JPH01297486A - Non-drying putty - Google Patents

Abstract

PURPOSE:To obtain the title putty having excellent sealability, workability and not mutually bonding during preservation by subjecting the surface of an uncured silicon composition containing an organopolysiloxane and a filler in a specific ratio to non-tacky treatment. CONSTITUTION:The surface of an uncured silicon composition containing (A) 100 pts.wt. of organopolysiloxane [e.g., formulas I-V (n is degree of polymerization)] having usually 1,000-1,000,000,000CP (preferably 100,000-100,000,000CP) viscosity and (B) 20-500 pts.wt. of filler comprising especially preferably calcium carbonate is subjected to non-tacky treatment to give the aimed putty. The non-tacky treatment is carried out preferably by coating of a block copolymer shown by the formula PHISiO1.5.PHIMeSiO.Me2SiO.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a non-drying putty.

[Conventional technology]

When connecting a member to another member, a gasket, putty, or the like is used at the joint to maintain airtightness of the joint. For example, recently, high-efficiency particulate filters are installed on the ceiling, side walls, etc. of clean rooms used in various fields to filter external air and supply clean air. Sketches or putty are used to maintain the airtightness of this mounting area and prevent unpurified air from entering.

[Problem to be solved by the invention]

However, the conventional gasket or putty described above may not exhibit sufficient sealing effect or may have poor workability during installation, replacement, etc. For example, when used in a clean room filter mounting part, unpurified air may leak into the clean room due to poor sealing properties, reducing the cleanliness of the clean room, and when replacing the filter, the gasket However, there were disadvantages in that the putty and putty remained on the flange of the filter, causing contamination, and that replacing it required a great deal of labor.

In order to improve these drawbacks, it has been proposed to use strips of silicone rubber as a sealant (Japanese Patent Application Laid-open No. 61-427). There was a problem in that cleanliness could not be avoided due to contamination from the attached release sheet.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a non-drying putty that exhibits good sealing properties, has excellent workability, and does not cause contamination even when used in the attachment part of a clean room filter.

[Means to solve the problem]

The present invention solves the above problems by comprising an uncured silicone composition containing (A) 100 parts by weight of an organopolysiloxane and (B) 20 to 500 parts by weight of a filler, and the surface of which is treated with non-adhesive treatment. The present invention provides a non-drying putty made by applying.

The silicone composition (
The alkaline polysiloxane which is the component 8) has, for example, the following formula: % formula %] [Here, R is a hydrogen atom, a halogen atom, a hydroxyl group, a substituted or unsubstituted monovalent hydrocarbon group, such as a methyl group, Alkyl groups such as ethyl group and propyl group, unsaturated aliphatic groups such as vinyl group, acryloyl group, butadienyl group, aromatic hydrocarbon groups such as phenyl group, xenyl group, naphthyl group, or carbon atoms of these groups. Examples include those in which part or all of the bonded hydrogen atoms are substituted with fluorine, chlorine, etc., where a is 1.98 to 2.05.

Specific examples of the organopolysiloxane which is component (8) of the silicone composition of the present invention include those represented by the following formula.

[In the formula, n represents the degree of polymerization].

The viscosity of the organopolysiloxane which is component (A) of the present invention is usually 1,000 to 1,000,000,000.
cP, preferably 100,000 to 100,000,0
It is 00.

The silicone composition (
B) Component fillers include, for example, calcium carbonate, silica, alumina, magnesium oxide, celite, titanium oxide, iron oxide, cerium oxide, iron octylate, zirconium oxide, diatomaceous earth, talc, boron nitride, and silicon carbide. , silicon nitride, zinc oxide, etc., and preferred are calcium carbonate, silica, alumina, magnesium oxide, celite, titanium oxide, and iron oxide, and particularly preferred is calcium carbonate because it shows little change over time. These can be used alone or in combination of two or more.

The amount of component (B) to be used is determined based on the amount of component (A) used in the silicone composition.
20 to 500 parts by weight, preferably 30 to 150 parts by weight, per 100 parts by weight of the organopolysiloxane component (). If the amount of component (B) is less than 20 parts by weight based on 100 parts by weight of the organopolysiloxane (component (8)), it will be difficult to maintain a constant shape when molded.
The shape also changes significantly over time. If the amount exceeds 500 parts by weight, the viscosity of the silicone composition becomes high, making it difficult to mold and lacking in flexibility, resulting in insufficient sealing properties, for example.

In addition to the above-mentioned (A) and (B) components, the silicone composition that is the material for the non-drying putty of the present invention may optionally contain:
Processing aids such as low molecular weight siloxane esters and silanols, such as diphenylsilane diol and polyalkylene oxide; flame retardants such as platinum 5 and magnesium carbonate; pigments such as carbon black, red iron oxide and ultramarine blue, etc. may be added.

The non-drying putty of the present invention is obtained by molding a silicone composition comprising the above-mentioned components in an uncured state. The shape of the molded product may be any suitable shape, such as string, band, sheet, hollow, L-shape, or L-shape, depending on the use of the non-drying putty of the present invention. For example, in order to achieve sealing performance by sandwiching the filter frame between the frame of the filter used to supply clean air to the clean room and the flange of the mounting part on the clean room side, it is necessary to It can be made into a state. When formed into a string shape, it is convenient in terms of workability, adhesion, sealability, etc. during filter installation work.

Furthermore, by embedding a reinforcing material inside the non-drying putty of the present invention, mechanical strength, ease of handling during installation, shape retention, etc. can be improved. Examples of the reinforcing material used include threads made of plastics such as nylon, polyester, acrylic, viscose, and urethane, polyester sheets, piano wire, natural threads, and glass cloth.

The method for molding the silicone composition into such a shape includes, for example, kneading the components (8) and (B) in a kneader, Banbury mixer 1 two rolls, etc., and then extrusion molding, calendar molding, coating, etc. Examples include a method of molding by.

In order to obtain a non-drying putty having a reinforcing material inside, it may be formed by extrusion molding using a thread made of plastic such as nylon as a core material.

The non-drying putty of the present invention is obtained by subjecting the surface of the uncured molded product to a non-adhesive treatment. This non-stick treatment can be applied, for example, to -liquid addition- or condensation-curing RTV silicone rubber, two-component addition- or condensation-curing RTV silicone rubber, UV- or EB-curing silicone rubber, face, radiation-curing silicone rubber,
Preferably Φ5iO1, s'ΦMeSiO-MezSi
A block copolymer represented by O, more specifically K
This can be carried out by diluting R112 (manufactured by Shin-Etsu Chemical Co., Ltd.) with a solvent as necessary and coating the surface of the molded uncured silicone composition.

This non-adhesive treatment prevents non-drying putty from adhering to each other.

The non-drying putty of the present invention can be used for the same purposes as conventional putty to exhibit sealing properties, but it can be used particularly as a sealing material for the attachment part of a filter for supplying clean air to a clean room. In some cases, it is possible to maintain stable cleanliness and not cause contamination, so it can be suitably used.

〔Example〕

Hereinafter, the present invention will be described in detail with reference to Examples and Comparative Examples. In the following, "parts" and "%" indicate "parts by weight" and "% by weight," respectively.

Example 1 Dimethylpolysiloxane KE76BS (manufactured by Shin-Etsu Chemical Co., Ltd. A Kiku) 97 parts and dimethylpolysiloxane RF5.0OO having an OH group at the end (manufactured by Shin-Etsu Chemical Co., Ltd., viscosity 5)
,000cSt) 3 parts, calcium carbonate 5SB33
3 parts of Hakuenka U (all manufactured by Shiroishi Calcium Co., Ltd.) and 3.3 parts of processing aid Uniloop C (manufactured by NOF Corporation) were kneaded in a kneader, and nylon-based (
A core material (0.3 mm in diameter) was extruded into a string shape with a diameter of 6.

Next, KR112 (Shin-Etsu Chemical ■!!!: ΦSiO+,
S+ 50% toluene solution of block copolymer consisting of ΦMeSiO, MezSiO) with T P T-10
0 (manufactured by Nippon Soda Co., Ltd., tetrapropyl titanate) through a solution obtained by dissolving this string-shaped molded product,
A non-drying putty having a non-adhesive film on the surface of the molded product was obtained.

When the specific gravity and Williams plasticity of the obtained non-drying putty were measured, they were 1.4±0.05 and 130±, respectively.
It was 30. In addition, changes in adhesive strength, plasticity and adhesive strength over time, as well as chemical resistance and sealing properties were measured according to the following methods.

Aluminum plate 50 mm long x 50 mm wide x 5 mm thick (
A-1050P) A spherical non-drying putty with a diameter of 7.5mm+ was sandwiched between the two sheets, and after crimping with a load of 1 kg for 3 minutes, one aluminum plate was fixed, and the other aluminum plate was fixed with a helical spring ( The adhesive force was defined as the force when the non-drying putty and the aluminum plate were peeled off by pulling in a direction perpendicular to the aluminum plate using an Ohba hand scale (for 10 kg). As a result, the adhesive strength was 4 kg or more.

Mouth・-・Bi Nomata■ ・Room temperature, -40°
Changes in the plasticity and adhesive strength of the non-drying putty at 70°C and 70°C were measured. The results are shown in Tables 1 and 2.

Table 1 (Change in plasticity over time) Table 2 (Change in adhesive strength over time) 0.1 each for hydrochloric acid, sodium hydroxide, and formalin
Aqueous solutions with concentrations of 1% and 1% were prepared, non-drying putty was immersed in these aqueous solutions for 1000 hours or 216 hours, the appearance of the non-drying putty after soaking was observed, and changes in plasticity and adhesive strength were observed. It was measured. The results are shown in Tables 3 and 4.

Table 3 (?A1 degree 0.1%, 1000 hours) Aluminum tank (cross section 610 mm x 610 mm; weight ff
When the sealing performance was measured by filling a 18 kg container with non-drying putty and placing it on an aluminum frame and filling a tank with water, no leakage was observed even under a high pressure difference of up to 40 inches of water.

Example 2 Organopolysiloxane KF-96H (Shin-Etsu Chemical ■
200 parts of Crystallite VX-3 (manufactured by Tatsumori Co., Ltd.), 60 parts of Humid Silica A-200 (manufactured by Nihon Erosil Co., Ltd.) and 1 part of polyethylene glycol were mixed with A non-drying putty was produced in the same manner.

The obtained non-drying putty was subjected to the following leak test.

As shown in Figure 1, attach the filter (610 x 610 x 290 + am) to the mounting frame 2 of the filter case 1.
The frame 4 of 3 was attached with non-drying putty 5 sandwiched between them.

This filter 3 was attached to an air port installed on a clean booth (not shown) so that air that had passed through the filter entered the clean booth.

Next, in the direction of arrow 6 shown in the figure, the wind
Air was sent into the Cleave booth through a filter at n. At this time, the air directly below the filter and the non-drying putty seal area (indicated by ■, ■, and ◎ in Fig. 1, respectively) before passing through the filter and after passing through the filter is sucked in an amount of 104.
The particles were sampled at a rate of 2/min, and the number of particles in each sample was measured using a dust particle counter KC-13 (manufactured by Rion Corporation). The results are shown in Table 5.

Example 3 The following three substances were used instead of K R112: RF-L
: Dimethylpolysiloxane oligomer with both ends capped with hydroxyl groups (manufactured by Shin-Etsu Chemical Co., Ltd.) vps : Vinylpropenylsilane ((KM Kagaku Kogyo Preparation GCF): Tetramethylguanidylpropyltrimethoxysilane (manufactured by Shin-Etsu Chemical Co., Ltd.) (mixture ratio: RF-L/VPS/GCF=10
A non-drying putty was produced in the same manner as in Example 1, except that a 20% acetone solution of 110.5) was used.

The specific gravity, plasticity and adhesive strength of the obtained non-drying putty were measured and found to be as follows.

Specific gravity: 1.44 Plasticity: 135 Adhesive crab 7 kg Example 4 Same as Example 1 except that 100 parts of KE-76BS (manufactured by Shin-Etsu Chemical Co., Ltd. 01e) was used as the organopolysiloxane and 100 parts of calcium hydroxide was used as the filler. A non-drying putty was produced.

The specific gravity, plasticity and adhesive strength of the obtained non-drying putty were measured and found to be as follows.

Specific gravity: 1.51 Plasticity: 260 Adhesive crab 7 kg [Effects of the invention] The non-drying putty of the present invention is an uncured molded product, so it is easy to handle and seal, and has excellent workability and is easy to install. Depending on the location, the weight of the connected parts (approximately 3 kg or more)
A sealing effect can be obtained simply by applying pressure to the non-drying putty, and since the surface has been treated with non-stick properties,
Non-drying putty does not stick to each other during storage. Furthermore, since the main material is organopolysiloxane, stable cleanliness can be maintained over a wide temperature range (-40 to +70'C). Furthermore, since no release sheet or the like is used, there is no possibility of contamination. Therefore, it is particularly suitable as a sealing material for clean rooms. Furthermore, when dimethylpolysiloxane with high viscosity is used as the organopolysiloxane, it has a large adhesive force and can exhibit a strong sealing effect against vibrations. In addition, there is a reinforcement material inside.
For example, a string-like material having plastic threads will not deform during storage or sealing operations and will not deteriorate its sealing performance.

[Brief explanation of the drawing]

FIG. 1 is a diagram illustrating the method of a leak test for non-drying putty conducted in Example 2. 1--------Filter case, 2-----1...
Mounting frame 2.3.--Filter, 4.--Frame for filter 3, 5.-111--Non-drying putty. Agent Patent Attorney Shushi Iwamiya

Claims (3)

[Claims] (1) A non-drying putty made of an uncured silicone composition containing (A) 100 parts by weight of an organopolysiloxane and (B) 20 to 500 parts by weight of a filler, the surface of which is subjected to a non-adhesive treatment. (2) The non-drying putty according to claim 1, which is a string-like molded product. (3) A non-drying putty according to claim 1 or 2, which has a reinforcing material inside.