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Thermal plastic processing available polyvinyl alcohol resin, as well as preparation method and application thereof

A polyvinyl alcohol resin, thermoplastic processing technology, applied in the field of polymer science, can solve the problems that affect the stable use of materials, high viscosity of ionic liquids, and uncommon ionic liquids, etc., achieve no yellowing, good thermal stability, and easy processing Excellent fluidity effect

Active Publication Date: 2017-06-13
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this patent involves too many types of additives and complex formulas. Although it has a certain effect on improving the thermoplastic processing performance of polyvinyl alcohol, the cost is high, it is not environmentally friendly, and the addition of too many additives sacrifices some of the inherent properties of polyvinyl alcohol.
In addition, the melting temperature of the thermoplastically processable resin obtained in this patent is 120-200°C, which causes the added water, alcohols and other small molecules to volatilize during processing, making it difficult to stably plasticize polyvinyl alcohol, and the products There will be bubbles in the middle, which is not conducive to obtaining products with uniform properties
In addition, due to the poor compatibility between additives and polyvinyl alcohol, phase separation results in the precipitation of small molecules during long-term use, which affects the stable use of materials; patent CN 103724637 proposes a method for preparing polyvinyl alcohol masterbatch, through Physically mix polyvinyl alcohol and ionic liquid directly, and then directly melt and extrude at 160-180°C through extrusion equipment
However, if polyvinyl alcohol is mixed directly with ionic liquid, due to the high viscosity of the ionic liquid, it is difficult for the ionic liquid to penetrate into the interior of the polyvinyl alcohol molecular chain uniformly, resulting in uneven plasticization. In addition, the ionic liquid involved in the patent is not Uncommon, which limits its industrial implementation

Method used

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  • Thermal plastic processing available polyvinyl alcohol resin, as well as preparation method and application thereof
  • Thermal plastic processing available polyvinyl alcohol resin, as well as preparation method and application thereof

Examples

Experimental program
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preparation example Construction

[0023] The preparation method of thermoplastically processable polyvinyl alcohol resin comprises the following steps: adding 15 to 45 parts of imidazole ionic liquid into an appropriate amount of water to fully dissolve and ionize according to the mass ratio, then adding 100 parts of polyvinyl alcohol and stirring evenly , place the mixture obtained by stirring evenly at 65-90° C. for plasticization for more than 1 hour, and then dry to remove the moisture in the mixture.

[0024] The inventor also found that the amount of imidazole ionic liquid added has a certain impact on product performance. When the amount of imidazole ionic liquid added is less (below 15 parts), the destruction of a large amount of hydrogen bonds in polyvinyl alcohol is limited, and thermoplastic processing Poor performance; when the amount of imidazole ionic liquid is added more (more than 50 parts), although the intramolecular and intermolecular hydrogen bonds in polyvinyl alcohol can be completely dest...

Embodiment 1

[0031] Dissolve 15 parts of imidazole ionic liquid in an appropriate amount of water to fully ionize, then add 100 parts of polyvinyl alcohol, stir evenly, plasticize the stirred mixture at 65°C for 2 hours, and then dry the water in the mixture, That is, a thermoplastically processable polyvinyl alcohol resin is obtained. The ionic liquid is 1-octyl-3-methylimidazolium tetrafluoroborate, the degree of polymerization of polyvinyl alcohol is 300, and the degree of alcoholysis is 80%.

[0032] The dried mixture is subjected to thermoplastic processing at 140°C, such as extrusion, injection molding, film blowing, spinning, foaming, and fused deposition molding.

[0033] The polyvinyl alcohol product obtained in this example has good transparency, no yellowing phenomenon, smooth surface, uniform and bubble-free inside, the tensile strength is 30MPa, and the electrical conductivity is 3.5×10 -4 S / cm.

Embodiment 2

[0035] Dissolve 20 parts of imidazole ionic liquid in an appropriate amount of water to fully ionize, then add 100 parts of polyvinyl alcohol, stir evenly, plasticize the stirred mixture at 70°C for 2 hours, and then dry the water in the mixture, That is, a thermoplastically processable polyvinyl alcohol resin is obtained. The ionic liquid is 1-octyl-3-methylimidazolium chloride, the degree of polymerization of polyvinyl alcohol is 500, and the degree of alcoholysis is 88%.

[0036] The dried mixture is subjected to thermoplastic processing at 130°C, such as extrusion, injection molding, film blowing, spinning, foaming, and fused deposition molding.

[0037] The polyvinyl alcohol product obtained in this example has good transparency, no yellowing phenomenon, smooth product surface, uniform and bubble-free inside. The tensile strength is 26MPa, and the electrical conductivity is 2.1×10 -3 S / cm.

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Abstract

The invention belongs to the field of high molecules, and particularly relates to thermal plastic processing available polyvinyl alcohol resin, as well as a preparation method and application thereof. To solve the technical problems, the method comprises the following steps: based on mass percentage, adding 15-45 parts of imidazole ionic liquid into water, sufficiently dissolving and ionizing; then, adding 100 parts of polyvinyl alcohol, uniformly mixing to obtain a mixture, and standing at 65-90 DEG C for plasticizing; and removing moisture. The thermal plastic processing available polyvinyl alcohol resin can be applied to the fields of thermal plastic processing, such as extrusion, injection molding, membrane blowing, spinning, foaming and fused deposition modeling. The preparation method is simple and efficient, has strong operability, and is easy for industrial implementation. Products prepared by adopting the polyvinyl alcohol resin as a raw material has excellent mechanical performance and excellent conductive performance.

Description

technical field [0001] The invention belongs to the field of polymer science, and in particular relates to a thermoplastically processable polyvinyl alcohol resin and a preparation method and application thereof. Background technique [0002] Polyvinyl alcohol is a polyhydroxy polymer with excellent performance, good water solubility, good adhesion, oil resistance, solvent resistance, gas barrier property, and wear resistance. As a non-toxic biodegradable material, polyvinyl alcohol is widely used in textile pulp, coatings, adhesives, emulsifiers, fibers, films, packaging, medicine and other industries. It plays an important role in the national economy and high-tech fields. play a very important role. However, due to the polyhydric structure of polyvinyl alcohol, a large number of intramolecular and intermolecular hydrogen bonds are formed, resulting in its melting point being close to the decomposition temperature, making it difficult to process thermoplastically, which g...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L29/04C08K5/3445
CPCC08K5/3445C08L29/04
Inventor 陈宁陈刚李莉王琪华正坤
Owner SICHUAN UNIV
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