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Preparation method of macromolecular polyester for food contact material

A technology of food contact materials and high molecular polyester, applied in the direction of chemical recycling, etc., can solve the problems of unusability, many side reactions, and high molecular weight of polyester resin.

Inactive Publication Date: 2021-04-20
建德市汶晖新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Patent ZL201110432374.7 discloses a low-viscosity unsaturated polyester and its application. It is mainly composed of diols, saturated dibasic acids and unsaturated dibasic acids. raw materials, and phthalic acid, which is easy to produce phthalate-like toxic substances. Although the polyester prepared by the invention has a low viscosity, its molecular weight is only 500-800 Daltons, and the migration resistance of the product is obviously relatively low. Difference
[0003] Patent ZL201310228615.5 discloses an environmentally friendly polyester resin and its production process. The patent uses purified terephthalic acid, diethylene glycol, ethylene glycol, neopentyl glycol, and plastic chip waste as raw materials to synthesize polyester resin. , this kind of synthetic polyester resin has a super large molecular weight, and at the same time uses plastic chip waste as raw material, obviously it cannot be used in the field of food contact materials
[0004] Patent ZL201210237138.4 discloses a PVC polyester plasticizer material, which is formed by melting and polycondensing adipic acid, trimethylolpropane, PVC and other raw materials. This preparation method has many side reactions and poor controllability of intermediate products, which belongs to poly For ester applications, not for food contact applications
[0005] Patent ZL201310244270.2 discloses a polymer polyester plasticizer and its preparation method and application. The preparation method uses 2-propylheptanol, 1-3-dimethylpropanediol, neopentyl glycol and adipic acid as Raw materials are made of polymer polyester, these raw materials do not belong to the raw materials allowed by China's GB9685 and EU 10 / 2011 / EU food contact material regulations, and cannot be used in the field of food contact materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A preparation method of polymer polyester for food contact materials, comprising the following steps:

[0023] (1) Put 76 parts of 1,2-propanediol, 90 parts of 1,3-butanediol, 90 parts of 1,4-butanediol, and 438 parts of adipic acid into the No. 1 reactor, and add 10 parts of copper sulfate as The catalyst was reacted for 1 hour at 160°C and a stirring speed of 30 rpm;

[0024] (2) The mixture of the first step reaction is pumped into No. 1 static tower, and the upper layer of water is released after 1 hour, and the esterified product in the middle layer is pumped into No. 2 reaction kettle. A small amount of solids in the lower layer are copper sulfate, which is put into Reactor No. 1, so that the catalyst can be recycled;

[0025] (3) Add 50 parts of n-octanol to No. 2 reaction kettle, mix with the esterified product drawn in in the second step, add 12 parts of copper sulfate as a catalyst, and react 2 parts at 120°C and stirring speed of 60 rpm. Hour;

[0026] (4)...

Embodiment 2

[0029] A preparation method of polymer polyester for food contact materials, comprising the following steps:

[0030] (1) Put 76 parts of 1,2-propanediol, 90 parts of 1,3-butanediol, 90 parts of 1,4-butanediol, and 438 parts of adipic acid into the No. 1 reactor, and add 10 parts of copper sulfate as The catalyst was reacted for 3 hours at 185°C and a stirring speed of 80 rpm;

[0031] (2) The mixture of the first step reaction is pumped into No. 1 static tower, and the upper layer of water is released after 1 hour, and the esterified product in the middle layer is pumped into No. 2 reaction kettle. A small amount of solids in the lower layer are copper sulfate, which is put into Reactor No. 1, so that the catalyst can be recycled;

[0032] (3) Add 90 parts of n-octanol to No. 2 reaction kettle, mix with the esterified product drawn in the second step, add 12 parts of copper sulfate as a catalyst, and react 3 parts at 155°C and stirring speed of 90 rpm. Hour;

[0033] (4) T...

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PUM

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Abstract

The invention discloses a preparation method of polymer polyester for a food contact material, which comprises the following steps: proportionally adding the raw materials into a No.1 reaction kettle, and adding copper sulfate as a catalyst; pumping a mixture obtained in the first step into a No.1 standing tower, discharging an upper-layer water solution, pumping a middle-layer ester into a No. 2 reaction kettle, drying a small amount of copper sulfate serving as a lower-layer solid, and feeding the dried copper sulfate into the No.1 reaction kettle; adding n-octyl alcohol into the No.2 reaction kettle, mixing with the ester pumped in the in step 2, and adding copper sulfate to serve as a catalyst; 3, pumping the mixture obtained in the step 3 into a No.2 standing tower, discharging the upper water, pumping the middle polyester into a vacuum kettle, drying a small amount of copper sulfate in the lower solid, and adding into the No.2 reaction kettle; dehydrating the polyester pumped into the vacuum kettle in the step 4, and vacuumizing to obtain the polymer polyester. The method can be used for synthesizing the high-molecular polyester meeting the requirements of food contact material laws and regulations in lists, so that the application requirements of the field of food contact materials on the high-molecular polyester are met.

Description

technical field [0001] The invention relates to the field of preparation methods of food-grade high-molecular polyester, in particular to a preparation method of high-molecular polyester for food contact materials. Background technique [0002] Patent ZL201110432374.7 discloses a low-viscosity unsaturated polyester and its application. It is mainly composed of diols, saturated dibasic acids and unsaturated dibasic acids. raw materials, and phthalic acid, which is easy to produce phthalate-like toxic substances. Although the polyester prepared by the invention has a low viscosity, its molecular weight is only 500-800 Daltons, and the migration resistance of the product is obviously relatively low. Difference. [0003] Patent ZL201310228615.5 discloses an environmentally friendly polyester resin and its production process. The patent uses purified terephthalic acid, diethylene glycol, ethylene glycol, neopentyl glycol, and plastic chip waste as raw materials to synthesize pol...

Claims

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Application Information

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IPC IPC(8): C08G63/83C08G63/16
CPCY02P20/584
Inventor 徐文军
Owner 建德市汶晖新材料科技有限公司