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A kind of synergistically toughened modified cyanate ester resin and preparation method thereof

A technology of cyanate resin and thermoplastic resin, applied in the fields of synergistic toughening modified cyanate resin and preparation, high toughness modified cyanate resin and preparation, can solve the problem of reducing the heat resistance of cyanate resin, Cyanate ester resin has problems such as high reactivity and low heat resistance, and achieves the effect of improving dielectric properties and toughness, the best synergistic toughening effect, and good processability.

Active Publication Date: 2019-08-09
AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the high brittleness of epoxy resin itself, its toughening effect is relatively limited, and the heat resistance of epoxy resin itself is lower than that of cyanate resin. After the molecular structure of epoxy resin is embedded in the molecular structure of cyanate resin through copolymerization, Will reduce the heat resistance of cyanate ester resin
In addition, the cyanate ester resin modified by epoxy resin has high reactivity and is sensitive to heat. It is prone to polymerization reaction under thermal catalysis, and the viscosity changes greatly. It is not suitable for the preparation of prepreg by hot melt method or leads to Short pot life and lack of practicality
Prepreg is prepared by solvent method, which has backward technology, high production cost, serious environmental pollution and low production efficiency
[0004] The thermoplastic resin blending modified cyanate resin mainly utilizes the phase separation and phase inversion of the thermoplastic resin during the curing process of the cyanate resin, and the thermoplastic resin forms a sea-island-like discrete phase or a continuous phase in the cured product, which hinders the development of cracks. To improve toughness, in order not to reduce the heat resistance of the system, the thermoplastic resin used in this method generally has a high molecular weight and hardly contains reactive functional groups or has a very low concentration of reactive functional groups. Toughness effect, but after adding a large amount of thermoplastic resin, the viscosity of the resin increases sharply, the manufacturability deteriorates significantly, and even lacks practical value

Method used

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  • A kind of synergistically toughened modified cyanate ester resin and preparation method thereof
  • A kind of synergistically toughened modified cyanate ester resin and preparation method thereof
  • A kind of synergistically toughened modified cyanate ester resin and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] formula:

[0038] Bisphenol A cyanate: CY-1 cyanate (melting point 89°C), 100 parts by weight

[0039] Catalyst: 0.05 parts by weight

[0040] Reactive low molecular weight thermoplastic resin: polyphenylene ether, 8 parts by weight, molecular weight 1700g / mol, hydroxyl equivalent 790eq / g

[0041] Non-reactive high molecular weight thermoplastic resin: polyaryletherketone, 5 parts by weight, molecular weight 50000g / mol

[0042] Preparation Process:

[0043] The first step is to weigh a certain amount of CY-1 cyanate resin and heat it at 95°C to make the cyanate resin into a uniform liquid;

[0044] In the second step, the reactive polyphenylene ether resin is added in proportion, and the reactive polyphenylene ether resin is dissolved at (120-125) °C to obtain a uniform mixture A;

[0045] The third step is to add a catalyst to the mixture A in proportion, and react at (140-145) ° C for 2.5 hours to obtain a prepolymer B;

[0046] The fourth step is to add non-reac...

Embodiment 2

[0051] formula:

[0052] Bisphenol A cyanate: CY-1 cyanate (melting point 89°C), 100 parts by weight

[0053] Catalyst: 0.1 parts by weight

[0054] Reactive low molecular weight thermoplastic resin: polysulfone, 10 parts by weight, molecular weight 3500g / mol, hydroxyl equivalent 150eq / g.

[0055] Non-reactive high molecular weight thermoplastic resin: polyetherimide, 10 parts by weight, molecular weight 56000g / mol

[0056] The preparation process and the curing system of the modified cyanate ester resin are the same as in Example 1, and the properties of the cured product and the storage state of the prepreg at room temperature are shown in Table 2.

Embodiment 3

[0058] formula:

[0059] Phenolic cyanate: CY-5 cyanate (solid content greater than 95%), 100 parts by weight

[0060] Catalyst: 0.8 parts by weight

[0061] Reactive low molecular weight thermoplastic resin: polyetherimide, 15 parts by weight, molecular weight 4500g / mol, hydroxyl equivalent 68eq / g

[0062] Non-reactive high molecular weight thermoplastic resin: polysulfone, 12 parts by weight, molecular weight 45000g / mol

[0063] The preparation process and the curing system of the modified cyanate ester resin are the same as in Example 1, and the properties of the cured product and the storage state of the prepreg at room temperature are shown in Table 2.

[0064] Other formulations and properties are shown in Table 1:

[0065]

[0066]

[0067] According to the data in Tables 1 and 2, it can be seen that the tensile strength, tensile modulus, and elongation at break of the modified resin are related to the amount of thermoplastic resin B, and the glass transition t...

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Abstract

The invention provides synergistic toughened modified cyanate resin and a preparation method. The synergistic toughened modified cyanate resin is prepared from cyanate resin, a catalyst, thermoplastic resin A and thermoplastic resin B. According to the synergistic toughened modified cyanate resin, the thermoplastic resin A and the thermoplastic resin B are used for carrying out synergistic toughened modification on the cyanate resin; a reactive functional group and a cyanate functional group of reactive low-molecular-weight thermoplastic resin are used for reacting to extend a molecular chain; the regularity of the cyanate resin is damaged and the toughness of the cyanate resin is improved; the heat resistance and the dielectric property of the cyanate resin are not reduced; the low dielectric property and high heat resistance of non-reactive high-molecular-weight thermoplastic resin are utilized, and a disperse phase or a continuous phase is formed in a cyanate resin cured product, so that the dielectric property and toughness of the cyanate resin are improved.

Description

technical field [0001] The invention relates to a synergistically toughened modified cyanate resin and a preparation method, in particular to a high-toughness modified cyanate resin suitable for hot-melt prepregs and a preparation method, and belongs to the technical field of composite materials. Background technique [0002] Cyanate resin is a new type of resin developed and widely used in recent years. It has excellent mechanical properties, low dielectric constant, low dielectric loss tangent, high glass transition temperature, low thermal expansion coefficient and low of water absorption. It has been widely used in many fields such as multilayer printed circuit boards, high-speed substrates for optoelectronic devices, radar radomes, high-gain antennas, stealth aircraft, structural composite materials, and adhesives. [0003] The unmodified cyanate resin is a crystalline solid or a prepolymer solution at room temperature, which has poor manufacturability and high brittle...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L79/04C08L71/12C08L71/10
CPCC08L79/04C08L2201/08C08L2205/03C08L71/12C08L71/00
Inventor 欧秋仁嵇培军赵亮
Owner AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH