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Preparation method for polytrimethylene terephthalate

A technology of polytrimethylene terephthalate and polytrimethylene phthalate, which is applied in the field of preparation of polytrimethylene terephthalate, can solve the problems of inactivation of titanium compounds, improve intrinsic viscosity and solve catalyst activity problems Effect

Inactive Publication Date: 2017-04-26
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The patent points out that phosphorus compounds can also cause the inactivation of titanium compounds

Method used

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  • Preparation method for polytrimethylene terephthalate
  • Preparation method for polytrimethylene terephthalate
  • Preparation method for polytrimethylene terephthalate

Examples

Experimental program
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Effect test

Embodiment 1

[0035] Mix 142g of tetraisopropyl titanate with 46g of ethanol and 90g of lactic acid, and react for 4 hours at a temperature of 100°C in a stirred reactor. Add 36g of magnesium acetate and 91g of triethyl phosphate to the reactant. In the reactor, the reaction was carried out for 4 hours under the temperature condition of 120°C. The reaction product is placed in a reactor equipped with a fractionation device, and ethanol and isopropanol are distilled off to make a catalyst. The catalyst is mixed with 1,3-propanediol, wherein the mass fraction of titanium atoms is 4%.

[0036] 600g of terephthalic acid, 439g of 1,3 propylene glycol, 3.1g of sorbitol and 1.49g of catalyst are mixed to form a slurry, which is added to a polymerization kettle for esterification reaction. The esterification temperature is 230°C and the pressure is 0.25MPa. The rectifying device discharges the water generated by the reaction, and reacts for 2 hours. After the esterification is completed, the pres...

Embodiment 2

[0039] Mix 142g of tetraisopropyl titanate with 46g of ethanol and 192g of citric acid, and react in a stirred reactor at a temperature of 100°C for 4 hours, add 36g of magnesium acetate and 91g of triethyl phosphate to the reactant, In a stirred reactor, the reaction was carried out at a temperature of 120° C. for 4 hours. The reaction product is placed in a reactor equipped with a fractionation device, and ethanol and isopropanol are distilled off to make a catalyst. The catalyst is mixed with 1,3-propanediol, wherein the mass fraction of titanium atoms is 4%.

[0040]600g of terephthalic acid, 439g of 1,3 propylene glycol, 3.1g of sorbitol and 1.49g of catalyst are mixed to form a slurry, which is added to a polymerization kettle for esterification reaction. The esterification temperature is 230°C and the pressure is 0.25MPa. The rectifying device discharges the water generated by the reaction, and reacts for 2 hours. After the esterification is completed, the pressure is...

Embodiment 3

[0043] Mix 142g of tetraisopropyl titanate with 46g of ethanol and 192g of citric acid, and react for 4 hours at a temperature of 100°C in a stirred reactor, and add 61g of zinc lactate and 91g of triethyl phosphate to the reactant. In a stirred reactor, the reaction was carried out at a temperature of 120° C. for 4 hours. The reaction product is placed in a reactor equipped with a fractionation device, and ethanol and isopropanol are distilled off to make a catalyst. The catalyst is mixed with 1,3-propanediol, wherein the mass fraction of titanium atoms is 4%.

[0044] 600g of terephthalic acid, 439g of 1,3 propylene glycol, 3.1g of sorbitol and 1.49g of catalyst are mixed to form a slurry, which is added to a polymerization kettle for esterification reaction. The esterification temperature is 230°C and the pressure is 0.25MPa. The rectifying device discharges the water generated by the reaction, and reacts for 2 hours. After the esterification is completed, the pressure is...

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Abstract

The invention relates to a preparation method for polytrimethylene terephthalate polymerizated by phthalic acid and 1,3-propanediol. The preparation method mainly solves the problems of the existing technology in which the molecular weight of polytrimethylene terephthalate is low and polytrimethylene terephthalate is easily degradable under high temperatures. The invention utilizes the preparation method of polytrimethylene terephthalate, comprising the following steps: a) taking phthalic acid, other aromatic diacid, 1,3-propanediol and more than one or two polyhydroxy compounds as raw materials, adding a catalyst, the esterification reaction temperature is 220 to 300 DEG C and the esterification reaction pressure is 0.1 to 0.5 MPa for the esterification reaction to obtain a prepolymer; b) a technical plan that prepolymerizing the prepolymer under the vacuum condition that the prepolymerization reaction temperature is 245-265 DEG C and the prepolymerization reaction pressure is 300 to 1000 Pa solves the problems well and the technical plan can be used for preparing polytrimethylene terephthalate of high molecular weight.

Description

technical field [0001] The present invention relates to a preparation method of poly(trimethylene terephthalate) with improved molecular weight and thermal stability, which is especially suitable for the manufacture of high mechanical properties, which need to be processed under high temperature conditions by spinning, injection molding, extrusion molding and other melting processing methods. Polytrimethylene terephthalate resin under processing. Background technique [0002] Polytrimethylene terephthalate is a high-end fiber material that combines the mechanical strength, antistatic and chemical temperature properties of polyester materials and the high resilience of nylon materials. It can also be used in engineering plastics, packaging films and other products production. The processing technology of polytrimethylene terephthalate is mainly melt processing, and the product needs to be processed at a temperature above the melting point to ensure that the material has suff...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/85C08G63/183
Inventor 宋歌周文乐熊金根章瑛虹
Owner CHINA PETROLEUM & CHEM CORP
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