, continue to heat up to 130°C, and the reaction is about 3h, measure the acid value of the system until there is little change; the reaction degree of the reaction system is reflected by the acid value, the greater the acid value, the lower the reaction degree, otherwise the higher the reaction degree;

[0031] b1. Add cyclic saturated acid anhydride and unsaturated acid, continue to keep warm at 130°C for about 3 hours, and measure the acid value until there is little change;

[0032] b2. Add a certain amount of aliphatic unsaturated acid anhydride, react at 140°C for about 1h, measure the acid value, cool down to ...

Embodiment 2

[0034] This example involves the preparation of several hyperbranched unsaturated polyester resins. According to the method of Example 1, different solvents, cyclic saturated acid anhydrides, aliphatic unsaturated acid anhydrides and unsaturated acids are selected for synthetic reactions, and the prepared The properties of different hyperbranched unsaturated polyester resins are shown in the table below:

[0035]

[0036] The synthetic reaction molecular formula of embodiment 2.1 is as follows:

[0037]

[0038] .

Embodiment 3

[0040]This example relates to a preparation method of hyperbranched unsaturated polyester resin, using DBP as a solvent, adding phthalic anhydride, maleic anhydride, and acrylic acid to carry out esterification reaction on hyperbranched polyester, by changing the amount of DBP added, the sequence of adding acrylic acid, The reaction temperature of each reaction step is compared with the performance of the hyperbranched unsaturated polyester resin prepared under different reaction conditions.

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Abstract

The invention relates to a method for preparing hyperbranched unsaturated polyester resin. The method comprises the following steps of a, synthesizing hyperbranched polyester with a terminal hydroxy group at a tail end through trimethylolpropane and dimethylolpropionic acid in a phthalate plasticizing agent as a solvent; b, adding cyclic saturated anhydride, aliphatic unsaturated anhydride and unsaturated acid to the hyperbranched polyester with the terminal hydroxy group as the tail end, which is obtained from the step a, to synthesize the hyperbranched unsaturated polyester resin. The obtained hyperbranched unsaturated polyester resin is diluted by using styrene and solidified by using the traditional oxidation-reduction solidifying system; the hyperbranched unsaturated polyester resin has the advantages of less contractility and the like, and is difficult to deform after being solidified and formed. According to the method, the phthalate plasticizing agent is taken as the solvent of a synthesis process in the preparation process of the hyperbranched polyester with the terminal hydroxy group at the tail end and finally substitutes for an expensive low-boiling solvent used for the traditional synthesis process as the plasticizing agent, so that the recovery step of the solvent is omitted, the VOC is reduced, and the process is simplified, economic and environmental friendly.

Description

technical field [0001] The invention relates to a preparation method of unsaturated polyester resin, in particular to a preparation method of hyperbranched unsaturated polyester resin. Background technique [0002] Unsaturated polyester resin (UPR) is the most commonly used type of thermosetting resin. Due to its simple production process and easy availability of raw materials, it also has excellent chemical corrosion resistance, mechanical properties, and electrical properties. The most important thing is that it can be cured at room temperature and pressure. Good process performance, so it is widely used in FRP composite products such as structure, anti-corrosion, insulation, etc. With the wide application of UPR in construction, coating, aerospace and other fields, people's requirements for UPR performance are getting higher and higher. The biggest disadvantage of UPR is that the shrinkage rate is relatively large during the curing process, which easily affects product qu...

Claims

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Application Information

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IPC IPC(8): C08G63/91C08G63/06C08G63/81
Inventor 刘方方冯倩男张林雅
Owner 河北新盾合成材料有限公司