JPH06322071A - Thermosetting resin composition - Google Patents

Abstract

PURPOSE:To obtain a thermosetting resin composition excellent in heat resistance, mechanical strengths and processability. CONSTITUTION:This resin composition comprises an aromatic polyamide oligomer having polymerizable unsaturations at both the terminals or in the side chains, a maleimide compound, N,N,N',N'-tetraglycidyl-m-xylenediamide and/or 1,3-bis-(N,N-diglycidylaminomethyl)cyclohexane, and glass fibers.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a novel thermosetting resin composition having excellent heat resistance, mechanical strength and processability.

[0002]

2. Description of the Related Art Conventionally, a thermosetting resin having an imide structure has been widely used industrially because it has excellent electrical insulating properties, heat resistance, and dimensional stability of molded products. However, the thermosetting resin using an aromatic bismaleimide is a material that is insoluble and infusible and has excellent heat resistance, but has a drawback that it is poor in workability, impact resistance and toughness. Therefore, as a method for improving the impact resistance and toughness of the aromatic bismaleimide, there is an attempt to use an aromatic diamine for the aromatic bismaleimide. For example, polyamino bismaleimide resin (manufactured by Rhone Boulan, trade name Kinel) consisting of N, N '-(4,4'-methylenediphenylene) bismaleimide and 4,4'-diaminodiphenylmethane is impact resistant and Since the toughness is superior to the aromatic bismaleimide alone,
As a molded product, it is widely used for structural members, sliding members, and the like. However, these thermosetting resins have not been satisfactory in terms of impact resistance and toughness.

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to provide a thermosetting resin composition which maintains conventional heat resistance and is excellent in workability, impact resistance and toughness.

[0004]

According to the present invention, there is provided a thermosetting resin composition which can achieve the above objects.

That is, according to the present invention, (a) an aromatic polyamide oligomer having a polymerizable unsaturated group at both ends or side chains, (b) maleimide compound, (c) N, N, N ',
N'-tetraglycidyl m-xylenediamine and /
Alternatively, it relates to a thermosetting resin composition containing 1,3-bis (N, N-diglycidylaminomethyl) cyclohexane and (d) glass fiber.

The aromatic polyamide oligomer having a polymerizable unsaturated group at both ends or side chains used in the present invention is, for example, an aromatic diamine, an aliphatic monoamine having a terminal unsaturated group and an aromatic dicarboxylic acid dihalide. Method of reacting in the presence of hydrogen halide acceptor
(JP-A-2-218711), a method of reacting an aromatic diamine, an aromatic monoamine having a terminal unsaturated group and an aromatic dicarboxylic acid dihalide in the presence of a hydrogen halide acceptor (JP-A-3-21636). ), An aromatic diamine, an organic acid halide having an internal unsaturated group, and an aromatic dicarboxylic acid dihalide are reacted in the presence of a hydrogen halide acceptor (JP-A-3-50219), an aromatic diamine, a terminal diamine. A method of reacting an organic acid halide having a saturated group and an aromatic dicarboxylic acid dihalide in the presence of a hydrogen halide acceptor (JP-A-3-5-5).
No. 0217), aromatic diamine, aromatic dicarboxylic acid dihalide, N- (hydroxyphenyl) cyclic unsaturated imide or N- (hydroxyalkyl) cyclic unsaturated imide in the presence of a hydrogen halide acceptor ( JP-A-3-277629), a method of reacting an aromatic diamine, a maleimide and an aromatic dicarboxylic acid dihalide in the presence of a hydrogen halide acceptor (JP-A-3-185016), an aromatic diamine, an aromatic dicarboxylic acid. Method for reacting acid dihalide and unsaturated alcohol or unsaturated phenol in the presence of hydrogen halide acceptor (JP-A-3-252410), aromatic diamine, (meth) acrylamide and aromatic dicarboxylic acid dihalide halogenated Method of reacting in the presence of hydrogen acceptor Can be used those synthesized by 3-166210 JP) method or the like.

In the present invention, the maleimide compound used by mixing with the above-mentioned polyamide oligomer includes (i) phenylmaleimides (ii) dimaleimides synthesized from aromatic diamine and maleic anhydride (iii) Polymaleimides synthesized from polyamines such as aniline-formaldehyde condensate and maleic anhydride Further, it is possible to use a mixture of (i), (ii) and (iii). Phenylmaleimides have a low melting point and have a wide compatibility with aromatic polyamide oligomers, but there is a point that they are slightly lacking in heat resistance. Therefore, dimaleimides made from aromatic diamines are generally used.

Examples of these are N-phenylmaleimide, N- (O-chlorophenyl) maleimide, N, N '.
-Diphenylmethane bismaleimide, N, N'-diphenyl ether bismaleimide, N, N'-paraphenylene bismaleimide, N, N '-(2-methylmetaphenylene) bismaleimide, N, N'-metaphenylene bismaleimide, N , N '-(3,3'-dimethyldiphenylmethane) bismaleimide, N, N'-(3,3'-diphenylsulfone) bismaleimide or a maleimide compound of an aniline-formaldehyde condensate.

The aromatic polyamide oligomer having a polymerizable unsaturated group at both terminals or side chains (including phthalamide such as diallyl isophthalamide) of the present invention generally has a slow curing rate and uses a radical generator as a catalyst. Even if it is necessary to heat it to a high temperature for a long time, the curing rate can be improved by adding a maleimide compound. Further, it has the effect of improving the moldability (decreasing the melting point) of the composition containing the maleimide compound before curing and the effect of enabling processing at low pressure.
The mixing ratio of the aromatic polyamide oligomer and the maleimide compound is 100 parts by weight of the aromatic polyamide oligomer,
Maleimide compound 10 to 200 parts by weight, preferably 10
~ 150 parts by weight. Add 1 maleimide compound
When the amount is less than 0 parts by weight, the heat resistance is good, but the drop in the melting point is small and the effect of improving the moldability becomes small. Also, 20
Even if the amount is more than 0 parts by weight, the melting point shows a substantially constant value, no further decrease in melting point is observed, and further, the heat resistance is lowered, and at the same time, the polymerization reaction becomes violent and uncontrollable. is there.

The N, N, N ', N'-tetraglycidyl m-xylylenediamine and 1,3-bis (N, N-diglycidylaminomethyl) cyclohexane of the present invention are 1) Adhesion between glass fiber and resin And the mechanical properties of the molded product are improved, and at the same time, 2) the softening point of the composition is lowered, which is effective in improving the processability. The addition amount is 5 to 150 parts by weight, preferably 10 to 100 parts by weight, based on 100 parts by weight of the mixture of the aromatic polyamide oligomer and the maleimide compound. If the amount of N, N, N ', N'-tetraglycidyl m-xylylenediamine and 1,3-bis (N, N-diglycidylaminomethyl) cyclohexane added is less than 5 parts by weight, the heat resistance is good. The effect of improving the adhesion between the glass fiber and the base resin of the present invention and improving the mechanical properties of the molded article is small, and at the same time, the softening point of the composition is small and the effect of improving the moldability is small. Further, even if the amount is more than 150 parts by weight, not only further improvement in adhesiveness between glass fiber and resin and moldability is not observed, but there is also a problem that heat resistance is lowered.

The glass fiber of the present invention is obtained by drawing molten glass by various methods and then rapidly cooling it to form a fine fiber having a predetermined diameter. Strands obtained by bundling single fibers with a sizing agent are uniform. It means a roving or the like which is bundled together and is used in the present invention. The glass fiber may use a silane coupling agent such as aminosilane or epoxysilane, a chromic chloride, or a surface treatment agent depending on the purpose in order to have an affinity with the base resin of the present invention. The length of the glass fiber in the present invention greatly affects the physical properties of the obtained molded product and the workability at the time of manufacturing the molded product. Generally, as the glass fiber length increases, the physical properties of the molded product improve, but conversely, the workability during the manufacturing of the molded product deteriorates. For this reason,
In the present invention, the glass fiber having a length of 0.1 to 6 mm, preferably 0.1 to 4 mm is suitable because the physical properties and workability of the molded product are well balanced.

The glass fiber in the present invention is 10 to 3 with respect to 100 parts by weight of the base resin [(a), (b), (c)].
00 parts by weight, preferably 20 to 250 parts by weight can be used. If it is less than 10 parts by weight, the reinforcing effect peculiar to the glass fiber characteristic of the present invention cannot be obtained. On the other hand, if it is used in an amount of more than 300 parts by weight, the fluidity of the composition at the time of molding becomes poor and it becomes difficult to obtain a satisfactory molded product.

The base resin of the present invention, that is, the aromatic polyamide oligomer having a polymerizable unsaturated group at both terminals or side chains of the component (a), the maleimide compound of the component (b), and the N of the component (c). , N, N ', N'-tetraglycidyl m-xylenediamine and / or 1,3-
The mixing ratio of bis (N, N-diglycidylaminomethyl) cyclohexane is 5 to 60 parts by weight, preferably 20 to 50 parts by weight, when the total amount of the composition is 100 parts by weight.
Parts by weight, (b) component 5 to 70 parts by weight, preferably 20 to
50 parts by weight, 2.5 to 60 parts by weight of the component (c), preferably 5 to 50 parts by weight. Further, the mixing ratio of the component (a) and the component (b) is preferably 6: 4 to 4: 6 by weight.

The mixing ratio of the component (a) is less than 5 parts by weight,
When the mixing ratio of the component (B) is less than 5 parts by weight, the adhesiveness is good, but the heat resistance is problematic. On the other hand, (a)
When the mixing ratio of the components exceeds 60 parts by weight and when the mixing ratio of the component (b) exceeds 70 parts by weight, the heat resistance is good but the adhesiveness does not reach a satisfactory level. If the mixing ratio of the component (c) is less than 2.5 parts by weight, the adhesion to the glass fiber is poor, while if the mixing ratio of the component (c) exceeds 60 parts by weight, the heat resistance is poor. Also, (a)
The mixing ratio of the component (b) to the component (b) is 6: 4 to 4: 6 by weight.
However, when the mixing ratio of the component (a) exceeds 6 by weight, the crosslinking density is lowered and the physical heat resistance is lowered. On the other hand, the mixing ratio of the component (b) is 6 by weight.
When it exceeds, the crosslink density is increased and the physical heat resistance is improved, but the cured product is fragile.

The thermosetting resin composition according to the present invention can be produced by a generally known method, but the following method is particularly preferable.

(1) (a) Aromatic polyamide oligomer having a polymerizable unsaturated group at both ends or side chains,
(B) Maleimide compound, (c) N, N, N ', N'-
Tetraglycidyl m-xylylenediamine and / or 1,3-bis (N, N-diglycidylaminomethyl) cyclohexane, and (d) glass fiber using a mortar, Henschel mixer, drum blender, tumbler blender, ball mill, etc. After mixing and kneading with a melt mixer, a hot roll or the like as necessary, pellets or powder are formed.

(2) (a) Aromatic polyamide oligomer having a polymerizable unsaturated group at both ends or side chains,
(B) Maleimide compound, (c) N, N, N ', N'-
Tetraglycidyl m-xylylenediamine and / or 1,3-bis (N, N-diglycidylaminomethyl) cyclohexane are previously dissolved or suspended in an organic solvent, and glass fibers are immersed in this solution or suspension, After that, the solvent is removed with a hot air dryer, and then pelletized or powdered.

The thermosetting resin composition according to the present invention can be cured by the combined use of a radical generating catalyst, and the heat resistance can be remarkably improved. There is no particular limitation on the radical generating catalyst, but the molding temperature is 1
When the temperature is 00 ° C. or higher, a so-called high temperature decomposition type, for example, dicumyl peroxide type is used. The amount used is suitably 0.5 to 3 phr. Further, the thermosetting resin composition according to the present invention, for the purpose of further curing and adjustment of resin stability, hydroquinone, benzoquinone, copper salt,
Known publicly known compounds such as tetramethylthiuram compound and nitrophenylhydroxy compound can be blended.

[0019] To the composition of the present invention, within a range that does not impair the object of the present invention, 1 or more usual additives such as an antioxidant and a heat stabilizer, an ultraviolet absorber, an antistatic agent, a lubricant and a coloring agent are added. More than one species can be added. In addition, carbon fibers, aromatic polyamide fibers, alumina fibers, potassium titanate fibers and other reinforcing materials and clay, mica, graphite, glass beads, alumina fused silica and other fillers should be added in appropriate amounts according to the purpose. Is also possible.

The thermosetting resin composition of the present invention is molded by a known molding method such as a compression molding method, a transfer molding method, an extrusion molding method or an injection molding method, and put into practical use.

[0021]

The present invention will be described in more detail with reference to the following examples.

Synthesis Example 1

[Chemical 1] Synthesis of aromatic polyamide oligomer [I] shown in 1. In a 1-liter four-necked separable flask equipped with a reflux condenser, a dropping funnel, a thermometer, and a stirrer, 16.92 g (0.083 mol of isophthalic acid dichloride) was added. ), N, N-
Charge 100 g of dimethylformamide (DMF), 1
Cool to below 0 ° C. Next, 20 g (0.1 mol) of 3,4'-diaminodiphenyl ether (3,4'-DAPE),
20.2 g (0.2 mol) of triethylamine, DMF7
5 g are weighed and mixed, and added dropwise to a separable flask. Then, methacrylic acid chloride 3.483 g (0.033
Mol) and 25 g of DMF are weighed and mixed, and added dropwise to a separable flask. Meanwhile, the temperature of the reaction mixture is kept below 10 ° C. After completion of the dropping, the temperature of the reaction mixture is kept at 10 ° C. or lower and stirring is continued for 2 hours. Next, the reaction mixture is gradually added to a large amount of water with vigorous stirring to precipitate crystals. The precipitated crystals are suction filtered, washed with water and dried.
The melting point of the product was 145-160 ° C.

Synthesis Example 2

[Chemical 2] 50 equipped with a stirrer, a thermometer, a reflux condenser, and a nitrogen inlet pipe for synthesizing the aromatic polyamide oligomer [II]
Isophthalic acid 16.6 in a 0 ml separable flask
g, methacrylic acid 3.44 g, tolylene-2,4-diisocyanate / tolylene-2,6-diisocyanate (8
0/20) 20.88 g, DMF 200 g, and toluquinone 0.01 g were charged, and the temperature was gradually raised to 110 ° C. with stirring while passing nitrogen gas. After the temperature was raised, the reaction was continued at 110 ° C. for 6 hours and then cooled to room temperature. The infrared absorption spectrum of the obtained polymer solution was measured, but no absorption by the NCO functional group was observed. This polymer solution is gradually added to a large amount of water with vigorous stirring to precipitate crystals. The precipitated crystals are then suction filtered, washed with water and dried. The melting point of the product was 210-250 ° C.

Example 1 Aromatic polyamide oligomer [I] synthesized in Synthesis Example 1
39 g, N, N'-diphenylmethane bismaleimide 3
9 g, N, N, N ', N'-tetraglycidyl m-xylenediamine 22 g, zinc stearate 3 g, glass powder (EPG140M-80A; Nippon Electric Glass Co., Ltd. product) 200 g, dicumyl peroxide 2 g, hydroquinone 0 0.05 g was weighed and mixed with stirring until uniform. The above mixture was kneaded with a hot roll heated to 120 ° C. for 12 minutes to obtain a sheet-like uniform composition. This sheet-shaped composition was cooled, then pulverized, compression-molded under the following molding conditions, and the bending strength was measured. Molding conditions: preheating 80 ° C, 30 minutes; molding temperature 160
C. Molding time 20 minutes; Molding pressure 50 kg / cm ² Post-curing 180 ° C., 5 hours Bending strength: Before post-curing 11.0 kg / mm ² ; Post-curing 15.
5 kg / mm ² Flexural modulus: post cure before 1470 kg / mm ^2; postcured after 146
0 kg / mm ²

Example 2 Example 1 except that 200 g of glass powder was changed to 150 g
The same operation was performed. Bending strength: Before post-curing 13.6 kg / mm ² ; After post-curing 15.
0 kg / mm ² Flexural modulus: post cure before 1320kg / mm ^2; postcured after 129
0 kg / mm ²

Example 3 Example 1 except that 200 g of glass powder was changed to 100 g.
The same operation was performed. Bending strength: Before post-curing 11.8 kg / mm ² ; After post-curing 11.
2 kg / mm ² Flexural modulus: post cure before 1060kg / mm ^2; postcured after 116
0 kg / mm ²

Example 4 Aromatic polyamide oligomer [I] synthesized in Synthesis Example 1
33.4 g, N, N'-diphenylmethane bismaleimide 33.3 g, N, N, N ', N'-tetraglycidyl m-
33.3 g of xylene diamine, 3 g of zinc stearate,
Glass powder 200g, dicumyl peroxide 2
g, Example 1 except that 0.05 g of hydroquinone was used
The same operation was performed. Bending strength: before post-curing 10.4 kg / mm ² ; after post-curing 14.
9 kg / mm ² Flexural modulus: post cure before 1350 kg / mm ^2; postcured after 136
0 kg / mm ²

Example 5 Aromatic polyamide oligomer synthesized in Synthesis Example 2 [I
I] The same operation as in Example 1 was performed except that 39 g was used. Bending strength: Before post-curing 13.2 kg / mm ² ; After post-curing 15.
3 kg / mm ² Flexural modulus: post cure before 1450kg / mm ^2; postcured after 147
0 kg / mm ²

Example 6 Aromatic polyamide oligomer [I] synthesized in Synthesis Example 1
17.5 g, N, N'-diphenylmethane bismaleimide 17.5 g, N, N, N ', N'-tetraglycidyl m
-Xylenediamine 10g, 1/8 inch glass fiber 4
5 g was weighed and mixed by stirring. Next, 55 g of acetone in which 0.9 g of dicumyl peroxide was dissolved was added, and the mixture was kneaded at room temperature and uniformly mixed. The mixture was put in a hot air dryer at 50 ° C. and dried for 10 hours to obtain a cotton-like composition. The dried cotton-like composition was compression-molded under the following conditions, and the bending strength was measured. Molding conditions: preheating 80 ° C, 30 minutes; molding temperature 160
C. Molding time 20 minutes; Molding pressure 50 kg / cm ² Post-curing 180 ° C., 5 hours Bending strength: Before post-curing 11.4 kg / mm ² ; Post-curing 13.
5 kg / mm ² Flexural modulus: post cure before 1140kg / mm ^2; postcured after 116
0 kg / mm ²

[0030]

INDUSTRIAL APPLICABILITY The aromatic polyamide oligomer having a polymerizable unsaturated group at both terminals or side chains, maleimide compound, N, N, N ', N'-tetraglycidyl m of the present invention
-Xylenediamine and / or 1,3-bis (N, N
The thermosetting resin composition containing diglycidylaminomethyl) cyclohexane and glass fiber has excellent heat resistance, mechanical strength and processability, and
It is expected to find a wide range of uses such as various structural members and sliding parts, and has a great industrial use effect.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI Technical display location C08K 7/14 KLC C08L 63/00 NJZ 77/00 KKZ

Claims (1)

[Claims] 1. An aromatic polyamide oligomer having a polymerizable unsaturated group at both terminals or side chains, (b) maleimide compound, (c) N, N, N ', N'-tetraglycidyl m-. A thermosetting resin composition containing xylenediamine and / or 1,3-bis (N, N-diglycidylaminomethyl) cyclohexane and (d) glass fiber.