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Polydopamine propenoic acid-based polyurethane adhesive and preparation method thereof

A polydopamine propylene-based polyurethane and acrylic-based polyurethane technology, which is applied in the field of material science, can solve problems such as poor adhesive mechanical properties of adhesives, and achieve the effects of high reaction efficiency, wide application prospects, and green environmental protection.

Active Publication Date: 2019-10-11
SHAANXI UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention provides a polydopamine acrylic-based polyurethane (PDMAPU) adhesive and a preparation method thereof, which is to introduce dopamine into the water-based polyurethane chain through binary random homopolymerization under thermal triggering, so as to overcome the adhesiveness of the water-based polyurethane The problem of poor adhesive mechanical properties

Method used

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  • Polydopamine propenoic acid-based polyurethane adhesive and preparation method thereof
  • Polydopamine propenoic acid-based polyurethane adhesive and preparation method thereof
  • Polydopamine propenoic acid-based polyurethane adhesive and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A preparation method of PDMAPU adhesive includes the following steps:

[0032] Step 1. Preparation of PPU

[0033] Add 25mmol of isophorone diisocyanate, 6.25mmol of polytetrahydrofuran ether (PTMG2000), 0.095mmol of dibutyltin dilaurate, and 4mmol of small molecule chain extender 1,4-butanediol into a stirrer, glass In a three-necked flask with a stopper, mix evenly, use a heat-collecting thermostatic heating magnetic stirrer to heat (oil bath), first react at 50°C for 30 minutes, then heat to 70°C for 1 hour, and then add 6.73mmol of carboxylic acid type hydrophilic Chain extender 2,2-bis(hydroxymethyl)propionic acid, chain extension reaction at 80℃ for 2.5h to obtain PPU;

[0034] Step 2. Preparation of HEA-PPU

[0035] Add 16mmol of hydroxyethyl acrylate (HEA) to 8mmol of PPU synthesized in step 1 for end-capping, and react at 70°C for 3h to obtain HEA-PPU;

[0036] Step 3: Preparation of PDMAPU adhesive

[0037] Take 2.67mmol of DMA dispersed in 10ml of acetone, and then ad...

Embodiment 2

[0039] A polydopamine propylene-based polyurethane adhesive and a preparation method thereof, including the following steps:

[0040] Step 1. Preparation of PPU

[0041] The preparation method is exactly the same as in Example 1;

[0042] Step 2. Preparation of HEA-PPU

[0043] Add 16 mmol methyl methacrylate to 8 mmol of the PPU synthesized in step 1 for end-capping, and react at 75°C for 2 hours to obtain HEA-PPU;

[0044] Step 3. Preparation of PDMAPU emulsion

[0045] Disperse 2.0mmol DMA in 10ml of acetone, then add it to the HEA-PPU prepared in step 2 with the molar ratio of DMA and the acrylic group in HEA-PPU of 1:8, and then add 0.25mmol of AIBN , Bubbling in argon gas for 35 minutes, stirring in an oil bath at 70°C for 3 hours to carry out the random double bond homopolymerization reaction between propenyl and methacrylamide groups, and finally neutralizing the product with triethylamine Salt is formed, then the acetone in the product is removed, and 31 g of deionized water i...

Embodiment 3

[0047] A polydopamine propylene-based polyurethane adhesive and a preparation method thereof, including the following steps:

[0048] Step 1. Preparation of PPU

[0049] The preparation method is exactly the same as in Example 1;

[0050] Step 2. Preparation of HEA-PPU

[0051] Add 16 mmol of 2-hydroxypropyl methacrylate to 8 mmol of the PPU synthesized in step 1 for end-capping, and react at 75°C for 2.5 h to obtain HEA-PPU;

[0052] Step 3. Preparation of PDMAPU emulsion

[0053] Take 1.6mmol of DMA dispersed in 10ml of acetone, and then add it to the HEA-PPU prepared in step 1 with the molar ratio of DMA and the acrylic group in HEA-PPU of 1:10, and then add 0.15mmol of AMBN , Bubbling in argon gas for 45 minutes, stirring in an oil bath at 75 ℃ and reacting for 2 hours to carry out the homopolymerization reaction of random double bonds between acrylic groups and methacrylamide groups, and finally neutralize the product with triethylamine Salt is formed, then the acetone in the prod...

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Abstract

The invention discloses a preparation method of a polydopamine propylene-based polyurethane adhesive. The method comprises the following steps of using a polyurethane prepolymer and a capping agent containing acrylic acid groups for preparing a capped acrylic acid-based polyurethane prepolymer; carrying out a random double-bond homo-polymerization reaction on the dopamine methacrylamide, the capped acrylic acid-based polyurethane prepolymer and a thermal initiator to prepare the polydopamine propylene-based polyurethane adhesive. The method combines the advantages of designability and adjustable proportion of waterborne polyurethane molecules, a dopamine-modified substance DMA containing catechol groups is introduced into a waterborne polyurethane chain through thermal initiation polymerization, and the catechol groups in dopamine are quantitatively introduced into the waterborne polyurethane chain by utilizing the characteristic of high efficiency of the thermal initiation double-bondrandom homo-polymerization reaction. Compared with previous dopamine-modified polyurethane methods, the method can greatly increase the molecular mass of single polymers and enhance the cohesion of the polymers, thereby improving the adhesive mechanical property of the adhesive.

Description

Technical field [0001] The invention belongs to the technical field of materials science, and specifically discloses a polydopamine acrylic-based polyurethane adhesive and a preparation method thereof. Background technique [0002] In the science of polymer materials, the development and application of adhesive materials provide important support for the changes in people’s production and lifestyles. With the extensive and professional development of adhesive applications, the adhesive performance and environmental protection of adhesives Performance also puts forward more stringent requirements. [0003] In recent years, water-based polyurethane (WPU) is gradually replacing traditional solvent-based polyurethane with its green environmental protection and good adhesion performance, and has become a hot research direction of polyurethane adhesive materials. WPU has the characteristics of free design of molecular structure and adjustable soft segment / hard segment ratio. Polyurethan...

Claims

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Application Information

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IPC IPC(8): C09J151/08C08F283/00C08F220/58
CPCC08F283/008C09J151/08C08F220/58
Inventor 任龙芳雷平川强涛涛邵庆涛黄仕明
Owner SHAANXI UNIV OF SCI & TECH
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