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Method for producing hot melt adhesive by using recovered nylon

A technology for recycling nylon and hot-melt adhesives, applied in the direction of adhesives, etc., can solve the problems of not being able to adapt to clothing interlinings, etc., and achieve the effects of narrow melting range, low investment, and good application prospects

Active Publication Date: 2012-04-04
河南申豫之星空天技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Generally, the melting point range of polyamide hot melt adhesive for clothing is 100-125°C, while the melting point of homopolynylon is mostly above 200°C. Therefore, it cannot meet the requirements of clothing interlining.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A kind of method that utilizes reclaimed nylon to produce hot-melt adhesive, comprises following preparation steps:

[0035] (1) Weigh 2 kg of waste nylon 6, 0.5 kg of water, and put them into a high temperature and high pressure reactor; the solid acid catalyst uses 928 type macroporous polystyrene sulfonic acid resin (loaded with aluminum trichloride) 5 g and SO 4 2- / TiO 2 Solid acid 2g (both catalysts are provided by East China University of Science and Technology); after adding the catalyst, the reactor was evacuated, heated up, and reacted for 1.5 hours under the conditions of 280 ℃ of temperature and reaction pressure of 1.9 Mpa;

[0036] (2) Filter out the catalyst and other solids from the reaction product of step (1), and put the remaining liquid into another high-temperature and high-pressure reactor;

[0037] (3) Put 0.5 g of dicumyl peroxide into a 500 g polypropylene wax beaker, slowly heat to 160°C and stir evenly; Polypropylene wax is oxidized to acid...

Embodiment 2

[0043] A kind of method that utilizes reclaimed nylon to produce hot-melt adhesive, comprises following preparation steps:

[0044] (1) Weigh 1.6 kg of recycled nylon 6, 0.9 kg of water, and put them into a high-temperature and high-pressure reactor; the reaction catalyst uses 1.5 g of HD-type acidic molecular sieve catalyst and 3.9 g of GH-type phosphotungstic acid heteropolyacid catalyst (both catalysts are Provided by East China University of Science and Technology); After adding the catalyst, the reactor was evacuated, the temperature was raised, and the reaction was carried out for 1.6 hours at a temperature of 265°C and a reaction pressure of 1.8Mpa;

[0045] (2) Filter out the catalyst and other solids from the reaction product of step (1), and put the remaining liquid into another high-temperature and high-pressure reactor;

[0046] (3) Put 0.25 g of dicumyl peroxide into a 250 g polyethylene wax beaker, slowly heat to 160°C and stir evenly; Polyethylene wax is oxidiz...

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PUM

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Abstract

The present invention relates to a method for producing a hot melt adhesive by using recovered nylon. Main steps of the method comprise: 1, adopting a composite solid acid catalysis method or a non-catalytic method to degrade recovered nylon and water at a high temperature under high pressure; adding the generated product to a reactor to carry out high temperature cracking; adding the generated middle and small molecular nylon to a high temperature and high pressure reactor; 2, adopting an air catalytic oxidation method to oxidize polyethylene wax and polypropylene wax; adding the oxidized polyethylene wax or the oxidized polypropylene wax to the reactor; 3, refining nylon acid, then adding the refined nylon acid to the reactor; 4, adding diamine to the reactor; 5, adopting a vacuum pump to carry out vacuumizing for the reactor, and then introducing nitrogen; 6, carrying out slow temperature increasing and pressure increasing for the reactor, carrying out the reaction for 0.1-6 hours at the temperature of 160-310 DEG C under reaction pressure of 0.5-3.8 MPa; 7, introducing cooling water after completing the reaction, reducing the pressure, reducing the temperature of the materials in the reactor, discharging the material, then carrying out treatments of pelletizing and crushing to prepare the hot melt adhesive powder, wherein the particle size of the hot melt adhesive powder meets the process requirement.

Description

technical field [0001] The invention relates to a method for producing hot-melt adhesives by using recycled nylon and nylon acid. The produced hot-melt adhesives can be widely used as bonding materials in the fields of textiles, automobiles, leather, paints, inks, and the like. technical background [0002] Nylon, referred to as PA, mainly has three categories: aliphatic nylon, aliphatic-aromatic nylon, and aromatic nylon. Among them, aliphatic nylon has the most varieties, large output, and wide application. Its name depends on the specific number of carbon atoms in the synthetic monomer. my country's annual demand for nylon is about 300,000 tons, so a large amount of waste nylon is also produced every year. However, nylon is difficult to degrade under natural conditions, so if these waste nylons are not properly recycled, serious pollution will be caused to the environment. Therefore, it is of great significance to recycle waste nylon as a resource. At the same time, du...

Claims

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Application Information

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IPC IPC(8): C08G69/36C09J177/02C09J177/06
Inventor 张建雨冯强冯彤彤冯跃跃张会学张建信冯夫军张小霞张建军
Owner 河南申豫之星空天技术有限公司
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