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Method for decoloring waste PVB plastic

A plastic and waste technology, applied in the field of decolorization and recycling of waste PVB plastics, can solve the problems of inability to compete with imported products, low output, etc., and achieve the effects of efficient decolorization, convenient operation and cost saving

Inactive Publication Date: 2009-11-04
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Later, only Guizhou Organic Chemical Pilot Factory and Shanghai Institute of Optics produced PVB, but the output was low and the quality could not compete with imported products

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 100g black waste and old PVB plastics are fed into the sealed reaction device, add solvent diethyl phthalate 200ml, utilize magnetic stirrer to stir 30min at room temperature, then separate plastics and dark solution; The decolorized plastics that obtains adopts solvent ( Each solvent consumption is 200mi) and repeats leaching twice again, and the obtained plastic solid is vacuum-dried, is colorless and transparent, weighs 95.6g, and the recovery rate of waste PVB plastic is 95.6%.

[0029] Merge the pigment solution (600ml) that obtains three times, control temperature is 80 ℃~90 ℃, pressure is 0.01MPa, carry out vacuum distillation recovery solvent, obtain colorless and transparent solvent 591ml and remaining pigment solution of 13ml, solvent recovery rate is 98.5% . Through infrared spectrum and ultraviolet spectroscopic analysis, the spectrograms of recovered solvent diethyl phthalate and pure diethyl phthalate can completely overlap, indicating that the recovered s...

Embodiment 2

[0031] Feed 100g of light blue waste PVB plastic into a sealed reaction device, add 900ml of solvent diethyl phthalate, soak at room temperature for 150min, and then separate the plastic from the dark solution; It is colorless and transparent, weighing 94.1g, and the recovery rate of waste PVB plastic is 94.1%. 900ml of pigment solution was distilled under reduced pressure at 80°C-90°C and 0.01MPa, and the solvent was recovered to obtain 885ml of colorless and transparent solvent and 19ml of remaining pigment solution. The solvent recovery rate was 98.3%.

Embodiment 3

[0033] Feed 100g of black waste PVB plastic into a sealed reaction device, add solvent ethyl acrylate 1000ml, soak at room temperature for 120min, and then separate the plastic and dark solution; the obtained plastic solid is colorless and transparent after vacuum drying, weighing The weight is 96.2g, and the recycling rate of waste PVB plastic is 96.2%. 1000ml of pigment solution was distilled under reduced pressure at 70°C and 0.01MPa, and the solvent was recovered to obtain 975ml of colorless and transparent solvent and 27ml of remaining pigment solution. The solvent recovery rate was 97.5%.

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Abstract

A method for de-coloring waste PVB plastic is carried out by putting PVB plastic into sealed reactor, adding into solvent, leach reacting in proportion of solvent volume: PVB plastic mass=1-10, discharging leached coloring matter from reactor, decompress distilling, and recovering solvent phthalate, organic phosphate, aliphatic ester and their mixtures. It's cheap, simple, convenient and efficient.

Description

technical field [0001] The invention relates to a method for decolorizing and recycling waste PVB plastics. Background technique [0002] In 1935, American scientists invented a polymer material that can be sandwiched between two layers of ordinary glass-polyvinyl butyral (Polyvinlbutaral, abbreviated as PVB). It is a polymer formed by the condensation reaction of high molecular weight polyvinyl alcohol (PVA) and butyraldehyde. The extruder system and precise thickness control can form a continuous film with a thickness of 0.38-1.52mm. The US government legislated in 1938 to use PVB as the base material for the front windshield of motor vehicles. After more than 70 years of research and development and production practice, it has been proved that PVB film is still an irreplaceable raw material for the production of glass interlayers. Now more countries produce it as a standard product. It plays a very important role in protecting the safety of passengers. Overcoming the po...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J11/08C08L29/14
CPCC08J11/08C08J2329/14Y02W30/62
Inventor 王晖符剑刚顾帼华陈立于婉婷
Owner CENT SOUTH UNIV