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Preparation method and application of carboxylated graphene/chitosan composite coating agent

A technology of carboxylated graphene and chitosan, which is applied in the direction of chitin polysaccharide coating, application, coating, etc., can solve the problem of no adsorption effect of formaldehyde

Active Publication Date: 2021-03-30
XINGYE LEATHER TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The embodiment of the present application provides a method for preparing a carboxylated graphene / chitosan composite coating agent and its application, which solves the problem that the coating agent for leather products in the prior art has no effect of adsorbing formaldehyde or has a poor adsorption effect. Technical problem, realize the formaldehyde removal rate of the composite finishing agent ≥ 95%, and at the same time use the composite finishing agent in the finishing process of leather making, the obtained finished leather is ≤ 20ppm, which meets the use standards of most industries

Method used

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  • Preparation method and application of carboxylated graphene/chitosan composite coating agent
  • Preparation method and application of carboxylated graphene/chitosan composite coating agent

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Embodiment 1

[0034] A kind of preparation method of carboxylated graphene / chitosan composite finishing agent, comprises the steps:

[0035] Step 1: prepare carboxylated graphene powder

[0036] Add 1 part of graphene oxide to 1000 parts of deionized water, ultrasonically disperse for 60 minutes, then add 10 parts of sodium hydroxide, ultrasonically disperse for 30 minutes, then add 20 parts of α-bromoacetic acid, ultrasonically disperse for 30 minutes, and finally adjust the reaction temperature To 30°C, react for 6 hours to obtain carboxylated graphene dispersion, wash the obtained product with acetic acid and deionized water alternately for 6 times, and finally wash with absolute ethanol for 3 times, and dry the product in vacuum to obtain carboxylated graphene olefin powder;

[0037] Step 2: prepare chitosan solution

[0038] 5 parts of acetic acid are dissolved in 100 parts of deionized water, then 2.5 parts of chitosan are added to adjust the pH value of the solution to 3.5 to obtai...

Embodiment 2

[0044] A kind of finished leather, comprising applying the carboxylated graphene / chitosan composite finishing agent to the tanning finishing section, adjusting the solid content of the carboxylated graphene / chitosan finishing agent to 5%, adopting the finishing method of spraying, coating The coating amount is 20g / sf2; the finishing operation process is as follows: semi-finished leather to be coated → spraying the upper layer of finishing agent → ironing → standing → oscillating and softening → ironing → finished leather, wherein the ironing temperature is 130 ° C, the pressure It is 30kgf, and the strength of vibration pulling is 6.

[0045] The finished product that present embodiment 1 obtains obtains experimental data as shown in table 1 through experimental testing, and the finished leather that embodiment 2 obtains obtains experimental data as shown in table 2 through experimental testing:

[0046]

[0047] Table 1

[0048]

[0049] Table 2

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Abstract

The invention discloses a preparation method and application of a carboxylated graphene / chitosan composite coating agent. The preparation method comprises the following steps: step 1, preparing carboxylated graphene powder; 2, preparing a chitosan solution; 3, taking the carboxylated graphene powder, and mixing the carboxylated graphene powder with water to obtain a carboxylated graphene solution;4, preparing a carboxylated graphene / chitosan composite coating agent: adding 1-10 parts of a carboxylated graphene solution into 1000 parts of a chitosan solution, uniformly mixing, then adding 1-5parts of an activating agent, reacting for a period of time, then adding 1-5 parts of a cross-linking agent, reacting for a period of time, and finally adding 0-3 parts of a nano metal material to prepare the carboxylated graphene / chitosan composite coating agent. According to the invention, formaldehyde scavenging rate of the composite finishing agent is larger than or equal to 95%, meanwhile, the composite finishing agent is applied to the finishing procedure of leather making, the content of obtained finished leather is smaller than or equal to 20 ppm, which satisfy the use standards of most industries.

Description

technical field [0001] The invention relates to the technical fields of tanning chemistry and tanning engineering, in particular to a preparation method and application of a carboxylated graphene / chitosan composite coating agent. Background technique [0002] In the process of leather processing and manufacturing, chemicals such as modified aldehydes, oxazolidines, amino resins, organic phosphines, and modified proteins are synthesized with formaldehyde as a precursor. The chemicals contain a certain amount of formaldehyde. Tanning, retanning, filling, finishing, etc. are carried into the finished leather and will be slowly released during long-term use. In recent years, green consumption has gradually become a consumption trend at home and abroad. There are strict restrictions on formaldehyde control. The European Union clearly stipulates in the "EU Chemicals Registration, Evaluation, Authorization and Restriction Regulations" that the formaldehyde content of leather and it...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D105/08C09D7/62C09D7/61C08B37/08C14C11/00
CPCC09D105/08C09D7/62C09D7/61C08B37/003C14C11/00C08K2201/011C08K2003/2241C08K9/04C08K3/042C08K3/22
Inventor 姚庆达梁永贤王小卓温会涛周华龙但卫华
Owner XINGYE LEATHER TECH CO LTD
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