Search

CN-121975466-A - Fluorine-containing adhesive for winding adhesive tape

CN121975466ACN 121975466 ACN121975466 ACN 121975466ACN-121975466-A

Abstract

The invention relates to the technical field of adhesives, in particular to a fluorine-containing adhesive for a winding adhesive tape. Conventional wrapping tapes have poor bond strength and bond stability to polyolefin low polarity surface substrates. The invention aims at the problems, and provides a fluorine-containing adhesive for a winding adhesive tape, which mainly takes an acrylic resin system as a main body, and forms an adhesive capable of forming a film by thermal polymerization through the special addition of an acrylic monomer structural design and a reactive modified nano inorganic phase (reactive modified nano silicon dioxide), wherein the obtained adhesive and the surface of a low-surface-energy substrate (such as polyolefin such as PP) can form the effect of stable high-strength adhesion.

Inventors

  • ZHOU XINGLEI
  • ZHOU GUOZHONG

Assignees

  • 江苏白鹭电器集团股份有限公司

Dates

Publication Date
20260505
Application Date
20260306

Claims (10)

  1. 1. The fluorine-containing adhesive for the winding adhesive tape is characterized by comprising the following raw materials in parts by weight: 75-100 parts of acrylic monomer mixture; 5-10 parts of reactive modified nano silicon dioxide; 10-30 parts of tackifying resin; 0.5-1.0 part of thermal initiator; 0.5-2.0 parts of metal ion complexing agent; The acrylic monomer mixture is a free radical polymerizable polymerization monomer, and comprises the following raw materials in parts by weight: 5-10 parts of fluorine-containing acrylate monomer; 10-20 parts of cyclic ester acrylate monomer; 4-8 parts of polymerizable functional monomer containing polyphenol structure; 40-50 parts of acrylic ester soft monomer; 10-20 parts of acrylate hard monomer; The surface of the reactive modified nano silicon dioxide is provided with fluorine-containing chain segments and acryl groups which participate in double bond polymerization reaction, the metal ion complexing agent is carboxylate metal ion complexing agent or acetylacetonate metal ion complexing agent, the metal ion of the metal ion complexing agent is selected from Al 3+ 、Zr 4+ 、Ti 4+ or Zn 2+ , and the thermal initiator initiates double bond polymerization reaction.
  2. 2. The fluorine-containing adhesive for winding adhesive tapes according to claim 1, wherein the preparation method of the reactive modified nano-silica comprises the following steps: (1) The amino silane coupling agent and the fluorinated acrylic ester undergo aza-Michael addition reaction to obtain a product I; (2) Carrying out amidation reaction on the secondary amine of the product I and the acryloyl halide to obtain a product II; (3) And (3) dehydrating and condensing the silicon hydroxyl formed by hydrolyzing the product II under an acidic condition with the hydroxyl on the surface of the nano silicon dioxide to generate a silicon-oxygen bond, thus obtaining the reactive modified nano silicon dioxide.
  3. 3. The fluorine-containing adhesive for winding tapes according to claim 2, wherein the aminosilane coupling agent comprises one or more of silane coupling agent KH550, silane coupling agent KH540, and silane coupling agent KH 902.
  4. 4. A fluorine-containing adhesive for winding tapes according to claim 2, characterized in that the fluoroacrylate comprises one or both of perfluorooctyl (meth) acrylate or hexafluorobutyl (meth) acrylate.
  5. 5. The fluorine-containing adhesive for a winding tape according to claim 1, wherein the tackifying resin comprises one or more of hydrogenated rosin, hydrogenated rosin ester, and hydrogenated terpene resin.
  6. 6. The fluorine-containing adhesive for winding tapes according to claim 1, wherein the fluorine-containing acrylate monomer comprises one or more of perfluoroalkyl (meth) acrylates having a perfluoroalkyl chain of 6 to 12 carbon atoms.
  7. 7. The fluorine-containing adhesive for winding tapes according to claim 1, wherein the cyclic ester-based acrylate monomer is one or two of isobornyl (meth) acrylate.
  8. 8. The fluorine-containing adhesive for winding adhesive tapes according to claim 1, wherein the polymerizable functional monomer containing a polyphenol structure is prepared by ring-opening esterification reaction of carboxyl groups of gallic acid and epoxy groups of glycidyl methacrylate, and the structural formula of the polymerizable functional monomer containing a polyphenol structure is as follows: 。
  9. 9. The fluorine-containing adhesive for winding adhesive tapes according to claim 1, wherein the acrylic ester soft monomer comprises one or more of 2-ethylhexyl acrylate, n-butyl acrylate, isooctyl acrylate, isodecyl acrylate, lauryl acrylate and ethyl acrylate.
  10. 10. A winding adhesive tape suitable for pasting a low-polarity substrate, which is characterized by comprising a substrate layer, wherein an adhesive is arranged on the surface of the substrate layer, and the adhesive is the fluorine-containing adhesive for the winding adhesive tape obtained in any one of claims 1-9.

Description

Fluorine-containing adhesive for winding adhesive tape Technical Field The invention relates to the technical field of adhesives, in particular to a fluorine-containing adhesive for a winding adhesive tape. Background The winding adhesive tape is widely used in the industrial and civil fields of wire harness bundling, pipeline sealing, component fixing and the like due to the characteristics of convenient operation and strong adaptability. The core properties such as initial adhesion, peel strength and holding power are largely dependent on whether the adhesive layer is effectively wet on the surface of the adherend, firmly adheres thereto, and maintains its own cohesive stability. With the popularization of lightweight materials, low-polarity surface substrates such as polyolefin (e.g. polyethylene and polypropylene) are increasingly used in wire harnesses and pipelines. However, acrylate pressure-sensitive adhesives used in conventional wound tapes are generally high in surface energy and have insufficient wettability to such low polarity substrates. This results in difficulty in adequate spreading of the adhesive on the substrate surface, a small effective contact area, and thus lower peel strength. In practical application, edge lifting and rebound after bonding easily occur, or creep and bonding attenuation occur under complex working conditions such as damp heat, stress and the like, and the comprehensive requirements of initial viscosity, peel strength and holding viscosity are difficult to be considered. In response to the above problems, those skilled in the art generally resort to the following strategies for improvement: The wettability is improved by increasing the dosage of tackifying resin or increasing the proportion of soft monomers so as to reduce the modulus of the adhesive and enhance the spreading capability of the adhesive on the low-polarity surface, thereby improving the instant adhesive force. The cohesive force is enhanced by increasing the proportion of hard monomers, introducing chemical cross-linking agents or increasing the curing degree, so as to enhance the cohesive strength and creep resistance of the adhesive layer and improve the lasting adhesion and heat resistance performance. And (3) filler reinforcement, namely adding inorganic filler (such as silicon dioxide) into the adhesive system to improve the modulus and the shearing resistance of the adhesive layer. Surface treatment, namely corona and plasma treatment are carried out on the surface of an adherend (such as polyolefin) to improve the surface energy of the adherend and indirectly improve the adhesive force of the adhesive. However, the conventional means described above tend to have significant limitations in application. The adhesion-promoting resin or soft monomer is simply used for promoting wetting, so that the adhesive layer is easy to be excessively soft, the temperature resistance and creep resistance are reduced, and cohesive failure is easy to occur under the load or damp-heat condition. On the contrary, although the holding viscosity can be improved by adopting strong crosslinking or improving the proportion of hard segments, the fluidity of a polymer chain can be obviously reduced, the initial adhesion performance is damaged, and the bonding difficulty and the edge warping risk are increased. For filler reinforcement, common inorganic fillers are easy to agglomerate in an organic matrix, and have limited interfacial binding force with an acrylate matrix, so that stress concentration points are easy to form, and performance fluctuation is caused. The surface treatment is carried out on the adhered object, although the effect is direct, additional equipment and working procedures are required to be added, so that the cost is increased, the requirement of quick construction of the winding adhesive tape in a complex field environment is difficult to meet, the treatment effect can be attenuated with time, and the stability is poor. Disclosure of Invention The prior art has the problem that the conventional winding adhesive tape has poor bonding strength and bonding stability to polyolefin low-polarity surface base materials. Aiming at the problems, the invention provides a fluorine-containing adhesive for a winding adhesive tape, which comprises the following raw materials in parts by weight: 75-100 parts (or 79-98 parts) of acrylic monomer mixture; 5-10 parts of reactive modified nano silicon dioxide; 10-30 parts of tackifying resin; 0.5-1.0 part of thermal initiator; 0.5-2.0 parts of metal ion complexing agent; The acrylic monomer mixture is a free radical polymerizable polymerization monomer, and comprises the following raw materials in parts by weight: 5-10 parts of fluorine-containing acrylate monomer; 10-20 parts of cyclic ester acrylate monomer; 4-8 parts of polymerizable functional monomer containing polyphenol structure; 40-50 parts of acrylic ester soft monomer; 10-20 parts of acrylate hard monomer