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CN-121975461-A - Octyl acrylate-based wet adhesive and preparation method thereof

CN121975461ACN 121975461 ACN121975461 ACN 121975461ACN-121975461-A

Abstract

The invention discloses an acrylic acid octyl ester based wet sticky adhesive and a preparation method thereof, belonging to the technical field of adhesives. The adhesive is composed of raw materials such as octyl acrylate, functional monomers, cationic monomers, double cross-linking agents, mixed tackifying resin and the like, adopts a UV-thermal step polymerization process, firstly forms a uniform prepolymerization network through low-intensity UV prepolymerization, and then matches an isocyanate-epoxy composite curing agent compact cross-linking structure through thermal polymerization complementary reaction, so as to solve the problems of weak wet adhesion, uneven cross-linking and insufficient water resistance of the existing product. The product has excellent wet adhesion performance, high cohesive strength and environmental protection, the peeling strength in a 37 ℃ wet environment is more than or equal to 8.65N/25mm, the moisture and heat aging retention rate is more than 85%, the VOC emission is low, and the product is suitable for multiple scenes such as medical dressing, flexible electronic packaging, wet environment packaging and the like.

Inventors

  • ZHOU FENG
  • HUANG DEMING
  • CHENG SHICHENG
  • HUANG TIANBAO
  • QIU SHUJIAN

Assignees

  • 江西3L医用制品集团股份有限公司

Dates

Publication Date
20260505
Application Date
20260320

Claims (9)

  1. 1. The octyl acrylate-based wet sticky adhesive is characterized by comprising the following raw materials in parts by mass: 25-35 parts of octyl acrylate; 2.5-3.5 parts of acrylic acid; 1.0-2.0 parts of hydroxyethyl methacrylate; 0.2-0.5 part of cationic monomer; 0.2-0.5 part of active ester crosslinking monomer; 0.004-0.006 parts of cross-linking agent; 0.15-0.25 part of photoinitiator; 0.8-1.2 parts of thermal initiator; 1.4-1.7 parts of tackifying resin; 1.3-1.5 parts of curing agent; 40-50 parts of a solvent; Wherein the cationic monomer is benzyl vinyl trimethyl ammonium chloride, the active ester crosslinking monomer is acrylic acid N-hydroxysuccinimide ester, and the crosslinking agent is N, N-methylene bisacrylamide; the photoinitiator is 2-hydroxy-2-methyl-1-phenyl-1-acetone, and the thermal initiator is lauroyl peroxide.
  2. 2. The octyl acrylate based wet tack adhesive of claim 1 wherein the molar ratio of octyl acrylate, acrylic acid, hydroxyethyl methacrylate, cationic monomer to active ester crosslinking monomer is 100-120:25-30:7-9:0.8-1.2:0.9-1.3.
  3. 3. The octyl acrylate-based wet tack adhesive of claim 1, wherein the tackifying resin is an esterified rosin, a terpene-phenol resin, and a liquid rosin resin in a mass ratio of 5-7:6-8:1-3.
  4. 4. The octyl acrylate-based wet tack adhesive according to claim 1, wherein the curing agent is an isocyanate curing agent and an epoxy curing agent in a mass ratio of 5-7:1.
  5. 5. The octyl acrylate-based wet tack adhesive according to claim 1, wherein the solvent is a mixed solvent of deionized water, ethyl acetate and toluene in a volume ratio of 1:7-9:5-7.
  6. 6. A method of preparing an octyl acrylate based wet tack adhesive as claimed in any one of claims 1 to 5 comprising the steps of: s1, preparing a polymer solution: mixing octyl acrylate, acrylic acid, hydroxyethyl methacrylate, cationic monomer and active ester crosslinking monomer with a solvent, and stirring and dissolving under inert atmosphere to obtain monomer mixed solution; adding a cross-linking agent and a photoinitiator into the monomer mixed solution, uniformly stirring, and then carrying out ultraviolet irradiation to form a prepolymerization network; S2, blending an adhesive: Adding tackifying resin, a curing agent and an antioxidant into the polymer solution, and uniformly stirring to obtain the wet sticky adhesive.
  7. 7. The method for preparing octyl acrylate based wet adhesive according to claim 6, wherein in S1, the power of ultraviolet irradiation is 40-60W, the irradiation time is 10-20min, the temperature of the thermal polymerization reaction is 85-95 ℃ and the reaction time is 2-4h.
  8. 8. The method for producing octyl acrylate based wet tacky adhesive according to claim 6, wherein in S1, the monomer mixture is heated to 55-65 ℃ and stirred for 1-2 hours before being irradiated with ultraviolet light.
  9. 9. The method for preparing an octyl acrylate based wet tack adhesive according to claim 6, wherein the step of forming the adhesive tape is further included after the step of S2: The wet sticky adhesive is coated on a substrate, and is subjected to drying and curing treatment to obtain the wet sticky adhesive tape, wherein the drying condition is that the wet sticky adhesive is treated for 2-5min at 90-110 ℃, and the curing condition is that the wet sticky adhesive is cured for 2-4 days at 35-45 ℃.

Description

Octyl acrylate-based wet adhesive and preparation method thereof Technical Field The invention relates to the technical field of adhesives, in particular to an octyl acrylate-based wet adhesive and a preparation method thereof. Background The wet adhesive is widely applied in the fields of medical dressing, flexible electronic packaging, wet environment packaging and the like, wherein acrylic esters become the main stream direction due to good transparency and strong weather resistance. However, the prior art has obvious short plates: Firstly, the wet adhesion performance is weak, a water film wetting the surface of a substrate can block the interface effect of a glue layer and the substrate, so that the peeling strength is greatly attenuated, and the long-term wet use requirement is difficult to meet; Secondly, the design of a crosslinking system is unreasonable, and single thermal polymerization or UV polymerization is easy to cause uneven crosslinking, or insufficient cohesive strength causes slippage of a glue layer, or excessive viscosity loss affects wetting effect; Thirdly, the water resistance and the environmental protection are unbalanced, the VOC emission of the traditional solvent formula is higher, the solvent is easy to expand and lose efficacy after being soaked in water, and meanwhile, the single tackifying resin is difficult to balance the primary adhesion, the holding adhesion and the peeling strength, so that the suitability of the adhesive in a multi-substrate complex wet environment is limited, and the targeted optimization and upgrading are needed. Disclosure of Invention The invention aims to solve the defects in the prior art, and provides an octyl acrylate-based wet adhesive and a preparation method thereof. In order to achieve the above purpose, the present invention adopts the following technical scheme: The invention firstly provides an acrylic acid octyl ester-based wet sticky adhesive which is prepared from the following raw materials in parts by mass: 25-35 parts of octyl acrylate; 2.5-3.5 parts of acrylic acid; 1.0-2.0 parts of hydroxyethyl methacrylate; 0.2-0.5 part of cationic monomer; 0.2-0.5 part of active ester crosslinking monomer; 0.004-0.006 parts of cross-linking agent; 0.15-0.25 part of photoinitiator; 0.8-1.2 parts of thermal initiator; 1.4-1.7 parts of tackifying resin; 1.3-1.5 parts of curing agent; 40-50 parts of a solvent; Wherein the cationic monomer is benzyl vinyl trimethyl ammonium chloride, the active ester crosslinking monomer is acrylic acid N-hydroxysuccinimide ester, and the crosslinking agent is N, N-methylene bisacrylamide; the photoinitiator is 2-hydroxy-2-methyl-1-phenyl-1-acetone, and the thermal initiator is lauroyl peroxide. Preferably, the molar ratio of the octyl acrylate, the acrylic acid, the hydroxyethyl methacrylate, the cationic monomer and the active ester crosslinking monomer is 100-120:25-30:7-9:0.8-1.2:0.9-1.3. Preferably, the tackifying resin is esterified rosin, terpene phenol resin and liquid rosin resin with the mass ratio of 5-7:6-8:1-3. Preferably, the curing agent is isocyanate curing agent and epoxy curing agent with the mass ratio of 5-7:1. Preferably, the solvent is a mixed solvent of deionized water, ethyl acetate and toluene in a volume ratio of 1:7-9:5-7. The invention also provides a preparation method of the octyl acrylate-based wet sticky adhesive, which comprises the following steps: s1, preparing a polymer solution: mixing octyl acrylate, acrylic acid, hydroxyethyl methacrylate, cationic monomer and active ester crosslinking monomer with a solvent, and stirring and dissolving under inert atmosphere to obtain monomer mixed solution; adding a cross-linking agent and a photoinitiator into the monomer mixed solution, uniformly stirring, and then carrying out ultraviolet irradiation to form a prepolymerization network; Octyl acrylate provides basic tackiness and flexibility (low Tg), acrylic acid incorporates carboxyl groups to enhance polar interactions with the substrate, and hydroxyethyl methacrylate incorporates hydroxyl groups to provide reactive sites for subsequent crosslinking. The photoinitiator is decomposed under 40-60W ultraviolet light to generate free radicals, and the free radicals trigger the copolymerization of the monomer, a cross-linking agent (N, N-methylene bisacrylamide) and an active ester cross-linking monomer (N-hydroxysuccinimide acrylate), so that a lightly cross-linked prepolymerized network is preliminarily formed, the polymerization of the monomer during subsequent thermal polymerization is avoided, and the uniformity of the polymer structure is ensured. And (3) decomposing a thermal initiator at 85-95 ℃ to drive the residual monomers to completely polymerize, and simultaneously, reacting the hydroxyl of the hydroxyethyl methacrylate with an active ester group to perfect a crosslinked network, improve the cohesive strength of the polymer and avoid the fracture of a glue layer in a wet state.