CN-122012010-A - UV low-energy quick-curing wire harness sealant

Abstract

The invention relates to a UV low-energy quick-curing wire harness sealant, which adopts polyurethane acrylic resin as main resin and is compounded with quick-curing double-functionality or tri-functionality polyurethane acrylic resin and a surface-drying and deep-curing photoinitiation system so as to solve the problems of uneven curing, sticky surface, insufficient adhesion to difficult-to-adhere substrates such as PA and the like of the existing UV glue under the low-energy curing condition. The sealant formulation may also contain acrylic monomers to improve adhesion, adjust viscosity, and improve flow, and adjuvants to provide thixotropic and chromogenic identification. Through the UV LED curing technology, rapid curing can be realized under the conditions of lower illumination intensity and shorter illumination time, so that the production efficiency is improved, the energy consumption is reduced, and the curing quality is ensured.

Inventors

• WEI YUNFENG
• WANG CHANGYONG
• LI JIMING
• QIAN RENJIE
• SUN LEDONG
• GONG QIUYAN

Assignees

• 苏州艾迪亨斯胶粘技术有限公司

Dates

Publication Date

20260512

Application Date

20260325

Claims (10)

1. 1. The Ultraviolet (UV) low-energy rapid-curing wire harness sealant is characterized by comprising the following components: the main resin is polyurethane acrylic resin, and the resin has excellent binding force to the nylon terminal; At least one surface drying photoinitiator for inhibiting oxygen inhibition and improving surface drying effect; At least one deep-curing photoinitiator for realizing deep curing of the adhesive layer; acrylic acid monomer for improving adhesion, adjusting viscosity and improving fluidity; at least one auxiliary agent for improving the adhesive force, fluidity and solidification property of the glue.
2. 2. The Ultraviolet (UV) low-energy rapid-curing wire harness sealant according to claim 1, wherein the main resin is polyurethane acrylic resin, specifically DR-U249, and the mass ratio is 70-80 parts.
3. 3. The UV low-energy rapid-curing wire harness sealant according to claim 1, wherein the proportion of the urethane acrylic resin in the main resin is 70-80 parts, and at least one rapid-curing difunctional or trifunctional urethane acrylic resin, specifically SW8801 or L8401, is added with a mass ratio of 20-30 parts.
4. 4. The UV low-energy rapid-curing wire harness sealant according to claim 1, wherein the surface-drying photoinitiator is a photoinitiator capable of inhibiting oxygen inhibition, specifically MBF, and is used for improving the surface curing effect, wherein the mass ratio of the photoinitiator is 5-7 parts.
5. 5. The Ultraviolet (UV) low-energy rapid-curing wire harness sealant according to claim 1, wherein the deep-curing photoinitiator is TMO, and the mass ratio of the deep-curing photoinitiator is 3-5 parts and is used for realizing deep curing of a glue layer.
6. 6. The UV low energy fast curing wire harness sealant according to claim 1, wherein the acrylic monomer is IBOA and DMAA, the IBOA mass ratio is 50-60 parts, the DMAA mass ratio is 20-30 parts, for improving adhesion and adjusting system viscosity.
7. 7. The UV low-energy rapid-curing wire harness sealant according to claim 1, wherein the auxiliary agent is a silane coupling agent, specifically KH-570, and the mass ratio is 1-3 parts, and the adhesive force between the glue and the nylon base material is enhanced.
8. 8. The UV low-energy rapid curing wire harness sealant according to claim 1, wherein the fumed silica in the wire harness sealant is R202, and the mass ratio of the fumed silica is 5-8 parts, so as to provide thixotropy and reduce system fluidity.
9. 9. The Ultraviolet (UV) low-energy rapid-curing wire harness sealant according to claim 1, wherein the fluorescent agent in the wire harness sealant is OB, and the mass ratio of the fluorescent agent to the wire harness sealant is 0.1-0.3 part, and the fluorescent agent is used for providing color development identification in a dispensing process.
10. 10. The UV low-energy rapid-curing wire harness sealant according to claim 1, wherein the curing condition of the wire harness sealant is an LED 365nm light source, the curing light intensity is 200-300 mw/cm 2 , and the irradiation time is 3-5 seconds.

Description

UV low-energy quick-curing wire harness sealant Technical Field The invention relates to the field of sealants, in particular to a UV low-energy rapid-curing wire harness sealant. Background In the modern industry, in particular in the automotive electronics, consumer electronics and industrial automation industries, the tightness of the electronic wiring harnesses and connectors is critical to ensure long-term stable operation of the equipment. In order to meet the high requirements of the industries on the sealing performance, the wire harness sealant is taken as an important sealing material and is widely applied to the protection and fixation of electronic elements. However, the existing wire harness sealant technology still has a plurality of problems, which seriously affect the application of the wire harness sealant under the requirements of efficient production and high performance. Conventional heat-curable wire harness sealants generally require a long time to heat to complete the curing process, and although this process can provide a stable curing effect, the curing speed is slow, resulting in low production efficiency, which cannot meet the requirements of modern mass production for rapid curing. In addition, the high temperature process used in the heat curing process increases energy consumption and may adversely affect some sensitive materials such as plastics and rubber, thereby reducing the physical properties of these materials and limiting the wide application of heat curing glues. In contrast, although the ultraviolet light curing wire harness sealant solves the problem of low curing speed to a certain extent, the existing ultraviolet light curing glue still has the problems of uneven curing, sticky surface, insufficient adhesion to materials such as nylon and the like. Conventional uv curable glues often require high intensity uv irradiation or long irradiation to complete the complete cure, which increases production costs, increases production cycle and consumes excessive energy. Another common problem is the difficulty in achieving both surface drying and deep curing during the curing process. Although the UV glue with faster surface drying has better surface curing effect, the problems of insufficient deep curing and insufficient curing depth often exist under the condition of lower curing energy, and the formula with slower overall curing speed is easily affected by oxygen polymerization inhibition, so that the conditions of surface stickiness or insufficient surface curing are caused, and the application effect and the appearance of a final product are affected. The problem of adhesion to nylon terminals is also a long standing problem in the prior art. Nylon, a material with low surface energy and high strength, is difficult to provide enough adhesion without additional surface treatment by conventional glues. Therefore, the ultraviolet curing glue in the prior art often needs to add a large amount of adhesive force monomers or carry out additional surface treatment, which not only increases the production cost, but also makes the product performance unstable and reduces the reliability of the glue in practical application. In addition, the curing conditions of the existing ultraviolet curing glue generally require higher illumination energy (such as ultraviolet energy above 1000mJ/cm 2), the requirement of high energy increases the production cost, and the problem of low energy efficiency cannot be effectively solved, especially the high energy consumption of the traditional glue is not suitable under the background that the requirements of the modern manufacturing industry on energy conservation, emission reduction and environmental protection are increasingly increased. In summary, the wire harness sealant in the prior art has significant defects in curing speed, adhesion, environmental protection, production efficiency and the like, and these problems not only affect the performance of the wire harness sealant in complex and severe applications, but also limit the wide application of the wire harness sealant in mass production. Therefore, there is a need for a new wire harness sealant that addresses these challenges in the prior art and meets the needs of the modern industry for efficient, stable and environmentally friendly materials. Disclosure of Invention In view of the above analysis, the present invention aims to provide a UV low energy rapid curing wire harness sealant to solve the problems in the background art. The aim of the invention is mainly realized by the following technical scheme: a UV low-energy rapid-curing wire harness sealant comprises the following components: the main resin is polyurethane acrylic resin, and the resin has excellent binding force to the nylon terminal; At least one surface drying photoinitiator for inhibiting oxygen inhibition and improving surface drying effect; At least one deep-curing photoinitiator for realizing deep curing of the a