JPS61151242A - Flame-retardant phenolic resin laminate - Google Patents

Abstract

PURPOSE:To provide a laminate having improved flame retardance while retaining good punchability, by laminating a prepreg, which is impregnated with a melamine-modified phenolic resin soln. contg. a flame retarder and a flame-retardant reactive diluent and dried onto a substrate and molding the laminated by heating. CONSTITUTION:In the production of a laminated sheet comprising laminating predetermined sheets of prepregs, which are impregnated with a thermosetting resin soln. and dried, onto a substrate and pressure-molding the laminate by heating, a melamine-modified phenolic resin soln. contg. a flame-retardant reactive diluent composed of a 2,6-dibromo-4-alkylphenyl glycidyl ether of the formula (wherein R is a 3-18C alkyl) is used. By using the compd. of the formula, the quantity of the flame retarder to be added can be greatly reduced and hence flame retardance can be improved while retaining good punchability.

Description

[Detailed description of the invention]

[Industrial Application Field] The present invention relates to a phenolic resin laminate used for electronic, electrical parts, etc., and its purpose is to completely improve flame retardancy with 11 while maintaining punching workability. . [Conventional technology] Conventionally, phenolic resin laminates used for electronic and electrical parts, etc. are processed into laminates when punched using a full press etc. in order to attach a large number of electrical parts such as ICs, Runsisters, and LSIs. , cracks, etc. often occurred. Furthermore, in order to meet the demand for flame retardancy, a large amount of flame retardant is sometimes mixed into the thermosetting resin, which causes cracks to occur more frequently. [Problems to be Solved by the Invention and Means for Solving the Problems] The present invention solves the above-mentioned drawbacks.

[-Tap 1] In a laminate made by laminating the required number of pregs and molding them under heat and pressure, a thermosetting resin liquid is added to the general formula (■) (wherein R is an alkyl group having 3 to 18 carbon atoms. )2,6-dipromo4-alkylphenyldi11
This invention relates to a flame-retardant phenolic resin laminate using a melamine-modified phenolic resin liquid containing cidyl ether. Since the compound represented by the above general formula (1) acts as a flame retardant reactive diluent, the amount of additive flame retardant added can be greatly reduced in the laminate of the present invention, thus maintaining the punching properties. It was possible to completely improve the flame retardancy with the original product. [Function] The present invention will be explained in detail below. A base material made of a combination of these materials used in the present invention. 2,6-dipromo 4-alkylphenyl di-11 cidyl ether, which is a flame-retardant reactive diluent represented by the general formula (+1),
-dibromo-4-isobrobylphenyl]1 cidyl ether, 2,6-dibromo-4-tert-fuy-ruphenyl 11 cidyl ether, 2,6-dibromo-4
-nonylphenyl 11 cidyl ether, 2,6-dipromo 4-dodecylphenyl 11 cidyl ether, and the like. These can be used singly or in combination. Examples of flame retardants include tetrabromodiphenyl ether, decadiphenyl, tetrabisphenol A1 cresyl diphenyl phosphate, ToII bromochlor"loprovir phosphate, ToIIs diclodipropyl phosphate, and tetrabromobisphenol A1 cidyl ether. Melamine-modified phenolic resin is also not particularly limited, but it is preferable to combine phenol such as phenol or cresol with formaldehyde or paraformaldehyde in the presence of methylolmelamine. A melamine-modified phenol resin obtained by reacting a formaldehyde such as phenol resin with formaldehyde in the presence of a catalyst is preferable because the resin liquid and preg have good storage stability, and the catalyst is not particularly limited, but is preferable. Examples include tertiary amine catalysts such as ammonia, trimethylamine, and trinoethylamine.For example, when using 28% ammonia water as a catalyst, less than 3 parts of phenol will slow down the curing speed, and 6 parts If the temperature exceeds that level, the resin will polymerize and the impregnating properties of the laminate substrate will decrease.
This is not preferable because it tends to cause a decrease in physical properties. It is also possible to adjust the concentration of the resin varnish or to use an organic solvent for dissolving the flame retardant. Examples of the organic solvent in this case include methanol, acetone, and toluene. [Examples] Hereinafter, the present invention will be explained in detail with reference to Examples, but the present invention is not limited by the Examples. Examples 1 to 3 Thermometer, stirrer, condenser and dropping funnel)? Add phenol 184F, 37% formaldehyde 130 fk methylolated tumelamine 259 to the attached flask.
~80°C and 15f' of 25thiammonia water as a catalyst.
The mixture was added dropwise over 15 minutes, and then reacted for 90 minutes to obtain melamine-modified phenol resin A (non-volatile content: 60%). Add flame retardant type reactive diluent, flame retardant, etc. to this as shown in Table 1 to obtain varnish adjustment liquid for laminates Bk thickness 0.28+
M kraft paper is impregnated and dried to obtain Preg 11. 1] Layer 8 pregs and molding pressure 100Kf/d
A flame-retardant paper phenol laminate was obtained by thermoforming at a temperature of 160° C. within 90 minutes. Conventional Example 1 A flame-retardant paper phenol laminate was obtained in the same manner as in Example except that resin C obtained by adding 45 parts of tetrabromidiphenyl ether as a flame retardant to A was used. [Effects of the Invention] The varnish compositions of Examples and Conventional Examples are shown in Table 1, and the results of laminate performance tests obtained using these are shown in Table 2. 6-1) JIS-6911 2) No □ Punching test with punching mold ×: Ri, rack occurrence ○: Good ◎: Excellent

Claims (2)

[Claims] (1) In a laminate made by laminating the required number of prepregs impregnated with a thermosetting resin liquid into a laminate base material and then heated and press-molded, the general formula (I) ▲mathematical formula, chemical formula, table, etc. ▼ (I) Characterized by using a melamine-modified phenol resin liquid containing 2,6-dibromo-4-alkylphenylglycidyl ether represented by the formula (R is an alkyl group having 3 to 18 carbon atoms). Flame-retardant phenolic resin laminate. (2) The flame-retardant phenolic resin laminate according to claim 1, wherein the melamine-modified phenolic resin is obtained by reacting phenols and aldehydes with a catalyst in the presence of methylolmelamine. .