JPS5865643A - Silicone rubber molded body and manufacture thereof - Google Patents

Abstract

PURPOSE:To produce efficiently a molded item, by bringing a diorganopolysiloxane composition that will not crosslink into surface contact with an organopolysiloxane composition that contains a curing catalyst which can initiate the crosslinking reaction of the former composition. CONSTITUTION:A fluid organopolysiloxane that contains an electrical conductivity giving agent but does not contain a curing catalyst is cast to a part of a cavity of a mold where a contact it to be formed, and then an insulating organopolysiloxane composition that contains a curing catalyst is cast thereonto. Then the mold is heated to cure the compositions to obtain a pushing button switch cover molded body having an electrically conductive contact.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a silicone molded product useful as an electronic device component and a method for producing the same.

The silicone rubber molded article is generally made of diorganocarbon 9VO chitin, an organopolymer composition C, and a necessary amount of a curing catalyst, such as an organic peroxide, a gold-organic acid salt or ester, an amine compound, $ After uniformly dispersing and mixing the quaternary asonium salt, platinum or platinum compound, etc., they are heated, heated at T1, pressure heated at T1=, or subjected to a crosslinking reaction at room temperature, and molded and hardened. made by the method. However, the organopolymer containing the curing catalyst
When looking at the vulcanization of Va chitin composition using a 1itt-disc rheometer, this shows that the torque increases with the passage of time (13. In fact, compression molding, injection molding, etc. The organoboric composition E7+f in the composition flows during the transient state of the crosslinking reaction, and it flows into the gold and the cavity to obtain a molded product. = causes distortion and variation in thickness due to pressure and compression in the above-mentioned transient state, d<, 1,7 Therefore, molding of ultra-thin objects and precision parts by this method has the disadvantage that the yield is poor.

In order to reduce the disadvantages caused by this molding method, 1:
A method is also known in which an organopolysilochitin composition containing a curing catalyst exhibiting flowability at room temperature is injected at around room temperature and molded. In addition to shortcomings such as short pot life and easy gelation in dead spaces, in this case, C: is used by degassing air S mixed in 1: in the composition in advance when blending the curing catalyst. This also has the disadvantage that the containers for its formulation, distribution, etc. must be thoroughly washed to ensure that no cured product remains.

Nao, electronic equipment AM products for each tower 1 For example, the molding process of silicone rubber molded products as contact members such as interconnectors is an integrally molded product made by fWIIHI with a pre-molded conductive rubber member and an insulating member. However, this method has two drawbacks: it is difficult to remove air bubbles that occur at the interface between the two parts, and the two parts tend to separate at the interface. The V silicone rubber component on the 5th knee side is 1:33 Ko.
A complete method was proposed in which an organic peroxide with an activation energy above al/mol a was blended, and this was filled with other primary molded products in a C dikin dyeing medium and heated under W pressure. In this case, distortion occurs between the primary molded product and the secondary molded product due to heat history and pressure applied during compression molding. In addition to partial deformation of the molded product, if the next molded product is made of conductive rubber, contamination may occur on its surface, resulting in poor conductivity, or damage to the middle of the next molded product. There was a disadvantage that secondary molded product C2 conduction defects and short circuits occurred due to movement of the secondary molded product C2.The present invention aims to solve these disadvantages by combating the following problems: This is achieved by interfacial contact between a diorganobossilochitin composition that does not undergo a crosslinking reaction by itself and a curing catalyst that causes a crosslinking reaction in this composition, or an organopolysilochitin composition containing this curing catalyst. It is characterized by being formed as an integrally molded product.

To explain this tube, each inspection machine made of 12 V 9 cone rubber of the present invention! ! As a result of various studies on methods of manufacturing the parts, we found that we could use a molded body made from diorganopotulyloxane, which does not contain a curing catalyst and therefore does not undergo crosslinking reactions by itself, and a molded body of a diorganopolyxane composition that contains a curing catalyst. Is it an excipient that has not yet been fully sensitized, or even still retains saponification catalytic function? ? When they were heated by touching them, they found that the silicone rubber excipients that did not contain a curing catalyst tube were gradually cured from the touch interface by the curing catalyst contained therein. These are two of them (:゛As a result of the experiment, excipient C of a diorganobossilochitin composition that does not contain a curing catalyst: A curing catalyst is brought into interfacial contact, or an organopolysilochitin composition containing this curing catalyst Alternatively, if the excipient is brought into interfacial contact, this diorganoborisilaxane composition @-2 crosslinking reaction that does not contain curing catalyst 1 proceeds, and this is a heat-curing type.

The present invention was completed after recognizing that the same observation can be made in any case of warm hardening gold.

Invention i: The organopolysium group acid used may be any conventionally known one, for example, one with the general formula Rn810
4-n (R in c- is non-koji-converted violet or koji-converted monovalent hydrocarbon crystal, nrx is a positive number of 1.9 to 2.1). , this R is mainly a 7-methyl group, and phenyl groups, vinyl groups, allyl groups, ao-p-a-vinyl groups, V-anopropyl groups, etc. are added to this as necessary, but this is not true. The fine end of the molecule may be capped with a functional group such as a hydroxyl group, a vinyl group, or an allyl group.The viscosity of this organoborami-10 chitin is not necessarily specified.

This generally has a viscosity of 10 to 2,000 at 28℃.
G, 0000p, which is usually too, oooop or more f)l2V
It is used as a composition with the addition of fillers such as iron oxide, heat resistance improvers such as iron oxide, various carbonates, flame retardants such as platinum, various powders, carbon black, etc. The cross-linking reaction of the organoboyaki leaf composition with the electric conductivity proceeds in the presence of a curing catalyst, and therefore it is a cured product, and these two are heat-curable. Although there is a room-temperature curing type, the glue refone rubber molded product of the present invention can be made using any of these methods.As for this curing catalyst, various organic peroxides can be used for the heat-curing type and pressurized heat-curing type. material or platinum t1
e is a platinum compound that cures at room temperature, and t is a type of crosslinking reaction.
Examples include organic compounds or esters, amine compounds, 184-grade ammonium salts, platinum compounds, and any of them can be used in the present invention.

ll in the production of the i/1 Kosi rubber molded article of the present invention!
The components are diorganopo9VAKinashiM compositions that do not undergo crosslinking reaction by themselves, and include diorganopo9VO group ψy group acids of heat-cured potatoes that do not contain curing catalysts such as organic peroxides, and vinyl group In the presence of a platinum thread catalyst, an addition reaction is carried out between the containing organoborisiloxane and the organohede ajesipolysiloxane containing -81H crystals in the presence of a platinum thread catalyst. Examples include those containing diplatinum thread catalysts, but these are also known as so-called two-component room-temperature curable (R'l'V) compositions, in which only the main ingredient of this two-component type is used. *'lcFor this two-component type, which mixes equal amounts of A and B, the A or B
Examples include liquids alone. These diorganopolysia acids are used as viscous bodies that flow viscously at room temperature, do not flow at room temperature, or as viscoelastic bodies that exhibit a plasticity of 5 oo or less on a William plasticity meter. However, it is preferable that this material is shaped in advance into a desired shape containing a curing catalyst that causes a crosslinking reaction or this curing catalyst. It can be done by using a suitable knee cloth, spraying or pouring, or by means such as Tubisig 1-minute sheeting jig.
If the thickness of this excipient is too large, the cross-linking reaction within the excipient after the field dissemination with the curing catalyst 11 or the curing catalyst-containing organizer screw composition will become uneven, and the curing will not necessarily be completed completely. Therefore, the thickness is less than 5 mm, preferably 5 mm.

pwa or less, and preferably 6:1L<t1200pm or less. However, this shaping is not necessarily necessary, and the fluid of the St component is cast into the shape of the s2 component described later, and both are may be brought into contact with the interface.

Component 1 for obtaining the molded Shidafushi rubber product of the present invention is a resiloxane composition which causes a two-crosslinking reaction with component III described at @, and this is a composition in which the first component is a heat-curable dimethyl carbon 9va compound. Organic peroxide if available, or WB
If it is of the L-responsive type, it is said to be an organohydrogen which is to be reacted with a vinyl group-containing compound as a component II, to which is added platinum and a proprietary compound. However, if it is a two-component RTV composition, this component can be used as a main ingredient, such as a curing catalyst, or as a component! The B liquid used as a component may be 1wt or 1wt mixed with the 1st liquid, and the B liquid t may be mixed with the 1wt or 1st liquid, and 4: This 1: Various curing catalyst tubes. When this component consists only of the curing catalyst of the diorganovo VVa quinane composition as the component described in 1, in the case of the NC of the present invention, this curing catalyst can be diluted with an organic solvent. and this is i
It may be applied by spraying, coating or spraying onto the excipient made from the st component, but if this component is an organoboric acid composition containing a curing catalyst, the acid di may be preformed. Then attack! All you have to do is bring it into contact with the component.

However, this excipient is not necessarily necessary, and the vK of this second component! Interfacial contact with components: contact with fill components containing excipients may be carried out by injection or by wiping the excipients. 2, this 1B! ! The shaping of the component can be carried out in the same manner as the shaping of the lIl component by wiping or wiping it on a suitable carrier, or by pouring it into the carrier. Rolling and shrinking! This may be done by molding or injection molding, but in this case, the organacuate qvaxane composition constituting the lI2 component is not completely cured and the curing catalyst contained therein still retains its curing catalyst function. You need to keep it in the same state.

This interfacial contact between component 82 and component 82 is achieved by blind folding and lamination of the two excipients, but according to this 52, the action of the curing catalyst in the second component is effective! i! l
ml component, but this excipient is suitable for the first component, II.
Either of the two components - 1 may be this shaped body 1: unshaped component + m cloth, Note 1, or neither of the two components may be used as a shaped body, and the heat treatment is spread in a fluid state, and after curing. 1: It may be shaped.

As mentioned before the present invention, it can be applied to both the heat-curing type and the 1III-curing type, but when using a heat-curing type organacupoint Va composition, the ml component and the lI2 component are superimposed. When heated or heated under pressure after being combined or laminated, the hardening catalyst-free Diorganovo 9VC1 Kinashi composition is cured.
Since this process is carried out sufficiently twice, it is advantageous that a silicone rubber molded product with no residual strain as designed by the mold can be easily obtained. When using the composition S2, it is necessary to mix these two liquids in advance (therefore, the degassing step after mixing can be omitted, and the pot life will be reduced. This also provides the advantage of eliminating the need for washing the washing machine.

The present invention can be widely used in the production of various electronic parts, for example, in the contact area of the mold cavity, using a fluidized organometallic acid quinane containing a heavy charge imparting agent but not a curing catalyst. After molding, an insulating organoboric a-quinane composition containing a curing catalyst is directly injected onto the mold, and these are heated and cured. It is possible to acquire data without shifting the position of the contact member. 11. In this case.

Ship@S in the mold cavity: By casting the Shibufushi rubber composition containing the Aiko powder tS as a coloring agent, it is possible to obtain a colored key tube switch cover molded body 1 with metallic luster. An insulating orgapot containing a curing catalyst! 1 or parallel pores 1 or 2 penetrating from above and below in lva combination acid compound! Prepare an excipient with i[t, inject diorganoborisiac acid tubes containing porcelain tubes with double electrification but not containing hardening catalysts II&, and heat them. When cured, alternating conductive metals and solid metals are formed, which facilitates the production of molded elastic connectors.

In conclusion, the molded product according to Invention X does not contain a curing catalyst, and therefore has no pot life or gelation at all. This is cured by contact C2 with a curing catalyst, and the contact with the curing catalyst can also be carried out by contacting with the organoborisiloxane composition containing the catalyst tube or a molded article thereof. In case g2, both 1i can be made into a complete two-piece molded product, so according to this case, it is possible to create a silicone rubber molded pipe that solves various disadvantages of conventional products.It is easy and efficient. .

Next 1: Examples of the present invention will be given.

Example L Kashima hardened gold transparent rubber for general molding KE6s〇-
3,100 parts of υC manufactured by Shin-Etsu Chemical Co., Ltd., and 3.5111 parts of the curing catalyst C-2 (manufactured by Shin-Etsu Chemical Co., Ltd., trade name).
was added to the mixture, thoroughly kneaded in a mixing bowl, and then separated into a film with a thickness of 100 mm using a calendar meal.

Next 1: Same heat-cured dyed skewer 11 black v for general production 1
tt Foon rubber [1131701-U (manufactured by Shin-Etsu Chemical Co., Ltd., trade name)] Thoroughly kneaded with a tube t kissing roll, divided into a film with a thickness of 100 mm using a calendar meal, and layered this and the above film alternately. Laminate them to make a 20G-thick laminate tube, which is about 110m at trso℃.
After compressing to 12, the thickness is 50m under the conditions of mail temperature lsO ℃ 1 ambient temperature 160C! After hot-press molding at home, a completely integrally molded silicone rubber plate was obtained.

Then, when this plate-like body was cut in the stacking direction J:l [corner-==, there was an absolute kettle and a palm cutlet! A striped connector was obtained in which layers were stacked at a pitch of 10p11, in which the embroidered part and the 411st part were completely integrated, and the insulation between the conductive parts was also perfect.

Example 1 Heat-curable silicone rubber for extrusion molding K1151-U
(manufactured by Shin-Etsu Chemical Co., Ltd., product name) 1: 0 as the catalyst
-2 (II output) α8m and 0-s (manufactured by Shin-Etsu Chemical Co., Ltd., trade name) 41B? The mixture was added and thoroughly kneaded in a mixer bowl, separated into a film with a thickness of 50 μm using a calendar roll, and then heated with a hot roll at 130° C. to form a film with a thickness of 7 G pm.

Next, ##11 sacrificial liquid was injected onto this film in liquid form.
Silicone rubber 1B1941 (manufactured by Shin-Etsu Chemical Co., Ltd.)
A liquid tube (part name) was doped to a thickness of 50 μm, and these were layered in 81 layers of 220 μm l, and compression molded at 160° C. to obtain a molded product with a thickness of 200 pm.

In addition, this block-shaped molding txt! - The ieIm layer was 70.
An alternating laminate with am and aJ electrodes 11 of 30 μm was obtained,
This laminate t and ten thousand of its laminates
! A rod-shaped body with a T surface shape does not break even when stretched 1.5 times in the direction of its lamination. K
Two drops of R1941 (mentioned above) were applied to the contact area 6 of the heated push button switch mold cavity to a thickness of 0.
2-Heavy electrical dissemination point i: Shape, then heat-curable insulating V9 cone rubber KE951-U (ffl
Manufactured by Etsu Kagaku Kogyo Co., Ltd. (Product name) 100! The curing catalyst 0-3 (out of 10) 3! The organopolysilochitin composition was added to the top part of the push button and kneaded well in an i-xing mill, and then molded to a thickness of 5 cm as a push button top part. Good as a push button switch 1: Operated.

Example 4 Two-component room-temperature curing for botting molding @IV Tsukone Rubber KK102RTV (manufactured by Shin-Etsu Chemical Co., Ltd. - trade name) Curing catalyst tube-free liquid t1 On a polyethylene terephthalate film whose surface was coated with a mold release agent I2 50 μm thickness i
and then apply the curing catalyst on the surface.
-RH (manufactured by Shin-Etsu Chemical Co., Ltd., trade name) was sprayed and left to stand for 8Wj at 25°C, resulting in an ilu-cone rubber film with a thickness of 50μm, which is due to the presence of air bubbles. was not recognized・夷ml551゜Botting City Two-Part Lowll1th#I! 2g of Kakin silicone rubber KKi06LTV (Shin-Etsu Chemical Co., Ltd. 11φ product name) liquid that does not contain a curing catalyst! -X25@lX
3- Phenolic resin container section 2 depth 2m! Inject with
Next, Al0-RG (manufactured by Shin-Etsu Chemical Co., Ltd., trade name) was injected into the liquid level using the curing catalyst until the liquid level rose further 621 degrees, and the container was placed in an oven at 100°C. The two of us noticed that the surface of the container had a rubber-like appearance, and that the surface of the container had not yet sufficiently hardened. When I put it in the oven at 150C for 230 minutes and took it out, I found that the bottom part was a viscous fluid and the middle layer was gel-like, but the top surface was a completely cured rubbery substance. .

Example 6゜

Claims (1)

[Scope of Claims] l) A diorganopolysiloxane composition that does not undergo a crosslinking reaction by itself, and a curing catalyst that causes the crosslinking reaction, or an organopolysilyl resin containing the curing axis at. Interfacial contact with the chitin composition (=therefore, a silicone rubber molded article in which both are integrally molded. 2) This composition-di-crosslinking reaction is applied to the excipient of the diorganopolysilochitin composition that does not crosslink by itself. 1. A method for producing a silicone rubber molded article, which comprises bringing into interfacial contact a curing catalyst that causes curing catalyst or an organosilokinashi composition containing this curing catalyst, and a molded object thereof to form an integral product. 3) Casting a diorganopolysilochitin composition containing a curing catalyst, which does not react on its own, and integrally molding the inner part. 1. A method for producing a silicone rubber molded article.