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Polyvinyl alcohol-thymolphthalein acetal and preparation method and application thereof

A polyvinyl alcohol shrinkage and polyvinyl alcohol technology, which is applied in the field of polyvinyl thymol phthalein and its preparation, can solve problems such as uncontrollable color development, achieve reduced hydroxyl density, good water resistance, and reduce dissolution sexual effect

Inactive Publication Date: 2018-04-06
SHANXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Another object of the present invention is to provide a color-changing material containing polyvinyl thymol phthalein and its preparation method, so as to make up for the lack of controllable color development of existing materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Synthesis of Polyvinyl Thymol Phthalaldehyde

[0033] Weigh 2mmol thymolphthalein and 4mmol urotropine, and mix them into a 100mL round bottom flask. Under the condition of ice bath, 0.15 mol trifluoroacetic acid (TFA) was added, the solution was stirred for 30 min and then warmed up to room temperature. Continue heating to 72°C and reflux for 24h. After the reaction stops, excess TFA is removed by a rotary evaporator. Add 30mL H 2 O, the mixed solution was heated to 60°C, stirred for 30 min and then filtered to obtain a solid. The solid was further separated by column chromatography, using petroleum ether and dichloromethane at a ratio of 1:3 (v / v) as a developer, and finally dried by rotary evaporation to obtain a light yellow powder.

[0034] Add 1g of polyvinyl alcohol (PVA-1788) into 20mL of secondary water, soak for 12 hours, stir and dissolve at 95°C. After the polyvinyl alcohol is completely dissolved, cool down to 85°C, add 1mL of thymolphthalein aldehyde e...

Embodiment 2

[0038] Synthesis of Polyvinyl Thymol Phthalaldehyde

[0039] Weigh 2mmol thymolphthalein and 6mmol urotropine, and mix them into a 100mL round bottom flask. Under ice-bath conditions, 0.20 mol of trifluoroacetic acid (TFA) was added, the solution was stirred for 30 min and then warmed to room temperature. Continue heating to 72°C and reflux for 24h. After the reaction stops, excess TFA is removed by a rotary evaporator. Add 60mL H 2 O, the mixed solution was heated to 60°C, stirred for 30 min and then filtered to obtain a solid. The solid was further separated by column chromatography, using petroleum ether and dichloromethane at a ratio of 1:3 (v / v) as a developer, and finally dried by rotary evaporation to obtain a light yellow powder.

[0040] Add 1g of polyvinyl alcohol (PVA-1788) into 20mL of secondary water, soak for 12 hours, stir and dissolve at 95°C. After the polyvinyl alcohol is completely dissolved, cool down to 85°C, add 1mL of thymolphthalein aldehyde ethanol...

Embodiment 3

[0044] Synthesis of Polyvinyl Thymol Phthalaldehyde

[0045] Weigh 2mmol thymolphthalein and 5mmol urotropine, mix them into a 100mL round bottom flask. Under ice-bath conditions, 0.20 mol of trifluoroacetic acid (TFA) was added, the solution was stirred for 30 min and then warmed to room temperature. Continue heating to 72°C and reflux for 24h. After the reaction stops, excess TFA is removed by a rotary evaporator. Add 40mL H 2 O, the mixed solution was heated to 60°C, stirred for 30 min and then filtered to obtain a solid. The solid was further separated by column chromatography, using petroleum ether and dichloromethane at a ratio of 1:3 (v / v) as a developer, and finally dried by rotary evaporation to obtain a light yellow powder.

[0046] Add 1g of polyvinyl alcohol (PVA-1788) into 20mL of secondary water, soak for 12 hours, stir and dissolve at 95°C. After the polyvinyl alcohol is completely dissolved, cool down to 85°C, add 1mL of thymolphthalein aldehyde ethanol sol...

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Abstract

The invention provides polyvinyl alcohol-thymolphthalein acetal and a preparation method and application thereof. The preparation method of the polyvinyl alcohol-thymolphthalein acetal comprises the steps of: firstly, synthesizing thymol phthalaldehyde based on a discoloration principle of thymolphthalein, and performing an aldolization reaction on polyvinyl alcohol and thymol phthalaldehyde to form the stably combined polyvinyl alcohol-thymolphthalein acetal compound; on the basis of the compound, a discoloration material is prepared by using the following formula of: 20-40 parts of polyvinylalcohol, 0.5-8 part s of plasticizer, 0.1-1 part of surfactant, 8-10 parts of polyvinyl alcohol-thymolphthalein acetal, 0.5-2 parts of silicone oil and 40-60 parts of water. The synthesized discoloration material has the advantages that the discoloration material turns blue when meeting with a small amount of alkali, and fades when meeting with water.

Description

technical field [0001] The invention relates to polymer materials, in particular to polyvinyl thymol phthalein and its preparation method and application. Background technique [0002] Polyvinyl alcohol is a widely used water-soluble polymer with low price. It is characterized by good compactness and high crystallinity. It has unique strong adhesion, smoothness, oil resistance, solvent resistance, and protective colloid. properties, gas barrier properties, abrasion resistance and water resistance through special treatment. Moreover, polyvinyl alcohol is the only vinyl polymer that can be used by bacteria as a carbon source and energy source. It is a biodegradable polymer material that is non-toxic, tasteless, and harmless to the human body, and has good affinity with the natural environment. , no accumulation, no pollution, has unique advantages in plastic products. [0003] However, there are few reports on a color-changing polyvinyl alcohol material in the market at pres...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F16/06C08F8/28C08L29/04C08L29/14C08L83/04C08J5/18C07D307/83C09K9/02
CPCC07D307/83C08F8/28C08J5/18C08J2329/04C08J2429/14C08L29/04C08L2205/02C08L2205/03C09K9/02C09K2211/145C08F16/06C08L29/14C08L83/04
Inventor 范珍珍侯玲杰孔祥宇丁媛媛郭谨昌杨振华张月霞董川双少敏
Owner SHANXI UNIV
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