Polyvinyl alcohol capable of being subjected to melting processing modification, and preparation method thereof

A technology of polyvinyl alcohol and melt processing, which is applied in the field of modified polyvinyl alcohol and its preparation, can solve the problems of reduced regularity of molecular chains of modified polyvinyl alcohol, reduced crystallization ability, and small melt index, etc., and achieves good mechanical properties , Improve fluidity, increase the effect of melt index

Active Publication Date: 2017-06-16
SINOPEC SICHUAN VINYLON FACTORY +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Patent CN102603954A uses long-chain branched vinyl carboxylate and vinyl acetate for copolymerization, and the regularity of the molecular chain of the modified polyvinyl alcohol is reduced, the crystallization ability is reduced, and the melting point is reduced, but the melt index is found to be too high in practical applications. Small, difficult to melt process effectively

Method used

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  • Polyvinyl alcohol capable of being subjected to melting processing modification, and preparation method thereof
  • Polyvinyl alcohol capable of being subjected to melting processing modification, and preparation method thereof
  • Polyvinyl alcohol capable of being subjected to melting processing modification, and preparation method thereof

Examples

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Effect test

Embodiment 1

[0038] Add 200g of vinyl acetate and 40g of vinyl decanoate into 160g of methanol solution in which 0.24g of azobisisobutyronitrile is dissolved, stir and mix evenly, then react in a water bath at 65°C for 5h, raise the temperature to 75°C, Add 50g of methanol once to blow off, the number and time of adding methanol are determined according to the actual situation, and blow off for 3h to end the reaction.

[0039] Take 200g of the above solution, and add 550g of methanol to make the concentration of modified vinyl acetate reach 10%, then add 0.09g of sodium hydroxide to react at 45°C, break up after gelation, and react for a total of 45min. The product is washed with methanol and filtered. The thermoplastic processability modified polyvinyl alcohol can be obtained by vacuum drying at 60°C.

[0040] The proton nuclear magnetic resonance spectrum figure of the modified polyvinyl alcohol prepared in embodiment 1 is shown in figure 1 , it can be proved by this figure that long-ch...

Embodiment 2

[0044]Add 200g of vinyl acetate and 32g of vinyl nonanoate into 160g of methanol solution in which 0.24g of azobisisobutyronitrile is dissolved, stir and mix evenly, then react in a water bath at 45°C for 5h, raise the temperature to 75°C, and Add 50g of methanol once to blow off, the number and time of adding methanol are determined according to the actual situation, and blow off for 4h to end the reaction.

[0045] Take 200g of the above solution, and add 510g of methanol to make the concentration of modified vinyl acetate reach 12%, then add 0.09g of sodium hydroxide to react at 45°C, break up the gel, react for a total of 52min, wash and filter the product with methanol, and The thermoplastic processability modified polyvinyl alcohol can be obtained by vacuum drying at 60°C.

[0046] The melting point of the modified polyvinyl alcohol is 187°C, the decomposition temperature is 266°C, the degree of polymerization is 710, the degree of alcoholysis is 88%, and the melt index ...

Embodiment 3

[0049] Add 200g of vinyl acetate and 22g of vinyl decanoate into 117g of an ethanol solution in which 0.13g of azobisisoheptanonitrile is dissolved, stir and mix evenly, then react in a water bath at 65°C for 5h, raise the temperature to 75°C, and Add 50g of ethanol once to blow off, the number and time of adding methanol are determined according to the actual situation, and blow off for 3h to end the reaction.

[0050] Take 200g of the above solution, and add 532g of ethanol to make the concentration of modified vinyl acetate reach 10%, then add 0.10g of potassium hydroxide to react at 45°C, break up the gel, react for a total of 56min, wash and filter the product with ethanol, and The thermoplastic processability modified polyvinyl alcohol can be obtained by vacuum drying at 60°C.

[0051] The melting point of the modified polyvinyl alcohol is 192°C, the decomposition temperature is 290°C, the degree of polymerization is 960, the degree of alcoholysis is 91%, and the melt in...

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Abstract

The invention discloses polyvinyl alcohol capable of being subjected to melting processing modification, wherein the modified polyvinyl alcohol is a random copolymer and has the following structure general formula defined in the specification, R1, R2 and R3 are alkyl substituents, at least one of the substituents is methyl, the sum of the carbon atoms in R1, R2 and R3 is 7-9, x is more than 1, y is more than 1, z is more than 1, a molar ratio of x to y to z is (81-93):(4-12):(2-8), the polymerization degree is 500-1000, the melting temperature is 180-220 DEG C, the decomposition temperature is 260-290 DEG C, the melt index MI is 1.0-5.0 g/10 min (10 kg 210 DEG C), the tensile strength is 80-110 MPa, the elongation at break is 20-40%, and the notch impact strength is 6-10 KJ/m<2>. The invention further discloses a preparation method of the modified polyvinyl alcohol, wherein the preparation method has characteristics of easily available raw materials and simple operation, and is suitable for industrial production.

Description

technical field [0001] The invention relates to modified polyvinyl alcohol and a preparation method thereof, in particular to a melt-processable modified polyvinyl alcohol and a preparation method thereof. Background technique [0002] Polyvinyl alcohol is a water-based polymer material with a wide range of uses. Due to a large number of hydroxyl groups, it has excellent water solubility, mechanical properties, gas barrier properties, good film-forming properties, and adhesiveness, and polyvinyl alcohol is non-toxic. It can be biodegraded under certain conditions, and has a wide range of applications in textile, food, medicine, construction, wood processing, papermaking and other industries. However, the presence of a large number of hydroxyl groups in the molecular chain of polyvinyl alcohol makes it easy to form intramolecular and intermolecular hydrogen bonds, making its melting point as high as 220-230°C, while polyvinyl alcohol begins to degrade at 180°C, making it diff...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F218/08C08F218/10C08F8/12
Inventor 陈宁何灵芝胡继锋胡腊梅王琪
Owner SINOPEC SICHUAN VINYLON FACTORY
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