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Polyurethane dispersion modified polyacrylate pressure-sensitive adhesive and preparation method thereof

A polyurethane dispersion and polyacrylate technology, applied in the field of pressure-sensitive adhesives, can solve problems such as reducing adhesion, limiting the use of pressure-sensitive adhesives, and destroying substrates, achieving durable and firm bonding, excellent stability, and stable performance Effect

Pending Publication Date: 2021-02-09
HUNAN UNIV OF HUMANITIES SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The shear strength and heat resistance of uncrosslinked polyacrylate pressure-sensitive adhesives are insufficient, while the crosslinked polyacrylate will reduce its adhesion while increasing the cohesion, which is not conducive to the bonding of materials
There is also a method of adding a tackifier to improve the adhesive performance of the pressure-sensitive adhesive, but this method will make the pressure-sensitive adhesive difficult to peel off, and it will easily lead to damage to the substrate or the appearance of residual glue. These problems limit the use of pressure-sensitive adhesives. use

Method used

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Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach 1

[0021] Specific embodiment one: the preparation method of polyurethane dispersion modified polyacrylate pressure-sensitive adhesive of the present invention is implemented according to the following steps:

[0022] (1) Weigh 20% of water, 0.2% of ammonium persulfate and 0.2% of sodium bicarbonate as component A, weigh 30% of water, 47% of butyl acrylate, 1% of Acrylic acid, 0.5% hydroxyethyl acrylate, 1% allyloxy fatty alcohol polyoxyethylene ether ammonium sulfate, and 0.1% ammonium persulfate are component B;

[0023] (2) Stir component B with a magnetic stirrer for 20 min at a stirring rate of 800 r / min;

[0024] (3) Add component A into the reaction kettle with a stirring rate of 120 r / min. After the system is heated to 82°C, start to add component B dropwise for 90 minutes;

[0025] (4) After the dropwise addition, raise the temperature of the system by 3°C, keep it warm for 40 minutes, and then cool it down to obtain polyacrylate;

[0026] (5) Weigh 15% polyurethane di...

specific Embodiment approach 2

[0027] Specific embodiment two: the preparation method of polyurethane dispersion modified polyacrylate pressure-sensitive adhesive of the present invention is to implement according to the following steps:

[0028] (1) Weigh 20% of water, 0.3% of ammonium persulfate and 0.5% of sodium bicarbonate as component A, weigh 30% of water, 10% of butyl acrylate, and 36% of 2-ethylhexyl acrylate, 1% methacrylic acid, 1% hydroxypropyl acrylate, 1% allyloxynonylphenol polyoxyethylene ether ammonium sulfate, 0.2% ammonium persulfate as components B;

[0029] (2) Stir component B with a magnetic stirrer for 40 min at a stirring rate of 1000 r / min;

[0030] (3) Add component A into the reaction kettle with a stirring rate of 150 r / min. After the system is heated to 80°C, start to add component B dropwise for 150 min;

[0031] (4) After the dropwise addition, raise the temperature of the system by 5°C, keep it warm for 60 minutes, and then cool it down to obtain polyacrylate;

[0032] (5...

specific Embodiment approach 3

[0033] Specific embodiment three: the preparation method of polyurethane dispersion modified polyacrylate pressure-sensitive adhesive of the present invention is implemented according to the following steps:

[0034] (1) Weigh 20% of water, 0.2% of ammonium persulfate and 0.2% of sodium bicarbonate as component A, weigh 32% of water, 30% of butyl acrylate, 15% of 2-ethylhexyl acrylate, 1% acrylic acid, 1% hydroxyethyl acrylate, 0.5% allyloxynonylphenol polyoxyethylene ether ammonium sulfate, and 0.1% ammonium persulfate are component B;

[0035] (2) Stir component B with a magnetic stirrer for 30 min at a stirring rate of 1200 r / min;

[0036] (3) Add component A into the reaction kettle with a stirring rate of 150 r / min. After the system is heated to 82°C, start to add component B dropwise for 150 min;

[0037] (4) After the dropwise addition, raise the temperature of the system by 3°C, keep it warm for 40 minutes, and then cool it down to obtain polyacrylate;

[0038] (5) W...

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Abstract

The invention discloses a polyurethane dispersion modified polyacrylate pressure-sensitive adhesive and a preparation method thereof, and the polyurethane dispersion modified polyacrylate pressure-sensitive adhesive is characterized in that the weight percentage ratio of polyurethane dispersion to polyacrylate is (5-20%): (80-95%). The polyurethane dispersion is a waterborne anionic polyurethane dispersion, and the polyacrylate is prepared from water, a soft monomer, a polar monomer, a surfactant monomer, an initiator and a pH buffer agent as raw materials by adopting an emulsion polymerization method. When the polyurethane dispersion modified polyacrylate pressure-sensitive adhesive is used, additives do not need to be added, the problems that an adhesive layer of an existing pressure-sensitive adhesive is damaged, the existing pressure-sensitive adhesive is prone to falling off from the surface of a base material, adhesive residues exist and the like can be solved, and the bonding strength of the pressure-sensitive adhesive is improved.

Description

technical field [0001] The invention relates to the technical field of pressure-sensitive adhesives, in particular to a polyurethane dispersion modified polyacrylate pressure-sensitive adhesive and a preparation method thereof. Background technique [0002] Pressure-sensitive adhesives are sensitive to pressure and can be bonded with only slight pressure. Polyacrylate is widely used in the preparation of pressure-sensitive adhesives due to its high transparency, aging resistance and good medium resistance, and has developed rapidly in recent years. At the same time, there are many types of acrylate monomers, which also provide great selectivity for the formulation design of pressure-sensitive adhesives for different purposes. Although polyacrylate solvent-based pressure-sensitive adhesives have good adhesive properties, there are problems in environmental protection, resources, energy and safety due to the use of a large amount of solvents in the preparation process, making...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J133/08C09J175/04C08F283/06C08F220/18C08F220/06C08F220/20
CPCC08F283/065C09J133/066C08L75/04C08F220/1804C08F220/06C08F220/20C08F220/1808
Inventor 张蕾汲长艳宁旭涛李克文
Owner HUNAN UNIV OF HUMANITIES SCI & TECH
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