Preparation method and application of ultraviolet-curable acrylic copolymer

A technology of copolymer and acrylic acid, which is applied in the field of pressure-sensitive adhesives, can solve the problems of high cost, high cost, and restrictions on commercial production, and achieve the effect of accelerated reaction rate and high photocuring efficiency

Pending Publication Date: 2022-03-01
SHENZHEN LIHE BOHUI PHOTOSENSITIVE MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, all these methods still have certain disadvantages, such as the special monomer co-containing benzophenone must be synthesized by a separate, complicated, and costly step, so its cost is much more expensive than traditional photoinitiators
In addition, the synthesis pollution of the production process is relatively large, and the waste water is difficult to treat, which seriously restricts the commercial production of this kind of raw materials. It is still difficult to buy suitable non-commercialized products in the market

Method used

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  • Preparation method and application of ultraviolet-curable acrylic copolymer
  • Preparation method and application of ultraviolet-curable acrylic copolymer
  • Preparation method and application of ultraviolet-curable acrylic copolymer

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[0024] see figure 1 , the application discloses a preparation method of an ultraviolet-curable acrylic copolymer, comprising the following steps: S1: polymerizing the acrylate monomer mixture in a solvent to form a copolymer solution; S2: adding two Benzophenone and / or benzophenone derivatives; S3: the entire solution is heated to evaporate the solvent to generate a solvent-free UV-curable acrylic copolymer.

[0025] The monomer mixture comprises: 70-95 parts by weight of the molecular formula CH 2 Acrylic or methacrylate monomers of -CH(R1)(C00R2), where R1 is H or CH 3 , R2 is an alkyl group containing 1-20 carbons. The monomer mixture can also be 0.1 to 30 parts by weight of (meth)acrylic acid or vinyl functional monomers, and the functional groups contained in the functional monomers include carboxyl, hydroxyl, anhydride, amine, amide one or more of epoxy, isocyanate or isocyanate groups.

[0026] The reactive group contained in the benzophenone derivative includes one...

Embodiment 1

[0032] Weigh the ingredients according to the table below

[0033] components Weight / grams) (2-Ethylhexyl) Acrylate 100 Methyl acrylate 10 acrylic acid 70 vinyl acetate 30 2-Hydroxyethyl Acrylate 10 n-butyl acrylate 780 AIBN initiator 4

[0034] 500 grams of the monomer mixture and 500 grams of ethyl acetate solvent were transferred to a 3 liter jacketed reactor. The reactor contents were heated to reflux temperature (approximately 80° C.) under nitrogen purge and stirring. After maintaining reflux for about 15 minutes, the remaining monomer mixture and 300 g of ethyl acetate solvent were added to the reactor via the dropping funnel, and the dropping time was 3 hours. After the dropwise addition was completed, the reaction was continued at reflux temperature for 4 hours to ensure that all residual AIBN was reacted. At this point, 3 grams of 4-aminobenzophenone was added to the reactor and slowly heated to about 160°...

Embodiment 2

[0036] According to the weighing of each material in Example 1, 500 g of monomer mixture and 500 g of ethyl acetate solvent were transferred to a 3-liter jacketed reactor. The reactor contents were heated to reflux temperature (approximately 80° C.) under nitrogen purge and stirring. After maintaining reflux for about 15 minutes, the remaining monomer mixture and 300 g of ethyl acetate solvent were added to the reactor via the dropping funnel, and the dropping time was 3 hours. After the dropwise addition was completed, the reaction was continued at reflux temperature for 4 hours to ensure that all residual AIBN was reacted. And slowly heated to about 160 ° C, most of the solvent and other organic volatiles are devolatilized. Then the reactor was evacuated at this temperature, and the remaining organic volatiles were continuously devolatilized until the residual organic volatiles content in the copolymer sample was less than 0.5%. The melt viscosity of the copolymer sample at ...

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Abstract

The invention discloses a preparation method of an ultraviolet-curable acrylic copolymer. The preparation method comprises the following steps: S1, polymerizing an acrylate monomer mixture in a solvent to form a copolymer solution; s2, adding benzophenone and / or a benzophenone derivative into the copolymer solution; and S3, heating the whole solution to evaporate the solvent so as to generate the solvent-free ultraviolet-curable acrylic copolymer. According to the present invention, the advantages of the existing UV light curing technology are maintained, the production process of the UV curing pressure-sensitive adhesive is simplified, the performance of the pressure-sensitive adhesive and the thermal stability of the product during the hot melting production process are effectively improved, and the benzophenone or the derivative thereof is introduced so as to improve the product quality of the acrylate copolymer.

Description

technical field [0001] The invention relates to the technical field of pressure-sensitive adhesives, in particular to a preparation method and application of an ultraviolet-curable acrylic copolymer. Background technique [0002] (Meth)acrylic copolymers are widely used in various industrial and consumer products, especially (meth)acrylic pressure-sensitive adhesives have many desirable properties and technical advantages, such as ease of use, excellent durability, optical properties, and Removability after long-term use. At present, the tape industry mainly uses solvent-based acrylic pressure-sensitive adhesives to produce high-performance pressure-sensitive adhesive products, but these solvent-based pressure-sensitive adhesives generally contain 45%-60% organic solvents, which brings great pressure to energy conservation and environmental protection. In recent years, with the increasingly stringent environmental regulations and the rising cost of solvents, UV-curable hot-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/18C08F220/14C08F220/06C08F220/20C09J133/08C09J7/38
CPCC08F220/1804C09J133/066C09J11/06C09J7/385C08K5/18C08K5/1515C08K5/29C08F220/1808C08F220/14C08F220/06C08F220/20
Inventor 卢新亚
Owner SHENZHEN LIHE BOHUI PHOTOSENSITIVE MATERIAL CO LTD
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