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Method for reducing volume shrinkage of photocuring coating by using hollow/porous elastic microspheres

A technology of porous microspheres and volume shrinkage, which is applied in coatings and other directions, can solve problems such as the decline in the comprehensive mechanical properties of materials and affect the use of materials, and achieve the effects of reducing volume shrinkage, reducing the amount of addition, and prolonging the reaction rate

Inactive Publication Date: 2021-06-01
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the commonly used method is to introduce fillers or chain transfer agents into the photocuring system, but the addition amount is generally more than 10%, and sometimes even more than 50%. Although the volume shrinkage rate has improved, the comprehensive mechanical properties of the material However, it has dropped sharply, seriously affecting its use

Method used

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  • Method for reducing volume shrinkage of photocuring coating by using hollow/porous elastic microspheres
  • Method for reducing volume shrinkage of photocuring coating by using hollow/porous elastic microspheres
  • Method for reducing volume shrinkage of photocuring coating by using hollow/porous elastic microspheres

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Experimental program
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Embodiment

[0035] The present invention can be better understood from the following examples. However, those skilled in the art will readily understand that the specific material ratios, process conditions and results described in the examples are only used to illustrate the present invention, and should not and will not limit the present invention described in detail in the claims .

[0036] In order to make the object, technical solution and advantages of the present invention clearer, the following examples are given to further describe the present invention in detail. Those skilled in the art should understand that the examples are only used to help understand the present invention, and are not intended to limit the present invention.

[0037] In order to optimize the scheme, the present invention systematically discusses the influence of the content of elastic hollow / porous microspheres on reducing coating shrinkage when the content of elastic hollow / porous microspheres is added in...

example 1

[0052] Example 1: without adding poroelastic microspheres

[0053] 1. Weigh 10g EA (bisphenol A type epoxy acrylate EA, 10g TPGDA (tripropylene glycol diacrylate) according to the mass ratio of 1:1, mix well and add 0.1g photoinitiator 1173 (2-hydroxy-2- Methyl-1-phenyl-1-propanone), the sample was protected from light and stirred for 6 hours at a stirring speed of 300rmp.

[0054] 2. Put the sample in a vacuum oven to remove air bubbles, then take a small amount of sample and pour it into the mold, and cure it with a crawler-type light curing machine to prepare a tensile sample and a dynamic thermal analysis test sample; take a small amount of sample on the aluminum plate The film is coated on the surface, and cured with a crawler-type light curing machine to obtain a light-cured coating.

[0055] 3. Carry out coating performance, mechanical properties, and infrared-rheological joint tests on the materials.

example 2

[0056] Example 2: Add 0.1g elastic hollow / porous microspheres

[0057] 1. Preparation of modified silica nanoparticles:

[0058] (1-1) First, synthesize silica nanoparticles by sol-gel method, put 2.8mL deionized water, 150mL absolute ethanol and 9.7mL ammonia water into a single-necked flask, raise the temperature to 60°C, and turn on the magnetic stirring, The stirring rate is 300rmp; 4mL of TEOS (tetraethyl orthosilicate) is slowly added dropwise to the above mixture, and after 6 hours of reaction, SiO 2 Dispersions.

[0059] (1-2) SiO to the above step (1-1) 2 Add 200 μL of silane coupling agent MPS dropwise to the dispersion, react at room temperature for 19 hours, and stir at 300 rpm. After the reaction, get SiO 2 - MPS dispersion, washed with ethanol and centrifuged three times, then put into a vacuum oven to dry, and finally obtained SiO2 nanoparticles with double bond modification.

[0060] 2. Preparation of elastic hollow / porous microspheres:

[0061] (2-1) Por...

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Abstract

The invention discloses application of elastic hollow / porous microspheres in a coating, and particularly relates to the application of the elastic hollow / porous microspheres in the coating to prepare the coating containing the elastic hollow / porous microspheres and reduce the curing volume shrinkage rate of the coating. Through a linear laser confocal method shrinkage rate test, the curing volume shrinkage rate of the coating containing the elastic hollow / porous microspheres is reduced by 30%-65%, and the elastic hollow / porous microspheres account for 0.5-2.5 wt% of the total mass of the matrix resin and the monomers. The modified silicon dioxide particles are used as an emulsifier, so that the compatibility of the elastic hollow / porous microspheres in the coating is improved; and the elastic hollow / porous microspheres are used for reducing the volume shrinkage rate of the photocuring coating, only about 1.5 wt% of microspheres are added, the volume shrinkage rate of the cured material is reduced, and the coating is kept to have excellent comprehensive performance.

Description

technical field [0001] The invention belongs to the technical field of light-cured coatings, and in particular relates to a method for reducing volume shrinkage of light-cured coatings by using hollow / porous elastic microspheres. Background technique [0002] Photocuring technology has the advantages of high efficiency, energy saving, environmental protection, economy, and wide applicability. However, the biggest problem limiting its application is the large volume shrinkage after polymerization. The root cause of this phenomenon is that the long-distance van der Waals force between the monomer molecules before and after the reaction changes to the covalent bond, and the change of the distance between the molecules on the microscopic level leads to the change of the volume on the macroscopic level. Generally, the volume shrinkage of light-curing systems is between 5% and 15%, and a large volume shrinkage seriously affects the molding accuracy, performance and service life of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D7/62C09D7/65
CPCC09D7/62C09D7/65C09D7/70C08K9/10C08K3/36C08K2201/011
Inventor 刘仁孙冠卿吴星仪张丽萍
Owner JIANGNAN UNIV
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