Adhesive, die attach film and preparation method therefor
Embodiments of the present application disclose an adhesive, a die attach film and a preparation method therefor, and relate to the technical field of chip packaging. The adhesive includes epoxy resin, phenoxy resin, an indene oligomer, filler and a curing agent; and 20-60 parts of the epoxy resin, 20-30 parts of the phenoxy resin, 5-10 parts of the indene oligomer, 15-30 parts of the filler and 1-5 parts of the curing agent are provided in parts by mass. The present application further provides the die attach film and the preparation method therefor. In the adhesive provided by the present application, the epoxy resin, the phenoxy resin and the indene oligomer are used as curable substrates to improve a thermal stress obtained after the adhesive is cured, so that the die attach film prepared therefrom is not easy to warp in a temperature change process.
1. An adhesive, comprising epoxy resin, phenoxy resin, an indene oligomer, filler and a curing agent; and 20-60 parts of the epoxy resin, 20-30 parts of the phenoxy resin, 5-10 parts of the indene oligomer, 15-30 parts of the filler and 1-5 parts of the curing agent are provided in parts by mass;
wherein the indene oligomer has a chemical structural formula shown as:
wherein n and m are integers, 1≤n≤10, and 1≤m≤6; and
a weight-average molecular weight of the phenoxy resin is within a range of 30000-60000.
2. The adhesive of claim 1 , wherein the epoxy resin comprises bisphenol epoxy resin, polyurethane-modified epoxy resin and naphthalene ring epoxy resin; and
a mass ratio of the bisphenol epoxy resin to the polyurethane-modified epoxy resin to the naphthalene ring epoxy resin is 1:(1-2):(0.25-0.67).
3. The adhesive of claim 2 , wherein an epoxy equivalent of the bisphenol epoxy resin is 160-180 g/eq; and/or
an epoxy equivalent of the polyurethane-modified epoxy resin is 210-250 g/eq.
4. The adhesive of claim 2 , wherein the bisphenol epoxy resin is selected from one or more of bisphenol-F epoxy resin, bisphenol-S epoxy resin and bisphenol-A epoxy resin.
5. The adhesive of claim 1 , wherein the adhesive further comprises an accelerator, and 0.1-0.5 part of the accelerator is provided in parts by mass.
6. The adhesive of claim 5 , wherein the accelerator is selected from an imidazole curing accelerator and an amine curing accelerator.
7. The adhesive of claim 1 , wherein 45-50 parts of the epoxy resin, 25-30 parts of the phenoxy resin, 8-10 parts of the indene oligomer, 20-25 parts of the filler and 2-3 parts of the curing agent are provided in parts by mass.
8. The adhesive of claim 1 , wherein the curing agent is selected from one or more of dicyandiamide, a naphthol curing agent and phenolic resin.
9. A die attach film, being prepared from the adhesive of claim 1 .
10. A preparation method for the die attach film of claim 9 , comprising:
providing raw materials of the adhesive of claim 1 ; and
after the raw materials are mixed, performing flattening and drying to obtain the die attach film.