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Method using centrifugal extraction to prepare gradient film modified by single epoxy terminated polysiloxane

A polysiloxane and single epoxy sealing technology is applied in the field of preparing single epoxy terminated polysiloxane modified gelatin gradient film by centrifugal extraction method, which can solve the problems affecting film structure, film performance and film application, plastic feeling strong, water resistance and poor corrosion resistance, etc., to achieve the effect of superior performance, low surface tension and good weather resistance

Active Publication Date: 2016-05-11
QILU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Gelatin has become an important raw material for the preparation of protein films. Like other natural polymer materials, this type of protein material has problems such as strong plastic feeling, poor water resistance and corrosion resistance after forming a film.
Siloxane-modified gelatin can improve the water resistance and flexibility of gelatin film to a certain extent [201310012009.X], but the disordered distribution of siloxane components in the film directly affects the film structure, film performance and film application

Method used

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  • Method using centrifugal extraction to prepare gradient film modified by single epoxy terminated polysiloxane
  • Method using centrifugal extraction to prepare gradient film modified by single epoxy terminated polysiloxane
  • Method using centrifugal extraction to prepare gradient film modified by single epoxy terminated polysiloxane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Add 0.3g of surfactant and 95g of deionized water into a three-neck reaction flask equipped with a thermometer socket, a sampling port, and a condenser socket, stir and heat to 50°C, and after the surfactant is completely dissolved, add 0.65mL of 2 mol / L sodium hydroxide, adjust the reaction pH to be 10.0, add 5g gelatin (accounting for 5% of the total solution mass), continue to stir until the gelatin is completely dissolved, and then add monoepoxy-terminated polysiloxane (Mw=500) continuously or in batches ), the consumption of single epoxy-terminated polysiloxane is 0.8 times of the primary amino molar weight in the gelatin molecule, the reaction starts, the primary amino content in the reaction system no longer changes in 24 hours, stops stirring and heating, obtains single Epoxy-terminated polysiloxane modified gelatin solution. Centrifuge the mono-epoxy-terminated polysiloxane-modified gelatin solution at low temperature at a speed of 10,000 r / min for 20 minutes, ...

Embodiment 2

[0030] The described method is consistent with Example 1, the only difference is that the rotating speed is 8000r / min, and the time is 20min.

[0031] Mix the white product and deionized water evenly at a mass ratio of 1:1, then mix evenly at a ratio of 3:1 between the mixed liquid and ethanol, measure 0.5ml of the mixed solution and add it dropwise to the polytetrafluoroethylene substrate First, freeze it with liquid nitrogen, and then dry it with a freezer to obtain a modified gelatin film. The contact angle test shows that the contact angle of the raw gelatin film is 72 o , the contact angle of the modified gelatin film increased to 95 o , indicating that the hydrophobicity of the modified gelatin film is improved; the differential calorimetry thermal scanner test shows that the Tg of the raw gelatin film is 223 ° C, and the modified gelatin film has two Tgs, 125 ° C and 225 ° C, respectively, indicating that the modification The gelatin film has a microphase separation s...

Embodiment 3

[0033] The described method is consistent with Example 1, the only difference is that the rotating speed is 5000r / min, and the time is 20min.

[0034] Mix the white product and deionized water evenly at a mass ratio of 1:1, then mix evenly at a ratio of 3:1 between the mixed liquid and ethanol, measure 0.5ml of the mixed solution and add it dropwise to the polytetrafluoroethylene substrate First, freeze it with liquid nitrogen, and then dry it with a freezer to obtain a modified gelatin film. The contact angle test shows that the contact angle of the raw gelatin film is 72 o , the contact angle of the modified gelatin film increased to 90 o , indicating that the hydrophobicity of the modified gelatin film is improved; the differential calorimetry thermal scanner test shows that the Tg of the raw gelatin film is 223 ° C, and the modified gelatin film has two Tgs, 155 ° C and 212 ° C, respectively, indicating that the modification The gelatin film has a microphase separation s...

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Abstract

The invention relates to a method using centrifugal extraction to prepare a gradient film modified by single epoxy terminated polysiloxane. The method includes: dissolving surfactant sodium alkyl sulfate into water to prepare an aqueous solution, stirring for 1-2 hours under the condition that the temperature is 40-60 DEG C and pH is 8-11, adding gelatin, stirring for 4-8 hours, and adding single epoxy terminated polydimethylsiloxane with the molecular weight being 500 to obtain a gelatin solution modified by the single epoxy terminated polydimethylsiloxane; centrifuging the gelatin solution at low temperature, adjusting centrifuging speed and time, adding ethanol, well mixing, dripping 0.5-0.8ml of the mixture on a gelatin substrate, standing for 12-18 hours, and drying in an oven of 40-50 DEG C to obtain the gradient film, wherein the volume ratio of the ethanol to reaction liquid is (3-5):1. The gradient film is high in hydrophobic performance, high in tensile strength, soft and the like.

Description

technical field [0001] The invention relates to a gradient film, in particular to a centrifugal extraction method for preparing a single epoxy-terminated polysiloxane modified gelatin gradient film. This kind of gradient film has the characteristics of gradient change of component concentration in the longitudinal section, high tensile strength, good hydrophobicity and softness of the film, and is especially suitable as a finishing agent for leather bag leather, garment leather or car decoration leather. Background technique [0002] Gelatin is obtained from cheap tanning, pharmaceutical and food by-products or waste. It is a renewable resource, biodegradable, and has no pollution to the environment. Gelatin has become an important raw material for the preparation of protein films. Like other natural polymer materials, this type of protein material has problems such as strong plastic feeling, poor water resistance and corrosion resistance after film formation. Siloxane-modi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/18C08G81/00
CPCC08G81/00C08J5/18C08J2387/00
Inventor 许静李静李天铎班青
Owner QILU UNIV OF TECH
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