Patent Description:
With the rapid development of the electronics industry, an increasingly urgent need exists for highly transparent composite materials. For example, a conventional transparent composite material is as follows: a transparent resin composition, having an Abbe number of not less than <NUM> and including a transparent resin (a) and a glass filler (b). Further, the difference in refractive index between the transparent resin (a) and the glass filler (b) in the transparent resin composition is not more than <NUM>. The transparent resin (a) in the transparent resin composition is composed of at least one substance having a higher refractive index than that of the glass filler (b) and at least one substance having a lower refractive index than that of the glass filler (b). The glass filler (b) in the transparent resin composition has a refractive index of <NUM> to <NUM>. The transparent resin (a) in the transparent resin composition is a cross-linked acrylate resin having at least bifunctional (methyl) acrylate as the main component. The cross-linked acrylate resin contains (methyl) acrylate having an alicyclic structure as its constituent.

Although the conventional transparent composite material as mentioned above has improved light transmittance, its flexural strength is unsatisfactory. Related technologies are known from <CIT> and <CIT>. <CIT> discloses a resin composition for a transparent substrate, which comprises an epoxy resin (A) and a curing agent (B), wherein the curing agent (B) comprises a cyclohexane tricarboxylic acid anhydride. <CIT> discloses a resin composition including: (A) an epoxy resin, (B) an epoxy compound in a particular structure, (C) an epoxy compound in another particular structure, (D) a phenolic curing agent, and (E) a curing accelerator.

Accordingly, the main purpose of the present disclosure is to provide an epoxy resin composition and a transparent composite material comprising the same, and a laminated board. The composite material prepared from the epoxy resin composition provided in the present disclosure, a curing agent, and a curing accelerator as raw materials not only has high light transmittance, but also has high flexural strength.

Particular technical solutions include the follows.

An epoxy resin composition is provided, comprising an epoxy resin A and an epoxy resin B.

A refractive index of the epoxy resin A is <NUM> to <NUM> and a light transmittance of the epoxy resin A is greater than <NUM>%.

A refractive index of the epoxy resin B is <NUM> to <NUM> and a light transmittance of the epoxy resin B is greater than <NUM>%.

The epoxy resin A is an organosilicon modified epoxy resin and the epoxy resin B is another type of epoxy resin.

The organosilicon modified epoxy resin is at least one selected from a group consisting of hydroxyl-terminated polydimethylsiloxane modified epoxy resin, amino-terminated polydimethylsiloxane modified epoxy resin, and aminopropyl-terminated polydimethyldiphenylsiloxane modified epoxy resin.

The another type of epoxy resin is selected from a group consisting of bisphenol A epoxy resin, bisphenol F epoxy resin, and glycidyl ester epoxy resin.

In an embodiment, a mass ratio of the epoxy resin A to the epoxy resin B is (<NUM> to <NUM>):<NUM>.

In an embodiment, the mass ratio of the epoxy resin A to the epoxy resin B is (<NUM> to <NUM>):<NUM>.

An epoxy resin composite material is provided, comprising the epoxy resin composition as described above, a curing agent, and a curing accelerator.

In an embodiment, the curing agent is at least one selected from a group consisting of ethylenediamine, modified hexamethylenediamine, hexamethylenediamine adduct, dicyandiamide, diaminodiphenyl methane, and diaminodiphenyl sulfone.

In an embodiment, the curing accelerator is at least one selected from a group consisting of N,N-dimethylbenzylamine, triethylamine, N,N-dimethylaniline, imidazoles accelerator, and peroxides accelerator.

In an embodiment, the epoxy resin composite material further comprises an additional functional additive. The additional functional additive is at least one selected from a group consisting of an antioxidant, an anti-ultraviolet additive, a dispersant, and a diluent.

A method for preparing the epoxy resin composite material as described above, comprising:
providing the epoxy resin composition, the curing agent, the curing accelerator, and a solvent, and mixing them.

In an embodiment, the solvent is dimethylformamide and/or propylene glycol methyl ether.

A prepreg is provided, which is made from a raw material comprising a glass filler and a resin material. The resin material is made from a raw material comprising the epoxy resin composition as described above or the epoxy resin composite material as described above.

A method for preparing the prepreg as described above is provided, comprising:
impregnating the glass filler into the resin material, and heating.

In an embodiment, a temperature for the heating is <NUM> to <NUM> and a time for the heating is <NUM> minutes to <NUM> minutes.

A laminated board is provided, comprising a laminate of a prepreg which is made from a raw material comprising the epoxy resin composition as described above or the epoxy resin composite material as described above, or which is the prepreg as described above.

In an embodiment, the laminate is further coated with a release film on one or both sides thereof.

A method for preparing the laminated board as described above is provided, comprising: providing the prepreg, and laminating the prepreg followed by hot pressing under vacuum.

In an embodiment, conditions for the hot pressing under vacuum comprise a temperature of <NUM> to <NUM>, a pressure of <NUM> kgf/cm<NUM> to <NUM> kgf/cm<NUM>, and a hot pressing time of <NUM> minutes to <NUM> minutes.

In an embodiment, the preparing method further comprises: coating a release film on one or both sides of a laminate obtained in the laminating.

Compared to the relevant art, the present disclosure has the following beneficial effects.

In the present disclosure, the organosilicon modified epoxy resin satisfying a specific condition (i.e., <NUM> to <NUM> and a light transmittance greater than <NUM>%) and another type of epoxy resin also satisfying this specific condition are combined to form a specific epoxy resin composition. A composite material prepared from the epoxy resin composition, a curing agent, and a curing accelerator has advantages of high light transmittance and high flexure strength, and also has high bonding strength.

In order to facilitate the understanding of the present disclosure, the below will make a complete description of the present disclosure. However, the present disclosure can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, these embodiments are provided to make the understanding of the disclosure content of the present disclosure more thorough and comprehensive.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art of the present disclosure. The terms used in the description of the present disclosure are merely for the purpose of describing specific embodiments, and are not intended to limit the present disclosure.

An epoxy resin composition is provided in embodiments of the present disclosure. The epoxy resin composition includes an epoxy resin A and an epoxy resin B.

A refractive index of the epoxy resin A is <NUM> to <NUM>, and a light transmittance of the epoxy resin A is greater than <NUM>%.

A refractive index of the epoxy resin B is <NUM> to <NUM>, and a light transmittance of the epoxy resin B is greater than <NUM>%.

The epoxy resin A is an organosilicon modified epoxy resin, and the epoxy resin B is another type of epoxy resin.

In an example, the refractive index of the epoxy resin A is <NUM>, and the light transmittance of the epoxy resin A is <NUM>%. The refractive index of the epoxy resin B is <NUM>, and the light transmittance of the epoxy resin B is <NUM>%.

In an example, the organosilicon modified epoxy resin is at least one selected from a group consisting of hydroxyl-terminated polydimethylsiloxane modified epoxy resin (a refractive index of <NUM> and a light transmittance of <NUM>%), polymethylphenylsiloxane modified epoxy resin (a refractive index of <NUM> and a light transmittance of <NUM>%), amino-terminated polydimethylsiloxane modified epoxy resin (a refractive index of <NUM> and a light transmittance of <NUM>%), and aminopropyl-terminated polydimethyldiphenylsiloxane modified epoxy resin (a refractive index of <NUM> and a light transmittance of <NUM>%).

In an example, the another type of epoxy resin is selected from a group consisting of bisphenol A epoxy resin (a refractive index of <NUM> and a light transmittance of <NUM>%), bisphenol F epoxy resin (a refractive index of <NUM> and a light transmittance of <NUM>%), glycidyl ester epoxy resin (a refractive index of <NUM> and a light transmittance of <NUM>%), and polyphenolic glycidyl ether epoxy resin (a refractive index of <NUM> and a light transmittance of <NUM>%).

In an example, a mass ratio of the epoxy resin A to the epoxy resin B is (<NUM> to <NUM>):<NUM>.

In an example, the mass ratio of the epoxy resin A to the epoxy resin B is (<NUM> to <NUM>):<NUM>.

An epoxy resin composite material is provided in embodiments of the present disclosure. The epoxy resin composite material includes the epoxy resin composition as described above, a curing agent, and a curing accelerator.

It should be understood that, in order to achieve an ideal curing effect, appropriate amounts of the curing agent and the curing accelerator can be selected. In an example, the epoxy resin composite material provided in embodiments of the present disclosure, in parts by mass, includes:.

It should be understood that, in order to achieve an ideal curing effect, appropriate types of the curing agent and the curing accelerator can be selected.

In an example, the curing agent is at least one selected from a group consisting of ethylenediamine, modified hexamethylenediamine, hexamethylenediamine adduct, dicyandiamide, diaminodiphenyl-methane, and diaminodiphenylsulfone.

In an example, the curing accelerator is at least one selected from a group consisting of N,N-dimethylbenzylamine, triethylamine, N,N-dimethylaniline, imidazoles accelerator and peroxides accelerator.

In an example, the epoxy resin composite material further includes an additional functional additive. The additional functional additive described in the embodiments of the present disclosure includes, but not limited to, an antioxidant, an anti-ultraviolet additive, a dispersant, a diluent, or other additives. In an embodiment of the present disclosure, the antioxidant is, for example, antioxidant <NUM> or other antioxidant. The anti-ultraviolet additive is, for example, ultraviolet absorber UV-<NUM>. The dispersant is, for example, dispersant <NUM>. The diluent is, for example, allyl glycidyl ether.

A method for preparing the epoxy resin composite material as described above is provided in embodiments of the present disclosure, which includes steps of:
providing the epoxy resin composition, the curing agent, the curing accelerator, and a solvent, and mixing them.

In an example, the solvent is dimethylformamide and/or propylene glycol methyl ether. Preferably, the solvent is dimethylformamide.

It should be understood that, the amount of the solvent in the embodiments of the present disclosure is not specifically limited. For example, <NUM> to <NUM> parts of the solvent is used in the preparation of the epoxy resin composite material having the following formulation: <NUM> to <NUM> parts of the epoxy resin A, <NUM> to <NUM> parts of the epoxy resin B, <NUM> to <NUM> parts of the curing agent, and <NUM> to <NUM> parts of the curing accelerator.

A prepreg is provided in embodiments of the present disclosure. The prepreg is made from a raw material including a glass filler and a resin material. The resin material is made from a raw material including the epoxy resin composition as described above or the epoxy resin composite material as described above.

The glass filler in the embodiments of the present disclosure includes, but is not limited to, glass fiber fabric such as <NUM> glass fiber fabric (a basis weight of <NUM>/m<NUM>).

A method for preparing the prepreg as described above is provided in embodiments of the present disclosure, which includes steps of:
impregnating the glass filler into the resin material, and heating.

In an example, a temperature for the heating is <NUM> to <NUM>, and a time for the heating is <NUM> minutes to <NUM> minutes.

A laminated board is provided in embodiments of the present disclosure. The laminated board includes a laminate of a prepreg. The prepreg is made from a raw material including the epoxy resin composition as described above or the epoxy resin composite material as described above. Alternatively, the prepreg is the prepreg as described above.

In an example, the laminate is coated with a release film on one or both sides thereof.

A method for preparing the laminated board as described above is provided in embodiments of the present disclosure, which includes steps of: providing the prepreg, and laminating the prepreg followed by hot pressing under vacuum.

In an example, conditions for the hot pressing under vacuum include: a temperature of <NUM> to <NUM>, a pressure of <NUM> kgf/cm<NUM> to <NUM> kgf/cm<NUM>, and a hot pressing time of <NUM> minutes to <NUM> minutes.

In an example, the method further includes coating a release film on one or both sides of a laminate obtained in the laminating.

This comparative example is a comparative example of Example <NUM>. The difference from Example <NUM> is in that diphenylsilanediol modified epoxy resin having a refractive index of <NUM> and a light transmittance of <NUM>% is used to replace hydroxyl-terminated polydimethylsiloxane modified epoxy resin in Example <NUM>.

This comparative example is a comparative example of Example <NUM>. The difference from Example <NUM> is in that phenolic epoxy resin having a refractive index of <NUM> and a light transmittance of <NUM>% is used to replace the bisphenol A epoxy resin in Example <NUM>.

This comparative example is a comparative example of Example <NUM>. The difference from Example <NUM> is in that polycarbonate, as a non-organosilicon modified epoxy resin, having a refractive index of <NUM> to <NUM> and a light transmittance greater than <NUM>% is used to replace the organosilicon modified epoxy resin in Example <NUM>.

The laminated boards in Examples and Comparative Examples as described above were respectively taken for performing the following tests.

Laminated boards obtained from Example <NUM> and Example <NUM> were tested with reference to performance test method as described above. The results are shown in the following table.

Claim 1:
An epoxy resin composition, characterized by comprising an epoxy resin A and an epoxy resin B;
wherein a refractive index of the epoxy resin A is <NUM> to <NUM> and a light transmittance measured as defined in the description of the epoxy resin A is greater than <NUM>%;
wherein a refractive index of the epoxy resin B is <NUM> to <NUM> and a light transmittance measured as defined in the description of the epoxy resin B is greater than <NUM>%; and
wherein the epoxy resin A is an organosilicon modified epoxy resin and the epoxy resin B is another type of epoxy resin;
wherein the organosilicon modified epoxy resin is at least one selected from a group consisting of hydroxyl-terminated polydimethylsilane modified epoxy resin epoxy resin, amino-terminated polydimethylsiloxane modified epoxy resin, and aminopropyl-terminated dimethyldiphenylsiloxane modified epoxy resin, and the another type of epoxy resin is selected from a group consisting of bisphenol A epoxy resin, bisphenol F epoxy resin, and glycidyl ester epoxy resin.