Continuous solution polymerization process for pre-polymerizing spandex

A polymerization method and pre-polymerization technology, applied in the direction of one-component synthetic polymer rayon, fiber chemical characteristics, one-component polyurethane rayon, etc., can solve the difficulty of cooling, can not achieve continuous polymerization, and prepolymer viscosity is high question

Inactive Publication Date: 2008-12-31
杭州青云新材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This invention patent is for the semi-continuous polymerization of spandex, which cannot achieve continuous polymerization, and cannot completely eliminate the disadvantages of batch polymerization. It also has the disadvantages of high viscosity of the prepolymer and difficulty in cooling. regular cleaning

Method used

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  • Continuous solution polymerization process for pre-polymerizing spandex

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Add 150kg of N,N-dimethylacetamide (DMAC) or N,N-dimethylformamide 9 to the diisocyanate dissolving kettle 1, lower the temperature of the system to 5 degrees, and slowly add 150kg of molten state under stirring 4,4'-diphenylmethane diisocyanate (MDI) 7, after completely dissolving, stir evenly, put into the temporary storage tank 3 of diisocyanate solution for subsequent use; Add 674.3 kg of molten polytetramethylene ether glycol (PTMG) or poly(tetramethylene-3-methyl-tetramethylene ether) glycol 8 (molecular weight is 1800), the system temperature is reduced to 5 degree, dissolved into 674.3kg of N, N-dimethylacetamide (DMAC) or N, N-dimethylformamide 9, put into polyether glycol solution temporary storage tank 4 for subsequent use.

[0034] With the flow rate of 50kg / h, 4,4'-diphenylmethane diisocyanate (MDI) solution is pumped into the high-speed dynamic mixer 5 with a metering pump, and the poly(IV) Methylene ether glycol (PTMG) solution was mixed. The mixed reac...

Embodiment 2

[0035] Embodiment 2: Add 122.2kg of N,N-dimethylacetamide (DMAC) or N,N-dimethylformamide 9 in the diisocyanate dissolving kettle 1, reduce the system temperature to 10 degrees, slowly stir Slowly add 4,4'-diphenylmethane diisocyanate (MDI) 7 of the solid state of 100kg pulverization, after dissolving completely, stir well, put into diisocyanate solution temporary storage tank 3 for subsequent use; Add 470.1kg of molten polytetramethylene ether glycol (PTMG) or poly(tetramethylene-3-methyl-tetramethylene ether) glycol 8 (molecular weight is 2000) in the ether glycol dissolving kettle 2 , the system temperature is reduced to 5 degrees, dissolved in 574.6kg of N,N-dimethylacetamide (DMAC) or N,N-dimethylformamide 9, and put into the polyether glycol solution temporary storage tank 4 in spare.

[0036]With the flow rate of 45kg / h, 4,4'-diphenylmethane diisocyanate (MDI) solution is pumped into the high-speed dynamic mixer 5 with a metering pump, and the poly(IV) Methylene ether...

Embodiment 3

[0037] Embodiment 3: Add 150kg of N,N-dimethylacetamide (DMAC) or N,N-dimethylformamide 9 in the diisocyanate dissolving kettle 1, reduce the system temperature to 15 degrees, and slowly Add 4,4'-diphenylmethane diisocyanate (MDI) 7 of the solid state of 100kg pulverization, after dissolving completely, stir well, put into diisocyanate solution temporary storage tank 3 for subsequent use; Use the same method, in polyether Polytetramethylene ether glycol (PTMG) or poly(tetramethylene-3-methyl-tetramethylene ether) glycol 8 (molecular weight is 1800) of the polytetramethylene ether glycol (PTMG) of the solid state that adds 411kg pulverizing in the glycol dissolving kettle 2 ), the system temperature is reduced to 5 degrees, dissolved into 616.5kg of N,N-dimethylacetamide (DMAC) or N,N-dimethylformamide 9, and put into a temporary storage tank for polyether glycol solution 4 spare.

[0038] With the flow rate of 50kg / h, 4,4'-diphenylmethane diisocyanate (MDI) solution is pumped...

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Abstract

The invention provides a continuous solution polymerization method for pre-polymerizing polyurethane, which is mainly characterized in that diisocyanate and polyether diol are respectively dissolved through polar solvents to prepare solutions at certain concentrations; then the two solutions are mixed evenly in a mixer according to specific proportion; the mixed solutions pass through a static mixer pipe with specific length and react thoroughly under specific temperature, producing prepolymer solution with isocyanate groups at both ends. The prepolymer solution can be directly used for chain extension reaction and the macromolecule polyurethane solution produced can be used in filature for producing polyurethane fibre. The invention provides a method to prepare polyurethane prepolymer through continuous solution polymerization; the continuous process of the pre-polymerization of polyurethane can eliminate the differences between different batches in batch polymerization and the prepolymer is of moderate viscosity and is convenient to cool and transfer, and the wall of the reaction pipe is not easy to crust.

Description

technical field [0001] The invention relates to a prepolymerization reaction in a polymerization method of a dry spinning spandex process, in particular to a continuous solution polymerization method for spandex prepolymerization. Background technique [0002] The polymerization of dry-spun spandex can be divided into continuous polymerization, semi-continuous polymerization and batch polymerization. Continuous polymerization means that pre-polymerization and chain extension reaction are carried out continuously; semi-continuous polymerization means that pre-polymerization is intermittent, while chain extension reaction is carried out continuously; intermittent polymerization means that both pre-polymerization and chain extension reaction are intermittent ongoing. Generally speaking, whether it is continuous polymerization, semi-continuous polymerization or batch polymerization, the prepolymerization part is mostly carried out in the form of bulk polymerization, that is, un...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/10C08G18/48D01F6/70D01F6/78
Inventor 刘安平
Owner 杭州青云新材料股份有限公司
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