Novel benzoxazine latency adhesive

A benzoxazine and latent technology, which is applied in the field of new benzoxazine curing system and its preparation as a latent adhesive, can solve the problem of high product brittleness, restrictions on large-scale production and application, and long time problem, to achieve the effect of enhanced tensile strength at break, good liquid fluidity, and improved mechanical properties

Inactive Publication Date: 2017-08-18
ZHEJIANG SCI-TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above issues have adverse effects on many industrial applications, so the development of storage-stable and medium-temperature fast-curing latent adhesives is still challenging.
[0003] Recently, studies have found that benzoxazine, as a new type of phenolic resin, can be bonded and cured like epoxy resin (Acuring system of benzoxazine with amine: reactivity, reaction mechanism and material properties), and benzoxazine has good environmental effects, During the curing process, it has the advantages of zero volume shrinkage, high heat resistance and carbon residue rate, and flexible molecular structure, but its disadvantages such as solid at room temperature, high self-polymerization temperature and long time, and high brittleness of the product severely limit its size. Scale production and application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The bisphenol F type benzoxazine synthesized from bisphenol F, paraformaldehyde and octylamine was dissolved in octyldiamine, wherein the molar ratio of benzoxazine and amine was 1:1 to obtain latent viscous Adhesive. Gels rapidly at high temperature, at 120 ° The gel time at C is about 900 s, and at 150 ° The gel time under C is about 200 s. Apply the adhesive evenly on the aluminum sheet with an area of ​​10 mm × 20 mm, then sprinkle a very small amount of glass beads (0.2 mm in diameter), and then press another sheet of the same substrate together, secured with clips, at 120 ° C, 150 ° C and 180 ° They were heated at C for 2 hours, taken out, and placed at room temperature for 24 hours, and the tensile breaking strength was measured to be 168 Mpa. After compounding the adhesive with 4 layers of filter paper (10 mm*30 mm) at 120 ° C, 150 ° C and 180 ° C respectively heating 2h, the storage modulus of the obtained material is 4.5 GPa. at room temperature 25 o...

Embodiment 2

[0019] Dissolve bisphenol F type benzoxazine synthesized from bisphenol F, paraformaldehyde and cyclohexylamine in cyclohexanediamine, wherein the molar ratio of benzoxazine and amine is 1:1 to obtain latent sex adhesive. Gels rapidly at high temperature, at 120 ° The gel time at C is about 1350 s, at 150 ° The gel time under C is about 420 s. The adhesive is evenly spread on the aluminum sheet with an area of ​​10 mm × 20 mm, and then sprinkled with a very small amount of glass beads (0.2 mm in diameter), and then another piece of the same substrate Pressed together, secured with clips, at 120 ° C, 150 ° C and 180 ° They were heated at C for 2 hours, taken out, and placed at room temperature for 24 hours, and the tensile breaking strength was measured to be 125 Mpa. After compounding the adhesive with 4 layers of filter paper (10 mm*30 mm) at 120 ° C, 150 ° C and 180 ° C respectively heated for 2h, the storage modulus of the obtained material is 4.1 GPa. at room temp...

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Abstract

The invention discloses a novel benzoxazine latency adhesive which consists of bisphenol F-type benzoxazine and diamine. The preparation process is that the bisphenol F-type benzoxazine is dissolved in liquid diamine of a similar structure. When being used, the novel benzoxazine latency adhesive can be rapidly cured when being heated, the novel benzoxazine latency adhesive is simple in preparation process, long in preservation period, high in product modulus after being cured, remarkably improved in breaking tensile strength, and can be widely applied to fields such as buildings, transportation and industry.

Description

technical field [0001] The invention relates to a novel benzoxazine curing system and a preparation method thereof as a latent adhesive, belonging to the fields of polymer materials, latent adhesives, and the like. Background technique [0002] Traditional adhesives are generally composed of epoxy resin and curing agent, which not only need to be stored separately, but also will be cured immediately after preparation, so there are problems such as storage and transportation difficulties, errors and uneven mixing during preparation. Therefore, latent adhesives that are easy to use and process controllable have become a research hotspot. Mixing liquid epoxy compound with particulate curing agent is one of the most successful ways to prepare latent adhesives. The curing agents in patents CN 103665324A and CN102268126A are all solid, but the fluidity and viscosity of the curing agent particles on the curing mixture There are adverse effects, so diluents with good fluidity and l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J179/04C09J11/06C08G73/06
CPCC09J11/06C09J179/04C08G73/06C08K5/17
Inventor 刘向东赵阳王骏付飞亚
Owner ZHEJIANG SCI-TECH UNIV
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