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Water soluble polyvinyl alcohol foam and preparation method thereof

A technology for polyvinyl alcohol and polyvinyl alcohol powder, applied in the field of water-soluble polyvinyl alcohol foam and its preparation, can solve the problems of narrow foam molding process window, increased product density, unfavorable long-term use stability of products, etc. Reduced water solubility, high closed cell rate, and controllable cell diameter

Active Publication Date: 2017-11-17
YONGAN SYF WATER SOLUBLE FILMS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of the currently disclosed methods use substances such as water and glycerin to plasticize PVA. These plasticizing substances remain in the final foam product and may be separated out during use, which is not conducive to the long-term use stability of the product; in addition, for PVA The control of cell size and structure depends on the addition of nucleating agents such as calcium carbonate, resulting in an increase in the density of the product, and at the same time, the molding process window of the foam is narrow

Method used

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  • Water soluble polyvinyl alcohol foam and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The relatively low molecular weight polyvinyl alcohol powder and the relatively high molecular weight polyvinyl alcohol powder of the specifications shown in Table 1 were vacuum-dried to a water content lower than 40ppm respectively; Add 1 kg of high-molecular-weight polyvinyl alcohol powder into a high-speed mixer, stir for 25 seconds at a speed of 10,000 r / min, and repeat this dry mixing process twice; In the high-pressure foaming kettle, evacuate until the pressure in the kettle is ≤0.01MPa, remove excess air and moisture, and then inject carbon dioxide gas and 10 grams of ethane in sequence; first raise the temperature in the foaming kettle to 200°C, and then pressurize to 13MPa, keep constant temperature and constant pressure for 60 minutes, then slowly and uniformly cool down to 160°C within 20 minutes, and then pressurize to 13MPa, keep constant temperature and constant pressure for 60 minutes; quickly reduce the pressure in the foaming tank within 30 seconds At ...

Embodiment 2

[0036] The relatively low molecular weight polyvinyl alcohol powder and the relatively high molecular weight polyvinyl alcohol powder of specifications shown in Table 1 are vacuum-dried to a water content lower than 40ppm respectively; Add 1 kg of high-molecular-weight polyvinyl alcohol powder into a high-speed mixer, stir for 15 seconds at a speed of 20,000 r / min, and repeat this dry mixing process 3 times; In the high-pressure foaming kettle, vacuumize until the pressure in the kettle is ≤0.01MPa, remove excess air and moisture, and then inject carbon dioxide gas; first raise the temperature in the foaming kettle to 180°C, and then pressurize to 7MPa, constant temperature and constant pressure Keep it for 120 minutes, then slowly and uniformly cool down to 140°C within 10 minutes, then pressurize to 7MPa, keep constant temperature and pressure for 30 minutes; quickly reduce the pressure in the foaming tank to normal pressure (0.1MPa) within 10 seconds 1. The temperature is q...

Embodiment 3

[0038] The relatively low molecular weight polyvinyl alcohol powder and the relatively high molecular weight polyvinyl alcohol powder of specifications shown in Table 1 are vacuum-dried to a water content lower than 40ppm respectively; Add 1 kg of high-molecular-weight polyvinyl alcohol powder into a high-speed mixer, stir for 5 seconds at a speed of 30,000 r / min, and repeat this dry mixing process 4 times; In the high-pressure foaming kettle, vacuumize until the pressure in the kettle is ≤0.01MPa, remove excess air and moisture, and then inject carbon dioxide gas; first raise the temperature in the foaming kettle to 190°C, and then pressurize to 10MPa, constant temperature and constant pressure Hold for 90 minutes, then slowly and uniformly cool down to 150°C within 15 minutes, then pressurize to 10MPa, keep constant temperature and pressure for 45 minutes; quickly reduce the pressure in the foaming tank to normal pressure (0.1MPa) within 20 seconds 1. The temperature is rapi...

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Abstract

The invention discloses a water soluble polyvinyl alcohol foam and a preparation method thereof. The water soluble polyvinyl alcohol foam comprises relative low molecular weight polyvinyl alcohol with a polymerization degree of 1300-1700 and relative high molecular weight polyvinyl alcohol with a polymerization degree of 3500-6500; and the weight ratio of the two components is determined by a formula: (DPH / DPL)1.4=<WL / WH=<(DPH / DPL)1.8. The water soluble polyvinyl alcohol foam is prepared by the following steps: mixing polyvinyl alcohol with different polymerization degrees according to a specific ratio, and then subjecting the mixture to a series of processes in carbon dioxide with a specific temperature and pressure range; and the structure and performance of the water soluble polyvinyl alcohol foam are excellent. In a conventional technology, a large amount of non-polyvinyl alcohol substances is added, the water solubility is reduced, the performance becomes unstable, and polyvinyl alcohol easily precipitates during the using process, the provided method solved the abovementioned problems; moreover, the formula and technology are simple and are easy to operate, and the method has a good application prospect therefore.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and relates to a water-soluble polyvinyl alcohol foam and a preparation method thereof. Background technique [0002] Polyvinyl alcohol (PVA) is one of the largest water-soluble polymer materials currently produced, with good mechanical properties, physical adsorption, resistance to organic solvents, biocompatibility, biodegradability, and environmental friendliness. It is widely used in papermaking, textile, filtration, adsorption, medical and sanitation, daily necessities and other fields. my country is the main producer and consumer of PVA raw materials and products in the world. Using PVA as raw material to develop high-tech products such as chemical fibers, films, and foams is of great significance for promoting the development of the PVA industry and increasing the added value of products. [0003] As we all know, the molecular structure of PVA contains abundant hydroxyl groups, ...

Claims

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Application Information

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IPC IPC(8): C08L25/06C08J9/12C08J9/14
Inventor 苏哲
Owner YONGAN SYF WATER SOLUBLE FILMS
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