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Collagen adhesive and preparation method and application thereof

A collagen and adhesive technology, applied in the direction of protein waste adhesives, adhesive additives, non-polymer adhesive additives, etc., to achieve the effects of extending the application period, slowing down the reaction rate, and good environmental friendliness

Inactive Publication Date: 2017-05-31
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] As we all know, my country is a big country in tanning industry, but the traditional tanning industry salt-wet hide can only produce finished leather accounting for 20% of the raw hide, and will produce solid waste of more than 60% of the raw hide

Method used

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  • Collagen adhesive and preparation method and application thereof
  • Collagen adhesive and preparation method and application thereof
  • Collagen adhesive and preparation method and application thereof

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preparation example Construction

[0028] The preparation method of the collagen type adhesive involved in the present invention not only does not cause the harm of releasing free formaldehyde, but also effectively and rationally utilizes leather solid waste and realizes its high-value conversion. Material material, green and environmentally friendly, easy to biodegrade. The synthetic route is as follows:

[0029]

[0030] Wherein, reaction formula (1) is the process of sulfite blocked isocyanate group; Reaction formula

[0031] (2) It is the process of cross-linking reaction between blocked isocyanate group and amino group in gelatin,

[0032]

[0033] Specifically include the following steps:

[0034] Step 1: Preparation of gelatin aqueous solution:

[0035] Weigh 10g to 15g of gelatin, add it to deionized water, swell at room temperature for 30min, and then heat to 60°C until the gelatin is completely dissolved. After the gelatin is dissolved, add 30% of the dry weight of gelatin to sodium chloride ...

Embodiment 1

[0045] A preparation method of collagen-based wood adhesive, comprising the steps of:

[0046] Step 1: Weigh 10g of gelatin, add 100mL of deionized water, swell at room temperature for 30min, then heat to 60°C, after the gelatin is completely dissolved, add 3g of sodium chloride to obtain a gelatin aqueous solution;

[0047] Step 2: Weigh 25 g of polyisophorone diisocyanate, add 0.4% of its mass of sodium bisulfite, and stir at room temperature for 30 minutes to obtain blocked polydiphenylmethane diisocyanate;

[0048] Step 3: Add blocked polydiphenylmethane diisocyanate with 10% gelatin mass to the aqueous gelatin solution, and stir evenly at room temperature for 1 hour to obtain a gelatin solution modified with blocked isocyanate groups;

[0049] Step 4: Apply the synthetic collagen adhesive evenly on both sides of the pine veneer (the amount of double-sided glue is 300g / m 2 ), hot pressing at 120°C and 1.0Mpa for 6 minutes after embryo formation, take 3 groups of samples, ...

Embodiment 2

[0051] A preparation method of collagen-based wood adhesive, comprising the steps of:

[0052] Step 1: Weigh 10g of gelatin, add 100mL of deionized water, swell at room temperature for 30min, then heat to 60°C, after the gelatin is completely dissolved, add 3g of sodium chloride to obtain a gelatin aqueous solution;

[0053] Step 2: Weigh 25 g of polyphenyl polymethyl polyisocyanate, add 0.5% of its mass of sodium bisulfite, and stir at room temperature for 30 minutes to obtain blocked polyphenyl polymethyl polyisocyanate;

[0054] Step 3: Adding blocked polyphenyl polymethyl polyisocyanate with 15% gelatin mass to the aqueous gelatin solution, and uniformly stirring at room temperature for 1 hour to obtain a blocked isocyanate group-modified gelatin solution;

[0055] Step 4: Apply the synthetic collagen adhesive evenly on both sides of the pine veneer (the amount of double-sided glue is 300g / m 2 ), hot pressing at 120°C and 1.0Mpa for 6 minutes after embryo formation, take ...

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Abstract

The invention relates to a collagen adhesive and a preparation method and an application thereof. The preparation method comprises the following steps: adding gelatin originated from waste leather into deionized water to swell, heating the mixture till the gelatin is fully dissolved, and adding sodium chloride to obtain a gelatin aqueous solution; adding a sealing agent into a polyisocyanate compound, and stirring the mixture at room temperature to obtain the closed polyisocyanate compound; and then adding the closed polyisocyanate compound into the gelatin aqueous solution and stirring the mixture at normal temperature to obtain the collagen adhesive for wood adhesion. The collagen adhesive provided by the invention not only can efficiently utilize the leather waste solids, but also has the advantages of excellent performance and environment friendliness.

Description

technical field [0001] The invention relates to the technical field of fine chemicals, in particular to a collagen-based adhesive and its preparation method and application. Background technique [0002] Protein adhesives have excellent properties and good adhesive strength, and their adhesive strength to wood can reach 2.378 MPa, which has reached the adhesive strength requirements of type II plywood, and it is selected from waste leather. Collagen is used as a raw material, which is easy to biodegrade and mild to the human body. Compared with the currently used "trialdehyde glue", it has no formaldehyde release and no pollution to the environment. Therefore, the synthesis and performance of protein adhesives have been studied in recent years. has received widespread attention. [0003] As we all know, my country is a big country in the tanning industry, but the traditional tanning industry salt-wet hide can only produce about 20% of the finished leather of the raw hide, a...

Claims

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Application Information

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IPC IPC(8): C09J189/06C09J11/06
CPCC09J189/06C08K5/29C08K5/41C09J11/06
Inventor 王学川李妍任龙芳强涛涛
Owner SHAANXI UNIV OF SCI & TECH
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