UV hydrolyzed glue and preparation method thereof

Abstract

The invention relates to the field of adhesives, in particular to a UV hydrolyzed adhesive and a preparation method thereof. The adhesive is prepared from raw materials in percentage by weight as follows: 40%-58% of modified polyurethane acrylate, 10%-20% of a tackifying water absorbent, 1%-3% of a photoinitiator and the balance of a reactive diluent, the tackifying water absorbent is prepared from a polyurethane associated thickener, methanol etherified melamino-formaldehyde resin, water absorbent fibers and hydroxyl acrylate. The preparation method comprises the following steps: specifically selecting a polyurethane associated thickener, methanol etherified melamino-formaldehyde resin, water-absorbing fibers and hydroxyl acrylate as main components of a tackifying water absorbent, and optimizing the ratio of the main components; the adhesion strength and the hydrolysis separation effect of the UV hydrolytic adhesive on the surfaces of light-weight composite materials such as carbon fiber composite materials and glass fiber reinforced plastics are remarkably improved.

Description

Technical Field

[0001] This application relates to the field of adhesives, and more specifically, it relates to a UV hydrolysis adhesive and its preparation method. Background Art

[0002] As a special type of UV curable adhesive, UV hydrolysis adhesives have gradually emerged in the industrial field. Their core advantage lies in the ability to rapidly cure under ultraviolet light irradiation to form a high-strength bonding effect, and at the same time, under specific conditions (such as hydrolysis), the bonding strength can be reduced by treatment with water or a specific aqueous solution, thereby realizing the separation of bonded components. This unique property has enabled it to be widely used in fields such as electronics and medical, optics, and automotive. With the development of new energy vehicles, it has further promoted its application in the bonding of lightweight composite materials. However, despite the important value demonstrated by UV hydrolysis adhesives with their rapid curing, high bonding strength, and easy separation without residue, their applicability on different material surfaces still faces challenges.

[0003] To improve the bonding performance of UV hydrolysis adhesives, the prior art usually adopts the following means: by compounding and optimizing various polyester polyols, and then introducing epoxy-containing monomers to enhance adhesion to improve the basic properties of the adhesive; the second is to add tackifiers to strengthen the adhesion strength between the adhesive layer and the substrate; the third is to introduce photoinitiators to accelerate the efficiency of the UV curing process. In addition, in order to achieve the reversibility of the adhesive layer, a water-absorbing resin is also added to improve its hydrolysis ability. These methods have achieved certain results in the application of traditional materials such as glass and metal, showing good adhesion performance.

[0004] However, existing UV hydrolysis adhesives still have obvious deficiencies when facing new lightweight composite materials (such as carbon fiber composite materials, glass fiber reinforced plastics, etc.). Especially on the surfaces of these materials, the phenomenon of unstable adhesion is prone to occur, resulting in problems such as insufficient bonding strength or residue after hydrolysis, seriously affecting their actual application effects. Therefore, how to effectively solve the adhesion problem of UV hydrolysis adhesives on the surfaces of carbon fiber composite materials and glass fiber reinforced plastics, while taking into account their hydrolysis performance, has become a technical bottleneck that urgently needs to be broken through currently. Summary of the Invention

[0005] In order to improve the adhesion stability of UV hydrolysis adhesives on lightweight materials such as carbon fiber composite materials and glass fiber reinforced plastics, and at the same time be able to quickly fall off during hydrolysis, this application provides a UV hydrolysis adhesive and its preparation method.

[0006] In the first aspect, this application provides a UV hydrolysis adhesive, adopting the following technical solution: It is composed of the following raw materials in weight percentages: Modified polyurethane acrylate 40 - 58% Tackifying water absorbent: 10 - 20% Photoinitiator: 1 - 3% The balance is active diluent; The tackifying water absorbent consists of a polyurethane associative thickener, a methanol-etherified melamine formaldehyde resin, water-absorbing fibers, and hydroxyacrylate.

[0007] By adopting the above technical solution, the modified polyurethane acrylate provides high flexibility and strong adhesion, ensuring that the cured adhesive layer has good mechanical properties and chemical resistance. The polyurethane associative thickener in the tackifying water absorbent forms a three-dimensional network structure through intermolecular association, significantly improving the thixotropy and anti-sagging property of the adhesive liquid, while enhancing the mechanical strength and toughness of the adhesive layer. The methanol-etherified melamine formaldehyde resin introduces a triazine ring structure, further enhancing the heat resistance and chemical resistance of the adhesive layer. Its etherification modification reduces the hydrolysis sensitivity, while retaining moderate water absorption to assist in debonding. The water-absorbing fibers quickly absorb water with a high specific surface area and conduct it to the inside of the adhesive layer. After absorbing water, the volume expands to generate a mechanical peeling force, promoting the detachment of the adhesive layer without leaving residues. The hydroxyl functional group in the hydroxyacrylate can form hydrogen bonds with the substrate surface, enhancing the initial adhesion force, and participating in the cross-linking reaction during the UV curing process to form a dense network structure, enhancing the cohesive strength of the adhesive layer, while being able to promote water absorption and disperse the water-absorbing fibers. The above components work synergistically, enabling the UV hydrolysis adhesive to achieve rapid curing and controllable detachment while maintaining high adhesion strength, and is particularly suitable for temporary bonding scenarios of lightweight materials such as carbon fiber and glass fiber.

[0008] Preferably, the tackifying water absorbent consists of a polyurethane associative thickener, a methanol-etherified melamine formaldehyde resin, water-absorbing fibers, and hydroxyacrylate in a weight ratio of 1:(1.2 - 1.5):(3 - 5):(5 - 8).

[0009] By adopting the above technical solution, the polyurethane associative thickener and the methanol-etherified melamine formaldehyde resin cooperate with each other to form a stable three-dimensional network structure, significantly enhancing the mechanical strength and toughness of the adhesive layer, ensuring excellent adhesion performance on the surface of lightweight materials such as carbon fiber and glass fiber. The hydroxyl functional group in the hydroxyacrylate can form hydrogen bonds with the substrate surface, further enhancing the initial adhesion force, and participating in the cross-linking reaction during the UV curing process to form a dense network structure, effectively reducing the detachment phenomenon during bonding. The water-absorbing fibers expand in volume after absorbing water, generating a mechanical peeling force, and working synergistically with the modified polyurethane acrylate to quickly reduce the cohesive force during hydrolysis, realizing the separation of the adhesive layer from the substrate and avoiding residues remaining on the material surface. In addition, the optimized combination of the photoinitiator and the active diluent ensures the UV curing efficiency, enabling the adhesive layer to achieve an ideal curing effect in a short time, thus meeting the requirements of the temporary bonding scenario.

[0010] Preferably, the water-absorbing fiber is alginate fiber and / or sodium acrylate fiber.

[0011] By adopting the above technical solution, the introduction of alginate fiber and sodium acrylate fiber significantly improves the adhesion stability of the UV hydrolysis glue on specific substrates, while ensuring its performance of rapid hydrolysis and shedding. Alginate fiber, with its natural biocompatibility and degradability, provides good water solubility and enhanced mechanical properties, while sodium acrylate fiber further improves the flexibility and impact resistance of the colloid through its excellent solubility and flexible molecular structure. The synergistic effect of the two fibers ensures the adhesion stability of the UV hydrolysis glue on the surfaces of carbon fiber materials, glass fibers, etc., and can quickly shed during the hydrolysis process without leaving residues.

[0012] Preferably, the weight ratio of the alginate fiber to the sodium acrylate fiber is 3:(1 - 2).

[0013] By adopting the above technical solution, the alginate fiber and sodium acrylate fiber are proportioned at a weight ratio of 3:(1 - 2), which can optimize the water absorption and swelling performance of the UV hydrolysis glue while ensuring good adhesion strength. Alginate fiber provides higher strength and toughness, enhancing the tensile properties and elongation at break of the colloid, while sodium acrylate fiber improves the flexibility and impact resistance of the colloid through its solubility and flexible molecular structure. The two act synergistically in a specific proportion, enabling the colloid to maintain adhesion stability on the surfaces of carbon fiber materials, glass fibers, etc., and still quickly shed during the hydrolysis process without leaving residues.

[0014] Preferably, the particle size of the alginate fiber and the sodium acrylate fiber is 1 - 5 microns, and the length is 30 - 50 microns.

[0015] By adopting the above technical solution, the particle size of the alginate fiber and the sodium acrylate fiber is controlled within 1 - 5 microns, and the length is controlled within 30 - 50 microns, which can significantly improve the performance of the UV hydrolysis glue. The specific effects are as follows: The precise control of the particle size and length makes the fibers more evenly dispersed in the colloid, avoiding agglomeration caused by too large or too small particles, thereby improving the overall stability and adhesion performance of the colloid.

[0016] The moderate particle size and length are conducive to the fibers making full contact with the substrate surface, increasing the effective adhesion area, and obtaining better adhesion stability especially on the surfaces of carbon fiber materials, glass fibers, etc.

[0017] During the hydrolysis process, the size design of the fibers helps to quickly swell after water absorption, generating mechanical peeling force to achieve rapid separation between the glue layer and the substrate without leaving residues.

[0018] Preferably, the water-absorbing fiber is a surface-modified water-absorbing fiber, and the surface-modified water-absorbing fiber is composed of the following raw materials by weight percentage: 1 - 5% of γ - ureidopropyltriethoxysilane 0.5 - 3% of methacryloylethylsulfobetaine 30 - 50% of water - absorbing fiber The balance is organic solvent.

[0019] By adopting the above - mentioned technical solution, the surface - modified water - absorbing fiber can significantly improve the comprehensive performance of the UV hydrolysis glue. The specific effects are as follows: γ - ureidopropyltriethoxysilane forms a dense coating film with the water - absorbing fiber, enhancing the hydrolysis resistance and bonding force of the fiber, while adjusting the wettability of the fiber surface and optimizing the water - absorption performance; methacryloylethylsulfobetaine forms an ionic bond with the negatively charged groups on the fiber surface through the positively charged group, further stabilizing the fiber structure and promoting water diffusion, thereby increasing the water - absorption rate; the water - absorbing fiber, as the main water - absorbing component, maintains good water - absorption and swelling properties after modification, providing a mechanical peeling force for the degumming process; the use of the organic solvent ensures the uniformity of the modification process and avoids damage to the fiber structure. Overall, while enhancing the adhesive strength of the glue layer, the surface - modified water - absorbing fiber significantly improves the degumming performance after water absorption, achieving the effect of rapid and residue - free peeling.

[0020] Preferably, the surface - modified water - absorbing fiber is prepared by the following method: Weigh γ - ureidopropyltriethoxysilane and methacryloylethylsulfobetaine according to the weight percentage, dissolve them in the organic solvent, then add the water - absorbing fiber, mix evenly, filter, and dry the obtained filter residue to obtain the surface - modified water - absorbing fiber.

[0021] By adopting the above - mentioned technical solution, the preparation method of the surface - modified water - absorbing fiber can significantly improve the comprehensive performance of the UV hydrolysis glue. The specific effects are as follows: After γ - ureidopropyltriethoxysilane combines with the water - absorbing fiber, a dense coating film is formed, enhancing the hydrolysis resistance of the fiber. At the same time, the bonding force between the fibers is improved through hydrogen - bond interaction, reducing the generation of residues during degumming.

[0022] The introduction of methacryloylethylsulfobetaine endows the fiber with positive charge, enhancing its electrostatic adsorption ability with negatively charged substrates or fibers, and promoting the diffusion of water inside the fiber, thus increasing the water - absorption rate.

[0023] This preparation method ensures the uniform distribution of the modifier on the surface of the water - absorbing fiber, optimizes the wettability and water - absorption performance of the fiber, thereby realizing rapid water absorption and swelling, reducing the cohesive force, and cooperating with the mechanical peeling effect to achieve rapid degumming without residue.

[0024] Preferably, the photo - initiator is photo - initiator TPO and / or photo - initiator 1173.

[0025] By adopting the above technical solution, the reasonable selection of photoinitiators can efficiently absorb UV light energy and rapidly generate free radicals, thereby significantly enhancing the curing speed of the UV hydrolysis adhesive. Meanwhile, optimizing the types and concentrations of photoinitiators can balance the curing speed and curing depth, avoid internal stress caused by excessive surface curing, and ensure the quality of the adhesive layer.

[0026] Preferably, the reactive diluent is triethylene glycol dimethacrylate and / or bisphenol A diglycidyl ether diacrylate.

[0027] By adopting the above technical solution, triethylene glycol dimethacrylate and bisphenol A diglycidyl ether diacrylate as reactive diluents can effectively adjust the system viscosity and simultaneously promote the uniform dispersion and mixing of various raw materials. The introduction of these two reactive diluents not only improves the overall fluidity of the adhesive solution but also ensures the stable distribution of the tackifier absorbent, modified polyurethane acrylate, and photoinitiator in the system, thereby providing a more uniform reaction environment for the subsequent curing reaction and further optimizing the comprehensive performance of the UV hydrolysis adhesive.

[0028] In a second aspect, a preparation method of a UV hydrolysis adhesive is obtained by the following method: Weigh a polyurethane associative thickener and a melamine formaldehyde resin etherified with methanol and dissolve them in absolute ethanol. Then add hydroxyacrylate for one-step activation, and then add absorbent fiber and disperse evenly. Remove the absolute ethanol to obtain a tackifier absorbent. Weigh the modified polyurethane acrylate and the photoinitiator and disperse them in 1 / 2 of the reactive diluent to obtain dispersion A; weigh the tackifier absorbent and disperse it in 1 / 2 of the reactive diluent to obtain dispersion B; then add dispersion B to dispersion A and mix evenly to obtain the UV hydrolysis adhesive.

[0029] By adopting the above technical solution, after the polyurethane associative thickener and the melamine formaldehyde resin etherified with methanol are dissolved in absolute ethanol, hydroxyacrylate is added for activation to form the basic characteristics of high adhesion strength and rapid curing. By further adding absorbent fiber and dispersing evenly, the prepared tackifier absorbent significantly enhances the water absorption and debonding performance of the colloid. Mixing the tackifier absorbent with the modified polyurethane acrylate, photoinitiator, and reactive diluent step by step ensures the full dispersion of each component. The finally obtained UV hydrolysis adhesive not only has the characteristics of rapid curing and high adhesion strength but also can rapidly absorb water and fall off without residue when needed. In particular, this preparation method optimizes the addition sequence and treatment method of each component, effectively improving the overall performance and stability of the colloid.

[0030] In summary, the present application includes at least one of the following beneficial technical effects: 1. By specifically selecting polyurethane associative thickener, methanol-etherified melamine formaldehyde resin, water-absorbing fiber, and hydroxyacrylate as the main components of the tackifying water absorbent and optimizing their proportions, the adhesion strength and durability of the UV hydrolysis adhesive on the surfaces of lightweight composite materials such as carbon fiber composites and glass fiber reinforced plastics have been significantly improved; 2. Seaweed fiber and acrylate fiber are specifically selected as the water-absorbing fibers. Utilizing their unique molecular structures and high water-absorbing properties, not only the initial adhesion of the adhesive layer is enhanced, but also the cohesive strength is effectively reduced through rapid water absorption and swelling during the hydrolysis process, achieving rapid and residue-free detachment; 3. By surface-modifying the water-absorbing fibers and using the synergistic effect of γ-ureidopropyltriethoxysilane and methacryloylethyl sulfobetaine, a stable coating film is formed on the fiber surface, further optimizing the wettability and dispersibility of the water-absorbing fibers, and significantly improving the water absorption rate and debonding performance of the adhesive layer.. Description of the Drawings Detailed Description of the Embodiments

[0031] The present application will be further described in detail below in conjunction with the embodiments.

[0032] Sources of some raw materials: Polyurethane associative thickener: Wacker with German technical background Methanol-etherified melamine formaldehyde resin: 066LF; Modified polyurethane acrylate: R2601 of Jining Tangyi Chemical Co., Ltd.; Methacryloylethyl sulfobetaine: CAS No. 3637-26-1; Bisphenol A diglycidyl ether diacrylate (ethoxylated bisphenol A diacrylate) CAS: 4401-02-1. Embodiments

[0033] Example 1 By weight, weigh the polyurethane associative thickener and methanol-etherified melamine formaldehyde resin, dissolve them in anhydrous ethanol, then add hydroxyacrylate (hydroxyethyl acrylate), stir evenly, perform one-step activation, and then add the water-absorbing fiber to make it disperse evenly. Heat to 60 °C to completely remove the anhydrous ethanol to obtain the tackifying water absorbent; among them, the tackifying water absorbent is composed of polyurethane associative thickener, methanol-etherified melamine formaldehyde resin, water-absorbing fiber, and hydroxyacrylate in a weight ratio of 1:1.2:3:5.

[0034] Weigh 40% modified polyurethane acrylate and 3% photoinitiator (photoinitiator TPO) and disperse them in 18.5% reactive diluent to obtain dispersion A; then weigh 20% tackifier and water absorbent and disperse it in 18.5% reactive diluent to obtain dispersion B; then add dispersion B to dispersion A and mix evenly to obtain UV hydrolysis glue.

[0035] The water absorbent fiber is seaweed fiber. The particle sizes of both seaweed fiber and sodium acrylate fiber are 1 - 5 microns, and the lengths are 30 - 50 microns. In this example, the particle size is preferably 2 microns and the length is 38 microns. The reactive diluent is composed of triethylene glycol dimethacrylate and bisphenol A diglycidyl ether dimethacrylate at a weight ratio of 3:1.

[0036] Example 2 The difference between Example 2 and Example 1 lies in the different amounts of raw materials, specifically as follows: by weight percentage, 50% modified polyurethane acrylate, 13% tackifier and water absorbent, 2% photoinitiator, 35% reactive diluent.

[0037] Example 3 The difference between Example 3 and Example 1 lies in the different amounts of raw materials, specifically as follows: 60% modified polyurethane acrylate, 10% tackifier and water absorbent, 1% photoinitiator, 29% reactive diluent.

[0038] Example 4 The difference between Example 4 and Example 1 is that the water absorbent fiber is sodium acrylate fiber.

[0039] Example 5 The difference between Example 5 and Example 1 is that the weight ratio of seaweed fiber to sodium acrylate fiber is 3:1.

[0040] Example 6 The difference between Example 6 and Example 1 is that the weight ratio of seaweed fiber to sodium acrylate fiber is 3:2.

[0041] Example 7 The difference between Example 7 and Example 5 is that the water absorbent fiber is surface - modified water absorbent fiber, and the surface - modified water absorbent fiber is prepared by the following method: By weight percentage, weigh 1% γ - ureidopropyltriethoxysilane and 3% methacryloylethylsulfobetaine, dissolve them in 66% methanol, then add 30% water absorbent fiber, mix evenly, filter, and dry the obtained filter residue to obtain surface - modified water absorbent fiber.

[0042] Example 8 Example 8 is different from Example 7 in that the dosages of raw materials are different, specifically as follows: γ-ureidopropyltriethoxysilane 4.2%, methacryloylethylsulfobetaine 0.8%, water-absorbing fiber 40%, and methanol 55%.

[0043] Example 9 Example 9 is different from Example 7 in that the dosages of raw materials are different, specifically as follows: γ-ureidopropyltriethoxysilane 5%, methacryloylethylsulfobetaine 0.5%, water-absorbing fiber 50%, and methanol 49.5%.

[0044] Comparative example Comparative example 1 Comparative example 1 is different from Example 1 in that the tackifying water-absorbent is equivalently replaced with modified polyurethane acrylate.

[0045] Comparative example 2 Comparative example 2 is different from Example 1 in that the water-absorbing fiber is equivalently replaced with hydroxyacrylate.

[0046] Comparative example 3 Comparative example 3 is different from Example 1 in that the methanol-etherified melamine formaldehyde resin is equivalently replaced with hydroxyacrylate.

[0047] Performance detection test Detection method / Test method Peel strength: GB / T 2790-1995 "Test method for 180° peel strength of adhesives - Flexible materials to rigid materials". Specifically, the UV hydrolysis adhesives obtained in Examples 1-9 and Comparative examples 1-3 are respectively adhered to the surfaces of carbon fiber composite plates and glass fiber reinforced plastic plates. After curing (irradiating with ultraviolet light of 365 nm wavelength for 1 min), the peel strength is then detected; Hydrolysis detachment: The UV hydrolysis adhesives obtained in Examples 1-9 and Comparative examples 1-3 are respectively adhered to the surfaces of carbon fiber composites and glass fiber reinforced plastics. After curing (irradiating with ultraviolet light of 365 nm wavelength for 1 min), a 0.2 mm thick UV hydrolysis film is formed on their surfaces, and then it is placed in water at 23°C to be completely immersed. After 10 min, it is taken out and air-dried, and a 50-fold magnifying glass is used to observe whether there is any residue of the UV hydrolysis adhesive on its surface. If the above phenomenon occurs, it is recorded as unqualified.

[0048] The above experimental data are specifically shown in Table 1; Table 1 Experimental data of Examples 1-9 and Comparative examples 1-3 Combining Example 1 and Comparative Examples 1-3 and referring to Table 1, it can be seen that the peel strengths of Comparative Examples 1-3 are all lower than that of Example 1, and the dehydration separation effect of Example 1 is better. This shows that using a tackifying water absorbent composed of a polyurethane associative thickener, a methanol-etherified melamine formaldehyde resin, water-absorbing fibers, and hydroxyacrylate can achieve better stability on the surfaces of carbon fiber composites and glass fiber reinforced plastics, and is easy to undergo hydrolysis detachment, improving its practicality.

[0049] Comparing Example 1 and Example 7, it can be seen that the peel strength of Example 1 is lower than that of Example 7. This shows that using the surface-modified water-absorbing fibers of the present application can further improve the adhesion performance of the UV hydrolysis adhesive and enhance its stability on the surfaces of carbon fiber composites and glass fiber reinforced plastics.

[0050] This specific embodiment is only an explanation of the present application and does not limit the present application. After reading this specification, those skilled in the art can make modifications to this embodiment that do not contribute creatively as needed, but as long as it is within the scope of the claims of the present application, it is protected by the patent law.

Claims

1. A UV hydrolysis glue, characterized in that, It consists of raw materials in the following weight percentages: Modified polyurethane acrylate 40 - 58% Tackifying water absorbent 10 - 20% Photoinitiator 1 - 3% The balance is active diluent; The tackifying water absorbent consists of polyurethane associative thickener, methanol etherified melamine formaldehyde resin, water absorbent fiber, and hydroxyacrylate.

2. The UV hydrolysis glue according to claim 1, wherein: The tackifying water absorbent consists of polyurethane associative thickener, methanol etherified melamine formaldehyde resin, water absorbent fiber, and hydroxyacrylate in a weight ratio of 1:(1.2 - 1.5):(3 - 5):(5 - 8).

3. A UV hydrolysis adhesive according to claim 1, characterized in that: The water absorbent fiber is seaweed fiber and / or sodium acrylate fiber.

4. The UV hydrolysis adhesive according to claim 3, characterized in that: The weight ratio of the seaweed fiber to the sodium acrylate fiber is 3:(1 - 2).

5. The UV hydrolysis glue according to claim 3, wherein: The particle size of the seaweed fiber and the sodium acrylate fiber is 1 - 5 microns, and the length is 30 - 50 microns.

6. A UV hydrolysis adhesive according to any one of claims 1-5, characterized in that: The water absorbent fiber is surface-modified water absorbent fiber, and the surface-modified water absorbent fiber consists of raw materials in the following weight percentages: γ-ureidopropyltriethoxysilane 1 - 5% Methacryloylethylsulfobetaine 0.5 - 3% Water absorbent fiber 30 - 50% The balance is organic solvent.

7. The UV hydrolysis adhesive according to claim 6, wherein, The surface-modified water absorbent fiber is prepared by the following method: Weigh γ-ureidopropyltriethoxysilane and methacryloylethylsulfobetaine according to weight percentages, dissolve them in the organic solvent, then add the water absorbent fiber, mix evenly, filter, and dry the obtained filter residue to obtain the surface-modified water absorbent fiber.

8. The UV hydrolysis glue according to claim 1, wherein: The photoinitiator is photoinitiator TPO and / or photoinitiator 1173.

9. The UV hydrolysis adhesive according to claim 3, wherein: The active diluent is triethylene glycol dimethacrylate and / or bisphenol A diglycidyl ether diacrylate.

10. A method for preparing the UV hydrolysis glue according to any one of claims 1-9, characterized in that, It is obtained by the following method: Weigh the polyurethane associative thickener and methanol etherified melamine formaldehyde resin according to parts by weight, dissolve them in absolute ethanol, then add hydroxyacrylate, perform one-step activation, then add the water absorbent fiber, disperse evenly, and remove the absolute ethanol to obtain the tackifying water absorbent; Weigh the modified polyurethane acrylate and photoinitiator, disperse them in 1 / 2 of the active diluent to obtain dispersion A; weigh the tackifying water absorbent and disperse it in 1 / 2 of the active diluent to obtain dispersion B; then add dispersion B to dispersion A and mix evenly to obtain the UV hydrolysis glue.

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