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Urea resin modifier with waste polyurethane as raw material and application of urea resin modifier

A technology of urea-formaldehyde resin and polyurethane, applied in polyurea/polyurethane adhesives, applications, and other household appliances, can solve air pollution and other problems, achieve the effect of reducing formaldehyde emission and increasing wet shear strength

Inactive Publication Date: 2018-04-03
SHANDONG AGRICULTURAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the traditional domestic treatment method is to landfill or incinerate polyurethane waste. Although the volume of polyurethane will be reduced to 1% of the initial volume after incineration, the NO produced in the process x , HCl, CHCl 3 gases that pollute the air

Method used

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  • Urea resin modifier with waste polyurethane as raw material and application of urea resin modifier
  • Urea resin modifier with waste polyurethane as raw material and application of urea resin modifier

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Wash the waste rigid polyurethane foam (from the insulation layer of the dismantled waste refrigerator) with clean water, put it into a blast drying oven, and dry it at 103°C for 30 minutes, and process the dried polyurethane block with a grinder, so that after grinding The polyurethane powder passed through a sieve with a diameter of 1.0mm (millimeter). Add 60 parts of diethylene glycol into a three-necked flask, add 0.2 parts of sodium hydroxide, start the stirrer, heat up to 60°C, add polyurethane powder, heat up to 160°C, and react at this temperature for 2 hours until the polyurethane The powder dissolves completely. The liquefied product was cooled to 60°C, and after standing for stratification, the upper layer liquid was taken with a separatory funnel, and filtered through a filter with a filter hole of 100 μm. The basic properties of the obtained polyurethane liquefied product are shown in Table 1.

[0023] 100 parts of urea-formaldehyde resin (formaldehyde / ur...

Embodiment 2

[0025] Wash the waste rigid polyurethane foam (from the insulation layer of the dismantled waste refrigerator) with clean water, put it into a blast drying oven, and dry it at 103°C for 30 minutes, and process the dried polyurethane block with a grinder, so that after grinding The polyurethane powder was passed through a sieve with a diameter of 1.0 mm. Add 80 parts of dipropylene glycol into a three-necked flask, add 0.15 parts of sodium hydroxide, start the stirrer, heat up to 60°C, add polyurethane powder, heat up to 180°C, and react at this temperature for 2 hours until the polyurethane powder is completely dissolve. The liquefied product was cooled to 60°C, and after standing for stratification, the upper layer liquid was taken with a separatory funnel, and filtered through a filter with a filter hole of 100 μm. The basic properties of the obtained polyurethane liquefied product are shown in Table 1.

[0026] 100 parts of urea-formaldehyde resin (formaldehyde / urea molar...

Embodiment 3

[0028] Wash the waste rigid polyurethane foam (from the insulation layer of the dismantled waste refrigerator) with clean water, put it into a blast drying oven, and dry it at 103°C for 30 minutes, and process the dried polyurethane block with a grinder, so that after grinding The polyurethane powder was passed through a sieve with a diameter of 1.0 mm. Add 100 parts of triethylene glycol into a three-necked flask, add 0.2 parts of sodium hydroxide, start the stirrer, heat up to 60°C, add polyurethane powder, heat up to 190°C, and react at this temperature for 2 hours until the polyurethane The powder dissolves completely. The liquefied product was cooled to 60°C, and after standing for stratification, the upper layer liquid was taken with a separatory funnel, and filtered through a filter with a filter hole of 100 μm. The basic properties of the obtained polyurethane liquefied product are shown in Table 1.

[0029] 100 parts of urea-formaldehyde resin (formaldehyde / urea mol...

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Abstract

The invention relates to a urea resin modifier with waste polyurethane as a raw material and application of the urea resin modifier. The urea resin modifier is prepared by cleaning a polyurethane waste, drying for 30 minutes in an air blown drying tank at 103 DEG C, grinding dried blocky polyurethane into polyurethane powder of which the diameter is 0.5-1.5mm by using a grinding machine, adding aliquefier and a catalyst into the polyurethane powder to implement liquidation for 2-4 hours at 160-200 DEG C under a normal pressure condition, cooling a liquidated substance to 60 DEG C, leaving tostand and layer, collecting an upper-layer liquid by using a separating funnel, and filtering by using a filter with filter holes of 100mu m, thereby obtaining a purified liquidated polyurethane substance. The wet shearing strength of plywood made of the urea resin modifier provided by the invention through pressing is improved by 20% or greater, and the formaldehyde emission rate of the plywood is reduced by 45% or greater.

Description

technical field [0001] The invention relates to a wood adhesive modifier, in particular to a urea-formaldehyde resin modifier using waste polyurethane as a raw material and its application. Background technique [0002] Polyurethane is a widely used polymer material, and its main chain contains repeating units of carbamate groups (-NH-COO-). In 2015, the global consumption of polyurethane materials was as high as 16 million tons, and the annual waste of polyurethane is also huge. At present, the United States obtains 800,000 tons of waste polyurethane foam materials from scrapped cars every year. In 2014, the China Automotive Technology and Research Center organized the drafting of the industry standard "Technical Specifications for Scrapped Vehicle Shredding" (draft for comments), which stipulates: "The comprehensive recovery rate of renewable resources after crushing and sorting cannot be lower than 90%." The recycling of polyurethane foam materials will become an urgent...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J11/24C09J161/24C09J175/04B27N3/00C08L75/04
CPCB27N3/002C08J11/24C08J2375/04C09J161/24C08L75/04Y02W30/62
Inventor 李琪毛安席恩华贾万达
Owner SHANDONG AGRICULTURAL UNIVERSITY