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Method for removing colored particles in polyvinyl alcohol product

A technology for colored granules and products, which is applied in sorting and other directions, can solve the problems of heavy workload for workers and unclean colored granules, and achieve the effects of simple operation, improved appearance and hue, and reduced number of defective materials

Active Publication Date: 2015-06-10
CHINA PETROCHEMICAL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the less colored particles in PVA products, the better. In order to meet this requirement, the artificial material selection method is adopted in the prior art, and the colored particles in PVA products are manually selected. The workload is heavy, and the colored particles are not cleaned at the same time

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Add polyvinyl alcohol 18-99 with a degree of polymerization of 1800±50 and a degree of alcoholysis of 98.9% (mol / mol) into the feeding hopper above the equipment, and adjust the equipment parameters as follows: the air pressure is 0.20Mpa, the feeding rate is 60%, and the sensitivity is 190 , background board 50, cleaning cycle 30 minutes, within 3 hours and 30 minutes, a total of 12 tons of materials were selected, 3.43 tons of optional materials per hour, and 0.5 tons of waste were produced at the same time, with a crushing rate of 0.05%-0.1%. Efficiency 99%-99.5%. The obtained qualified 1899 PVA product is used for the bullet-proof glass film without stain and with ideal quality.

Embodiment 2

[0021] Add polyvinyl alcohol with a degree of polymerization of 500 and a degree of alcoholysis of 88% (mol / mol) into the hopper above the equipment, and adjust the equipment parameters as follows: air pressure is 0.25Mpa, feed rate is 50%, sensitivity is 200, background plate is 60, The cleaning period is 15 minutes. Within 3 hours, a total of 9 tons of materials can be selected, 3.0 tons of materials can be selected per hour, and 0.4 tons of waste materials are generated at the same time. The crushing rate is 0.1%, and the screening efficiency is 99.0%.

Embodiment 3

[0023] Add polyvinyl alcohol with a degree of polymerization of 2600 and a degree of alcoholysis of 100% (mol / mol) into the hopper above the equipment, and adjust the equipment parameters as follows: air pressure is 0.18Mpa, feed rate is 70%, sensitivity is 190, background plate is 50, The cleaning period is 35 minutes. Within 3 hours, a total of 12 tons of materials can be selected, 4.0 tons of materials can be selected per hour, and 0.45 tons of waste materials are generated at the same time. The crushing rate is 0.05%, and the screening efficiency is 98.8%.

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PUM

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Abstract

The invention discloses a method for removing colored particles in a polyvinyl alcohol product. A PVA (polyvinyl alcohol) product which contains the colored particles is added into a piece of color sorting equipment to sort; the alcoholysis degree of the PVA product is 80-100 percent in unit mol per mol, the degree of polymerization is 300-2600; and in the sorting process of the color sorting equipment, a control air pressure is 0.15-0.25 MPa, a feeding amount of the equipment is set to 30-70 percent, a background plate is set to 30-60, sensitivity is set to 150-200, a cleaning cycle is set to 15-60 minutes. According to the method, a screening efficiency is 95-99.5 percent; the percentage of damage of the qualified PVA product which is obtained by the color sorting method is 0.05-5 percent, and the PVA product of 1 ton at least can obtain the qualified PVA product of 0.95 ton; the appearance of the finally obtained PVA product is improved, the number of defects in the product is greatly reduced, and the method can be greatly used for production of the products, such as polyvinyl butyral (PVB). The PVA product which is obtained by the color sorting method is particularly suitable for industries, such as safe glass membranes, paper sizing agents and medical industry.

Description

technical field [0001] The invention relates to a sorting method for materials, in particular to a sorting method for polyvinyl alcohol (hereinafter referred to as PVA) granular products. Background technique [0002] In the production process of polyvinyl alcohol (PVA) products, due to various reasons such as long drying time of materials, uneven local heating, excessive drying, mechanical extrusion deformation, sticky belt of alcoholysis machine and "dead corner material" of equipment, etc., different hues may occur. Qualified PVA products. During the process design of this product, the colored particles in the PVA product were defined and required: Take 10Kg of PVA, count the number of foreign matter and colored PVA with an average particle size above 1mm (called the number of defects), and the number of defects When the number is less than 10, the PVA is qualified. It can be seen that the number of defects in PVA products is inevitable. These colored yellow, dark brow...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B07C5/342
Inventor 秦庆伟张仁文杨黎娜王东强
Owner CHINA PETROCHEMICAL CORP