Method for preparing solid epoxy resin toughened polyester

Abstract

The invention discloses a method for preparing solid epoxy resin toughened polyester. The method comprises the following steps: weighing, mixing, heating and stirring a terephthalic acid and polyol mixture and an esterification catalyst, performing esterification reaction at 175-185 DEG C, heating to 250-260 DEG C for 3.5-4.5 hours, draining the produced water, adding a defoaming agent into the mixture, controlling the vacuum degree to be less than -0.08MPa, vacuumizing for 3-5 hours, cooling, and discharging, thus obtaining a product, wherein the polyol mixture is a mixture of alkylene glycol and an organic waste liquid, and the organic waste liquid is a polyhydroxy organic compound recovered after a saturated salt water byproduct of an epoxy resin active diluent is evaporated and salted out. The solid epoxy resin toughened polyester is prepared by sufficiently using the organic waste liquid produced by preparing the solid epoxy resin active diluent as one of the raw materials, so that the production cost is reduced, the economic benefit of enterprise production is improved, direct discharge of the organic waste liquid is effectively avoided, then resource utilization of wastes is realized, and the method has certain economic benefits and social benefits.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and in particular relates to a preparation method of solid epoxy resin toughened polyester. Background technique [0002] Epoxy resin is a widely used organic chemical product with broad market prospects and has brought excellent economic benefits to the industry. At present, the production of one-step epoxy resin uses bisphenol A and epichlorohydrin as raw materials in the The reaction is generated under the action of sodium hydroxide, and its by-products are NaCl and H 2 O, the specific reaction formula is as follows: [0003] [0004] The epoxy resin E-12 prepared by one-step production has a high crosslinking density after curing, but has disadvantages such as large internal stress, brittleness, and poor impact resistance, crack resistance, and heat and humidity resistance, which lead to its application being restricted. Certain restrictions. [0005] Epoxy resin reactive dilu...

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Problems solved by technology

[0004] The epoxy resin E-12 prepared by the one-step method has high crosslinking density after curing, but has disadvantages such as large internal stress, brittle texture, and poor impact resistance, crack resistance, and heat and humidity resistance, which lead to its application being restricted. certain restrictions

[0005] Epoxy resin reactive diluent refers to low molecular weight epoxy compounds containing epoxy groups, which participate in the curing reaction of epoxy resin, not only can reduce the viscosity of the curing system, but also have little influence on the performance of epoxy resin after curing. Specifically, the by-products produced during the preparation of epoxy resin reactive diluents are mainly salt and water, and the by-products can be separated to form saturated brine and solid salt through conventional solid-liquid separation, and the saturated brine is passed through Neutralization and multi-effect evaporation can recover industrial-grade solid salt, while organic matter dissolved in saturated brine can be recovered from the concentrated mother liquor. The recovered organic waste liquid is light yellow and viscous. After testing and analysis, its It is a polyhydroxy organic compound, and the hydroxyl value is mainly between 600-1000mgKOH / g. Therefore, the organic waste liquid is directly treated as waste, which not only wastes resources, pollutes the environment, but also poses a threat to human health. Therefore, how to treat the above-mentioned organic waste The effective comprehensive utilization of liquid and the avoidance of environmental pollution are technical bottlenecks to be solved by researchers.

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