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A method for separating nylon 66 and nylon 6 in polyamide heat insulation strips

A technology of heat insulation strip and polyamide, which is applied in recycling technology, plastic recycling, etc., can solve the problems of unprepared measurement results, inaccurate separation results, inaccurate separation, etc., and achieves low cost, low equipment requirements, Separation of high-accuracy effects

Inactive Publication Date: 2018-08-14
WUHAN TEXTILE UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the melting peak of nylon 66 is 260°C and the melting peak of nylon 6 is 220°C, the melting peaks are likely to overlap and cause the measurement results to be unprepared, so that nylon 66 and nylon 6 in polyamide insulation strips cannot be accurately separated;
[0004] There is also a method of separating first and then detecting, which uses the difference in solubility of nylon 66 and nylon 6 in hydrochloric acid to separate nylon 66 and nylon 6 in polyamide insulation strips. The nylon 66 separated by this method contains nylon 6, which leads to separation. The result is not accurate

Method used

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  • A method for separating nylon 66 and nylon 6 in polyamide heat insulation strips
  • A method for separating nylon 66 and nylon 6 in polyamide heat insulation strips
  • A method for separating nylon 66 and nylon 6 in polyamide heat insulation strips

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A. According to the following ratio

[0022]

[0023] Prepare a mixed solution, weigh 5g of polyamide insulation strip particles containing 54.95% nylon 66 and 13.74% nylon 6, and dissolve them in the mixed solution. Ultrasonic vibration and stirring are performed at 70°C under airtight conditions for 6 hours. The particle size of hot bar particles is less than 5mm;

[0024] B. Use a microporous cellulose filter membrane with a pore size of 0.45mm to perform the first suction filtration of the mixed solution dissolved with polyamide heat insulation strip particles to obtain a primary filtrate, slowly add water to the primary filtrate to dilute the precipitate, and gradually dilute the The primary filtrate of the precipitation is sampled and titrated, and when the concentration of hydrogen ions in the primary filtrate of the diluted precipitation is 5.05mol / l, stop adding water, and then the primary filtrate of the diluted precipitation that reaches the titration valu...

Embodiment 2

[0028] A. According to the following ratio

[0029]

[0030] Prepare a mixed solution, weigh 5g of polyamide insulation strip particles containing 48.08% nylon 66 and 20.6% nylon 6, and dissolve them in the mixed solution. Ultrasonic vibration and stirring are performed at 70°C under airtight conditions for 6 hours. The particle size of hot bar particles is less than 5mm;

[0031] B. Use a microporous cellulose filter membrane with a pore size of 0.45mm to perform the first suction filtration of the mixed solution dissolved with polyamide heat insulation strip particles to obtain a primary filtrate, slowly add water to the primary filtrate to dilute the precipitate, and gradually dilute the The primary filtrate of the precipitation is sampled and titrated, and when the concentration of hydrogen ions in the primary filtrate of the diluted precipitation is 5.20mol / l, stop adding water, and then the primary filtrate of the diluted precipitation that reaches the titration value...

Embodiment 3

[0035] A. According to the following ratio

[0036]

[0037] Prepare a mixed solution, weigh and dissolve the heat-insulating strip particles containing 41.21% nylon 66 and 27.47% nylon 6 in the mixed solution, ultrasonically vibrate and stir under airtight conditions at 70°C for 6 hours, and the polyamide heat-insulating strip particles The particle size is less than 5mm;

[0038] B. Use a microporous cellulose filter membrane with a pore size of 0.45mm to perform the first suction filtration of the mixed solution dissolved with polyamide heat insulation strip particles to obtain a primary filtrate, slowly add water to the primary filtrate to dilute the precipitate, and gradually dilute the The primary filtrate of the precipitation is sampled and titrated, and when the concentration of hydrogen ions in the primary filtrate of the diluted precipitation is 5.53mol / l, stop adding water, and then the primary filtrate of the diluted precipitation that reaches the titration valu...

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Abstract

The invention relates to a method for separating nylon 66 and nylon 6 in polyamide thermal barrier strips. According to the scheme, a mixed solution containing concentrated hydrochloric acid, a saturated methanol solution of calcium chloride, m-cresol, formic acid and diethylene glycol is used for dissolving polyamide thermal barrier strip particles, nylon 66 and nylon 6 are separated precisely from the polyamide thermal barrier strips, and the content of nylon 66 and nylon 6 in the polyamide thermal barrier strips can be determined accurately and conveniently; Compared with a conventional method, , the problem that nylon 66 and nylon 6 in the polyamide thermal barrier strips cannot be separated accurately is solved through separation of nylon 66 and nylon 6 in the polyamide thermal barrier strips, wherein the problem is caused by the facts that a DSC method is adopted for polyamide thermal barrier strip identification at present and the content of nylon 66 and nylon 6 in the polyamide thermal barrier strips is calculated according to the areas of melting peaks, the melting peaks generate cross overlapping easily because the melting peak of nylon 66 is 260 DEG C while the melting peak of nylon 6 is 220 DEG C, and a determined result is not accurate accordingly. The technical process is simple, equipment requirements are low, the cost is lower, and the separation accuracy is high.

Description

technical field [0001] The invention relates to a method for separating nylon 66 and nylon 6 in polyamide heat insulating strips. Background technique [0002] The current heat insulation strip market is divided into three levels: one is imported polyamide heat insulation strips; the other is domestic polyamide heat insulation strips produced in 2003; the third is domestic polyvinyl chloride heat insulation strips. Among them, there is a huge difference in the linear expansion coefficient between the thermal insulation strip made of third-level polyvinyl chloride and aluminum alloy, as well as its insufficient strength and poor aging resistance. eliminated. Polyamide insulation strips generally require that the content of nylon 66 should not be lower than 66%. At present, there are a large number of polyamide insulation strips with non-compliant nylon 66 content on the market, which cannot meet the mechanical properties of many building materials and cause great harm. The...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J11/08
CPCC08J11/08C08J2377/02C08J2377/06Y02W30/62
Inventor 范玲玲彭硕许杰魏成卓徐卫林柏自奎
Owner WUHAN TEXTILE UNIV
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