JPS5922963A - Manufacture of molding compound for sealing - Google Patents

Abstract

PURPOSE:To obtain titled molding compound with high crack-resistant potential, suitable for sealing electronic parts, by kneading in advance, a thermosetting resin with specific two sorts of polybutadiene rubber and an inorganic filler followed by incorporating the resultant blend with a curing agent and then carrying out a further kneading. CONSTITUTION:The objective molding compound can be obtained, first by kneading (A) 100pts.wt. of a thermosetting resin with (B) 10-30pts.wt. of a polybutadiene rubber with no functional group, in one molecule, other than double bond, (C) 5-10pts.wt. of a second polybutadiene rubber with both terminal hydroxyl and internal epoxy groups, and (D) 200-600pts.wt. of an inorganic filler, followed by incorporating a curing agent in the resulting blend to carry out a further kneading. The former polybutadiene rubber is pref. of a molecular weight 150,000-250,000, with 1,4-cis bond accounting for >=95wt%. The latter polybutadiene rubber is pref. of a molecular weight 2,000-4,000.

Description

[Detailed Description of the Invention] Today's electronic devices are being pursued to be smaller, lighter, and thinner, one by one. It depends on whether it is possible to make the molded product υ plastic S thinner and smaller. The tendency for cracks to occur under various temperature environments is also an important cause of reduced reliability.

Therefore, Shun Ima thinks that countermeasures against cracks will become a major issue. As a workaround for this.

Various methods have been provided for Cn1, but the basic V
C is ■ Parts to be sealed CtJ thermal expansion
However, the method (2) has its limits because the optical filler is added to the θ1 ratio, which reduces the mobility of the molding material. ■ Since the secondary transition knitting degree of general Vt disposable resins is in the low u times, it may be difficult to employ it in relation to the security of sealed products. On the other hand, ■ is il
From the viewpoint that there is little to say,
:I have become increasingly frugal as the best policy.

Although it is called the VC rubber addition method, the rubber Vt is r(
A two-layer stand or a device that completely disassembles the polar group is required, but simply adding m alone will reduce the molding Vt, increase the age of the rubber, and cause mold contamination due to VC, and molding. Problems arise with the appearance of the product, such as burrs or burrs.

The present invention overcomes all of these problems and provides a composition and manufacturing method for obtaining a molding material with low crack resistance.
It is a frugal and frugal kasu pot.

The present invention is directed to a P-curable resin.

Polybutadiene rubber having no functional groups other than VC2M #J@ in the molecule 1o to 5oniipm terminal V (water group,
Polybutadiene rubber with internal Vt epoxy groups 5
~10.1 Blood bt1 and Kumaiso original side agent 2゜O~600 JJy that says Stop Seito, mix everything in advance, and knead this (L) kneaded product VC6Ji agent 6 t Features The present invention relates to a method for producing a molding material for sealing.

The thermosetting resin used in the present invention is epoxy 4
Every month on November 11th, polyester is used as a molding material.

It is possible to use the same polybutadiene rubber in combination with the sword I.
The reason for the warping is that the heather invention is characterized by the above-mentioned problem, the rubber starting to bulge out, and the appearance of the molded product due to mold stains. Paris (Ibari)
This is because the effect of ``So-VC'' functions in the extreme.

In particular, polybutadiene rubber that does not contain any functional groups other than V(2)1 pod in the molecule has hydroxyl groups on the end of the wood, which causes mold stains due to the VC that oozes out, and the appearance of the molded product. The polybutadiene rubber used for this purpose is manufactured in Paris.VC
○Also, the limit of blood pressure VJ1 is approximately 1 υ saving, the tx heat llll 7 is 21.6 V (the effective range, the polybutadiene rubber a is listed separately) 'JILIIJ A, a Zhu's minimum ship and maximum ship 11 fences are 7J < ding.

Polybutadiene rubber that does not have any functional properties other than two plates in the molecule should preferably have a molecular weight of 150,000 to 250,000, and a 1.4 cis type lees with 95 parts or more, preferably 7L,
I'm 2'L from iJ.

Terminal r hydroxyl group, epoxy inside? The polybutadiene rubber having a molecular weight of 2,000 to 4,000 is preferably used, and these are also commercially available.

[This] Shira no Gomuke He wholesale 1 and average t49. In this method, a thermosetting resin consisting of the main components and a filler are forcibly mixed in a three-part system of rubber, so that they are mutually dispersed by the shearing force of VCX.

The stiff rubber dispersion is prepared using a mixing roll, kneader, 5 forces, 1
Of course, it can be kneaded using a pressure kneader.

As a filler, silica, silica glass, talc, diatomaceous earth, glass fiber, etc. are conveniently used, but the selection of -/C and the optics are determined by the molding method and the parts (devices) to be sealed. L
To prepare for the final molding process, add a curing agent, a curing agent, a mold release agent, etc. to the rubber dispersion as necessary.

VL such as stiff composition Chemikinon Groll, extrusion type mixed wire iso, etc.
It is crushed using the cold shoulder j solidification shun, Homai style crushing 4 years old lud sound.

This article explains the manufacturing method of the secret molding system for anti-resistance molding. It has excellent crack resistance.

The present invention will be explained below with reference to Examples.

Example Polybutadiene rubber (manufactured by Nippon Zeon Co., Ltd. Product name 2-ball BR-1220, molecular weight 200,000, 1°4 cis type introduction 98
% or more) 10PivS, terminal hydroxyl group.

Liquid polybutadiene rubber having a flyc epoxy group (manufactured by Idemitsu Petrochemical Co., Ltd., trade name Polygetashev R-45)
Epl, molecular weight 2800) 5 to Eboki 7 resin (manufactured by Nippon Kasosha, trade name EOCN102) 100 parts As a filler,
Quartz Guns powder (manufactured by Hiramorisha, trade name: Fuse Rex RD)
-8) Pour 400 parts into a single-pressure Ni-Goo heated at 90 to 95°C, stir for 60 minutes, take out, cool and assimilate, and then crush. Rubber dispersion 515 times, 2-enol novolak side fat as hardening agent (softening point 90'C)
40 parts, curing aid (Shikokuka H, Co., Ltd.'JI, trade name: Imidazole CItZ) 5 parts, 5 parts of stearic acid as a IIItE type agent, and 1 part of pigment carbon fluff were added, and the mixture was subjected to IWJ drying for 60 seconds using a Henschel mixer. Afterwards, mixing roll (roll 60~65℃, rear roll 80~
The mixture was melt-kneaded for 10 minutes at 85°C and 1 gear (5 to 5 num) VC.

After cooling and solidifying, the molded material obtained by crushing was a problem (rubber CI) - extrusion, mold contamination 7L, the appearance of the bottom molded product was cloudy, and even if there were particles, it was 1.5111 [11 Below (ml
l: in casell11!6m1oX 20μ deep slit vt (i (Measure the δ of the oozed material. Mold temperature 1
80'c, molding pressure cuff 0kg/atM, molding time 90 seconds)
The fL style was the best. 1 Thermal shock test (150
Soak in corn oil at °C for 2 minutes, soak in the liquid for 2 minutes (1 cycle), and soak the mold for 2 minutes.
1 JD, shape pressure cuff 0 kg/an', IMJ 90 seconds for R type, sample (7X7XQ, 5 mm silicone
4X20X2mm molding
°G, 6 o'clock + M + after-cure and 0 The magazine says that it is a clutter-resistant molding material that does not generate clutter even after 500 cycles.
did.

Example 2 Polybutadiene rubber (Nippon Zeon ft., trade name, 2-ball BR1220), 20% polybutadiene rubber (
Product name Polybutadiene R45Epl manufactured by Idemitsu Petrochemical Co., Ltd.
) t3 Miyako Evokin 41N Kotsu (manufactured by Nippon Kagakusha, product name EO)
CN l 02 ) 100 m Quartz glass powder as a light emitting agent (decomposition preparation).

Product name: Fuse Rex RD-8) 400 Miyako 90-9
A pressurized kneader VC with a sharpened blade was placed at 5'C, the mixture was mixed for 50 minutes, and the mixture was taken out and pulverized.

528 parts of the rubber dispersion of the straddle period 40 parts of phenol novo 2 resin (softening point 90'C) as a VC curing agent, curing aid (Shikoku Kasei Co., Ltd., trade name: Imitanol Cry z) s
6 parts of stearic acid, a pigment, and 1 part of carbon black were added as a mold release agent, and the molding material was prepared under the same manufacturing conditions as in Example 17'111.

The molding material of this C1JJD exhibited all the same molding characteristics as in Example 1 (the appearance of the molded product, cracks, etc.), and the casing also showed no cranking even after 600 cycles in the thermal shock test.

Comparison? l11 Acrylonitrile butadiene comb (manufactured by Nippon Zeon Co., Ltd.)
15 parts of epoxy resin (Nihonka Kuwasha Exhibition, product name EOCN102), 100 f quartz glass powder as a small light guiding agent (manufactured by Ryumori Co., Ltd., product name Fuse Rex RD-8) 400 parts 95℃VC71I]YM
Pressurized kneader - No crosstalk for 30 minutes after charging VC.
Take out, cool, solidify and pulverize - J-RU○ Rubber dispersion 515fillVc phenol noborasota resin 40 as curing agent, curing aid (manufactured by Shikoku Kasei Co., Ltd.,
Product name: Imidazole Cl7Z) 5 parts, mold release: 6 parts, stearic acid: 5 parts, pigment, carbon black: 1 strength, 1 second: (yt-like C1, J manufacturing conditions).

Molding material of Example 1 and the appearance of the molded product with mold contamination and mold contamination (mold, molded with mold contamination of 5 mm or more). However, in the thermal shock test, cracks were observed even at rJ 500 cycles. There was no outbreak.

Comparison? l12 Epoxy resin (manufactured by Nippon Kakei Co., Ltd. Product name: EOCN102)
Phenol Novo (manufactured by Ryuso Co., Ltd.) using +0011 as a curing agent.
Product Name: Fuse Lesotas KD-(3) 400 Mt. # Release Δ Listearin 61β Face ■ Carbon Black 18 to 77 Lumi Senjo-V (Mix for 60 seconds, conduct?
This CIJ molding department has molding properties equivalent to or better than i.
On the other hand, the hot WJ military trial relative V (O-I is 50-7
A crank occurred in the 0 cycle. After 0 or more, @7ζ
As shown, in the VC of the present invention, the entire rubber uniformity V (
Dispersion of V (Lυ) leads to VC that provides a molding material with excellent crack resistance.

17t I By using C in conjunction with the polybutadiene comb that has a polar group, we were able to solve the problems of the conventional method by making the so-called molded -+-i+ raw material, such as Paris, the same as above. .

Claims (1)

[Claims] 1. A total of 1Q to 60 parts of polygtadiene rubber, which has no functional groups other than double bonds in one molecule for the thermosetting resin + oomitsi'c, and has hydroxyl groups and VC epoxy groups at the ends. A composition that says 5 to 10 pyributadene rubber and 200 to 600 pyributadine rubber? Sealing molding material QJ manufacturing method that involves adding and kneading a curing agent to Bm mixed in advance