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Saturated polyester type low-shrinkage additive and application thereof

A low-shrinkage additive and polyester-based technology, which is applied in the field of polymer compound synthesis, can solve problems such as uneven coloring, poor coloring performance, and failure to meet performance requirements, and meet high-quality requirements, good coloring performance, and synthetic process conditions. mild effect

Active Publication Date: 2020-11-06
广东百汇达新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, non-polar low-shrinkage additives such as PE polyethylene powder and PS polystyrene developed in the early stage, these low-shrinkage additives have excellent coloring properties, can be used in molding products of various colors, and have certain volume shrinkage control Generally, the shrinkage rate can be controlled below 0.2%, which can meet the requirements of general molded plastic products, but for products that require particularly high dimensional accuracy and surface smoothness, such as automotive exterior parts, such low-shrinkage additives cannot meet the requirements to performance requirements
PAVc polyvinyl acetate, PES saturated polyester type low shrinkage additives can meet the shrinkage control requirements of less than 0.05% or even zero shrinkage, and the surface quality requirements of low surface waviness, but polyvinyl acetate, saturated polyester type low shrinkage Additives have poor coloring properties and uneven coloring, so they cannot be directly used for internally colored products

Method used

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  • Saturated polyester type low-shrinkage additive and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] In a 1L four-necked flask equipped with a thermometer, a stirrer, a nitrogen inlet tube and a reflux condenser, add 25g of pentaerythritol and 620g of ε-caprolactone in sequence, slowly raise the temperature to 140°C under the protection of nitrogen, and then dropwise add 1.9g of octanoic acid Sn catalyst, after the dropwise addition, reflux reaction in the range of 150°C-155°C for 5 hours. Cool down to 90°C, add 0.1g of tert-butylcatechol, stir evenly, and after the polymerization inhibitor is completely dissolved, add 326g of styrene to dilute. Cool and filter to obtain a near-water white transparent viscous liquid, which is a saturated polyester low shrinkage additive (named PES-1).

Embodiment 2

[0026] In a 1L four-neck flask with a thermometer, a stirrer, a nitrogen inlet tube and a reflux condenser, add 33g of ditrimethylolpropane (i.e. bis(trimethylol)propane)=, 594gε-caprolactone , under the protection of nitrogen, the temperature was slowly raised to 150°C, and then 1.5g of stannous octoate catalyst was added dropwise. After the dropwise addition, the mixture was refluxed for 8 hours in the range of 150°C-155°C. Cool down to 100°C, add 0.1g of tert-butylcatechol, stir evenly, and after the polymerization inhibitor is completely dissolved, add 337g of styrene to dilute. Cool and filter to obtain a near-water white transparent viscous liquid, which is a saturated polyester low shrinkage additive (named PES-2).

Embodiment 3

[0028] In a 1L four-neck flask equipped with a thermometer, a stirrer, a nitrogen inlet tube and a reflux condenser, 28g of dipentaerythritol and 628g of ε-caprolactone were sequentially added, and the temperature was slowly raised to 170°C under the protection of nitrogen, and then 2.0g of Stannous octoate catalyst, after the dropwise addition, reflux reaction in the range of 150°C-155°C for 8 hours. Cool down to 90°C, add 0.12g of tert-butylcatechol, stir evenly, and after the polymerization inhibitor is completely dissolved, add 392g of styrene to dilute. Cool and filter to obtain a near-water white transparent viscous liquid, which is a saturated polyester low shrinkage additive (named PES-3).

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Abstract

The invention discloses a saturated polyester type low-shrinkage additive which is prepared by the following steps: mixing polyhydric alcohols with three or more degrees of functionality with a lactone monomer, and heating to 140-170 DEG C under the protection of nitrogen; dropwise adding a catalyst, and carrying out a reflux reaction for 5-8 h at a temperature of 150-155 DEG C after the dropwiseaddition is completed; cooling to 90-100 DEG C, adding a polymerization inhibitor, uniformly stirring, adding an active diluent for dilution after the polymerization inhibitor is completely dissolved,cooling and filtering to obtain the saturated polyester type low-shrinkage additive. The saturated polyester low shrinkage agent has an excellent shrinkage rate control effect, and can make the coloring property of BMC better.

Description

technical field [0001] The invention belongs to the field of polymer compound synthesis, and in particular relates to a saturated polyester low-shrinkage additive for polyester molding compounds and its application. Background technique [0002] Polyester molding compound (SMC / BMC) is a composite material, usually composed of unsaturated polyester resin, low shrinkage additives, fillers, glass fibers and various additives. Due to its low raw material cost, high specific strength, specific modulus, and excellent flame retardancy and corrosion resistance, it is widely used in the fields of automobile transportation, construction, electrical, chemical and other fields. In addition, the SMC / BMC material adopts the compression molding process, which can realize automatic production, the production process is safe and environmentally friendly, the production efficiency is high, and the product quality is stable. In recent years, SMC / BMC materials and corresponding molding process...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/08C08G63/78C08L67/04
CPCC08G63/08C08G63/78C08L67/04
Inventor 余桐柏江林鹤黄贵明龙东毅吴伟涛
Owner 广东百汇达新材料有限公司
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