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Manufacturing method of polyamide

A manufacturing method and technology for polyamide, applied in the field of manufacturing polyamide, can solve the problems of inconvenient maintenance and complicated equipment, and achieve the effects of suppressing prepolymer precipitation and reducing quality deviation

Inactive Publication Date: 2016-07-06
TORAY IND INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in such a batch process combining melt polymerization and solid-phase polymerization, the equipment becomes complicated and inconvenience in maintenance becomes a problem

Method used

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  • Manufacturing method of polyamide
  • Manufacturing method of polyamide

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0089] 69.0 kg of hexamethylenediamine and 87.3 kg of water which do not contain water substantially were put into the 350-L volume dissolution tank which has a stirrer and a jacket heating function. Next, 40.7 kg of adipic acid containing substantially no water and 52.5 kg of terephthalic acid containing substantially no water were added to carry out nitrogen substitution. As a polymerization catalyst, sodium hypophosphite was further added so that it might become 0.05 mass parts with respect to 100 mass parts of polyamides finally obtained. Moreover, as a polymerization degree regulator, benzoic acid was added so that it might become 0.0133 times mole with respect to the total number of moles of dicarboxylic acid and diamine. At this time, the water content was 35% by mass with respect to the entire charged amount. Then, the dissolution tank was heated at 180° C. to evaporate and remove water in the system. Moisture content was removed until the final water content in the ...

Embodiment 2

[0092] A polyamide was obtained in the same manner as in Example 1 except that the conditions of the prepolymerization tank were changed as described in Table 1. Continuous operation was performed for 10 hours, sampling was performed every 30 minutes, and various physical properties were measured. The obtained polyamide had a viscosity (ηr) of 2.40 to 2.43, a melting point of 300 to 301°C, and a triamine content of 0.32 to 0.35%, and stabilized polymer properties were obtained.

Embodiment 3

[0096] Except having changed L / v as described in Table 1, it carried out similarly to Example 1, and obtained the polyamide. Continuous operation was performed for 10 hours, sampling was performed every 30 minutes, and various physical properties were measured. The obtained polyamide had a viscosity (ηr) of 2.39 to 2.44, a melting point of 299 to 301°C, and a triamine content of 0.33 to 0.37%, and stabilized polymer properties were obtained.

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Abstract

In order to stabilize the discharge of prepolymers and continuously produce polyamides with stable quality, there is provided a method for producing polyamides, which has the following steps: step (i), comprising dicarboxylic acid and diamine The polyamide precursor of the salt is polycondensed under pressure in a prepolymerization tank to obtain a prepolymer; and step (ii), the high degree of polymerization of the prepolymer in an extruder; When the molten prepolymer obtained in the step (i) is supplied to the extruder having a pressure lower than that of the prepolymerization tank through a secondary side piping provided on the downstream side of the pump, the 2 The relationship between the length L [cm] of the secondary side piping and the prepolymer discharge linear velocity v [cm / s] when the pump discharges the prepolymer is supplied in such a manner that 0.1 [s] ≤ L / v < 10 [s] the prepolymer.

Description

technical field [0001] The present invention relates to a process for the continuous production of polyamides from dicarboxylic acids and diamines. More specifically, it relates to a continuous polyamide production method in which a polyamide prepolymer is polymerized from a dicarboxylic acid and a diamine, and the polyamide prepolymer is continuously polymerized to a high degree by an extruder. Background technique [0002] Polyamides represented by nylon 66 are widely used in the automotive field, electrical and electronic fields, and extruded products such as films and monofilaments, represented by fibers for clothing and industrial use, taking advantage of their excellent properties. In recent years, there has been a further demand for materials that can withstand extremely thin molded products used in high-temperature environments. For example, in applications centered on automotive applications and connector applications, poly Amide needs gradually increase. Addition...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G69/04C08G69/28B29C48/29B29C48/37B29C48/40
CPCC08G69/28C08G69/265B29C48/29B29C48/37B29C48/40C08L77/06C08G69/36D01F6/90C08L77/00C08G69/26
Inventor 石丸拓赤池克美菊野太辅青木智之野田稔津田康纪
Owner TORAY IND INC