JPH07179847A - Sealant - Google Patents

Abstract

PURPOSE:To obtain a sealant which has excellent handleability and workability and is esp. useful for on-site application to gaps of various shapes. CONSTITUTION:As a sealant is used a blended polymer material which mainly comprises an org. polymer material having a three-dimensional network structure and a low-molecular material in an amt. of the polymer material lower than that of the low-molecular material. The sealant has excellent sealing characteristics and applicability and is produced at a high productivity and a low cost.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sealing material, and more particularly to a sealing material having excellent handleability and workability.

[0002]

2. Description of the Related Art A sealing material is applied as a gap filling material to a joint portion of building members. In particular, as prefabricated buildings and lighter weight structures have been developed, it is necessary to further join building members, and thus the demand for sealing materials is increasing. However, with the increasing functionality of buildings in recent years,
The water solubility and airtightness of buildings are required to be improved, and the sealing materials are required to be further improved in sealing performance, handleability and workability.

Conventionally, there are two types of sealing materials, one of which is an amorphous type and which is filled on site, and the other of which is preliminarily molded. For example, the following materials are used.

Oil-based caulking material: a material obtained by kneading a mineral filler such as calcium carbonate and a liquid color-developing material such as oil or resin. Rubber-like caulking material (elastic sealant): Polysulfide-based, silicone-based, polyurethane-based, acrylic-based sealing material, etc. Glass putty: Similar in composition to the oil-based caulking material, and has high viscosity. Adhesive sealing material: Asphalt with rubber, butyl rubber, foamed plastic impregnated with asphalt. Gasket: Vinyl chloride or chloroprene gasket.

[0005]

As a sealing material, it has excellent sealing properties, that is, when it is filled in a joint, it closely follows the mutual displacement of the materials forming the gaps, resulting in cracks and cracks. In order to prevent defects such as impairing the airtightness, it is necessary to maintain flexibility for a long period of time, and of course, it must have excellent workability and workability (field workability). Due to the demand, further improvement of these properties is desired.

The present invention has been made in view of the above conventional circumstances, and is excellent in sealing property, handleability, and
It is an object of the present invention to provide a sealing material which is also excellent in workability.

[0007]

A sealing material according to claim 1 is a polymer having a high molecular weight organic material and a low molecular weight material as main components, and the content of the high molecular weight organic material is lower than that of the low molecular weight material. The blend material is characterized in that the polymer organic material is composed of a polymer blend material having a three-dimensional continuous network skeleton structure.

That is, the inventors of the present invention have conducted extensive studies on a sealing material having excellent properties, and as a result, the polymer blend material according to the present invention is excellent in handleability, and further, in conformity with the displacement of the gap. The present invention has been completed on the basis of the finding that it has excellent properties and that a very excellent sealing material can be obtained by using this polymer blend material.

The present invention will be described in detail below.

In the present invention, the high molecular weight organic material has a number average molecular weight of 20,000 or more, particularly 30,000.
A thermoplastic high molecular weight organic material of 0 or more, particularly 40,000 or more is preferable, and examples thereof include styrene-based (butadiene styrene-based, isoprene styrene-based), vinyl chloride-based, olefin-based (butadiene-based, isoprene-based, ethylene propylene-based). Etc.), ester-based, amide-based, urethane-based and other various thermoplastic elastomers, and their hydrogenated and other modified products, styrene-based, ABS-based,
Olefin series (ethylene series, propylene series, ethylene propylene series, ethylene styrene series, propylene styrene series, etc.), vinyl chloride series, acrylic ester series (methyl acrylate series, etc.), methacrylic acid ester series (methyl methacrylate series, etc.) , Carbonate type, acetal type, nylon type, halogenated polyether type (chlorinated polyether type, etc.), halogenated olefin type (tetrafluoroethylene type, fluorinated-ethylene chloride type, fluorinated ethylene propylene type, etc.), cellulose Examples thereof include thermoplastic resins such as resins (acetyl cellulose, ethyl cellulose, etc.), vinylidene, vinyl butyral, alkylene oxides (propylene oxide, etc.), and rubber modified products of these resins.

As the thermoplastic polymer material, it is particularly preferable to use a material in which a portion that easily forms a hard block such as a crystal structure or an aggregate structure and a soft block such as an amorphous structure are mixed together. Specifically,
The following (i) to (iii) are mentioned.

(I) Block copolymer of polyethylene and ethylene-styrene random copolymer obtained by hydrogenating a block copolymer of polybutadiene and butadiene-styrene random copolymer (ii) Polybutadiene and polystyrene Block copolymer of, or a block copolymer of polyethylene and polystyrene obtained by hydrogenating a block copolymer of polybutadiene or ethylene-butadiene random copolymer and polystyrene (iii) ethylene-propylene rubber Particularly, those having a block copolymer structure of polyethylene and an ethylene-styrene random copolymer are preferable.

These various thermoplastic polymer organic materials are mainly used alone, but two or more kinds may be blended and used.

On the other hand, as the low molecular weight material, the viscosity at 100 ° C. is 5 × 10 ⁵ centipoise or less, particularly 1 × 10 5.
It is preferably ⁵ centipoise or less, and from the viewpoint of molecular weight, the number average molecular weight of the low molecular weight material is 20,0.
00 or less, especially 10,000 or less, especially 5,000
The following is preferable. As such a low molecular weight material, a material that is liquid or liquid at room temperature is usually preferably used. Further, both hydrophilic and hydrophobic low molecular weight materials can be used. The low molecular weight material is not particularly limited, but the following materials are suitable.

Softener: Mineral oil-based, vegetable oil-based, synthetic-based softener for various rubbers or resins. Examples of the mineral oil-based oil include process oils such as aromatic oils, naphthene oils, and paraffin oils. As vegetable oils, castor oil, cottonseed oil, linseed oil, rapeseed oil, soybean oil, palm oil,
Examples include coconut oil, peanut oil, wood wax, pine oil, olive oil and the like.

Plasticizers: various ester plasticizers such as phthalic acid esters, mixed phthalic acid esters, aliphatic dibasic acid esters, glycol esters, fatty acid esters, phosphoric acid esters, stearic acid esters, epoxy plasticizers, etc. Plasticizer for plastics or phthalate type,
Adipate-based, sebacate-based, phosphate-based, polyether-based, polyester-based, etc. plasticizers for NBR.

Tackifier: Various tackifiers such as coumarone resin, coumarone-indene resin, phenol terpene resin, petroleum hydrocarbon, rosin derivative and the like.

Oligomer: Crown ether, fluorine-containing oligomer, polyisobutylene, xylene resin, chlorinated rubber, polyethylene wax, petroleum resin, rosin ester rubber, polyalkylene glycol diacrylate,
Liquid rubber (polybutadiene, styrene-butadiene rubber, butadiene-acrylonitrile rubber, polychloroprene, etc.), silicone-based oligomers, various oligomers such as poly-α-olefins.

Lubricants: Hydrocarbon lubricants such as paraffin and wax, fatty acid lubricants such as higher fatty acids and oxyfatty acids, fatty acid amide lubricants such as fatty acid amides and alkylenebisfatty acid amides, fatty acid lower alcohol esters, fatty acid polyhydric alcohol esters. , Ester-based lubricants such as fatty acid polyglycol esters, alcohol-based lubricants such as fatty alcohols, polyhydric alcohols, polyglycols and polyglycerols, various lubricants such as metal soaps and mixed lubricants.

In addition, latex, emulsion, liquid crystal, bituminous composition, clay, natural starch, sugar, inorganic silicon oil, phosphazene and the like are also suitable as the low molecular weight material. Further, animal oil such as beef oil, pig oil, horse oil, bird oil or fish oil: honey, fruit juice, or dairy products such as chocolate and yogurt, hydrocarbon-based, halogenated hydrocarbon-based, alcohol-based, phenol-based, ether System, acetal system, ketone system, fatty acid system, ester system,
Nitrogen compound-based, sulfur compound-based organic solvents: or various medicinal components, soil modifiers, fertilizers, petroleum, water, aqueous solutions and the like can also be used.

These low molecular weight materials may be used alone or in combination of two or more.

In the present invention, in order to obtain a polymer blend material containing a large amount of a low molecular weight material with a large amount of a low molecular weight material and a high molecular weight organic material, the solubility of each of the low molecular weight material and the high molecular weight organic material used Parameter value δ = ΔE / V)
^It is preferable to select both materials so that the difference of ^1/2 (ΔE = molar evaporation energy, V = molar volume) is 3.0 or less, preferably 2.5 or less. If this difference exceeds 3.0, from the viewpoint of compatibility of both materials, it is difficult to retain a large amount of low molecular weight materials, which is an obstacle to lowering the elastic modulus of the obtained polymer blend material. Is likely to occur, which is not preferable.

If necessary, the polymer blend material according to the present invention may further contain the following fillers. That is, clay, diatomaceous earth, carbon black, silica, talc, barium sulfate, calcium carbonate, magnesium carbonate, metal oxides, mica, graphite, scale-like inorganic fillers such as aluminum hydroxide, various metal powders,
Wood chips, glass powder, ceramics powder, granular or powder solid filler such as granular or powder polymer, other various natural or artificial short fibers, long fibers (for example, straw, hair, glass fiber, metal fiber, various other Polymer fibers and the like) can be blended.

Further, it is possible to reduce the weight by blending a hollow filler, for example, an inorganic hollow filler such as a glass balloon or a silica balloon, or an organic hollow filler made of polyvinylidene fluoride, a polyvinylidene fluoride copolymer or the like. . Further, in order to improve various physical properties such as weight reduction, it is possible to mix various foaming agents, and it is also possible to mechanically inject gas during mixing or the like.

The polymer blend material constituting the sealing material of the present invention has an adhesive force of 0.1 kg with the object to be sealed.
/ Cm ² or more, preferably 0.2 kg / cm ² or more, and the elongation at break of the sealing material itself is 100% or more, preferably 200% or more. If the adhesive strength with the object to be sealed is less than 0.1 kg / cm ² , the sealing material and the object to be sealed are likely to peel off, and sufficient sealing properties may not be exhibited. If the elongation at break of the sealing material itself is less than 100%, the sealing material may not be able to follow up and may not exhibit sufficient sealing characteristics, especially when vibration or deformation is applied to the sealing part.

The adhesive strength means that a polymer blend material is molded into a size of 2.5 cm × 2.5 cm to a thickness of 1.0 cm, and a test piece (5 cm × 5 cm ×) of an object to be sealed such as concrete, foam board or foam concrete. A sample for adhesion test made by sandwiching with 2 sheets (1 cm, arbitrary thickness) and pressing with a load of 100 kg / cm ² at room temperature 50 mm /
The value was calculated from the value when the polymer blend material was pulled off at the speed of minutes and peeled off.

The elongation at break refers to a value obtained by measuring a polymer blend material according to a tensile test method for vulcanized rubber (JIS K6251).

In order to have such characteristics, the three-dimensional continuous reticulated skeleton structure formed of the polymer organic material that constitutes the polymer blend material has an average diameter of the skeleton of 50 μm.
m or less, preferably 30 μm or less, the average diameter of cells (mesh) is 500 μm or less, preferably 300 μm or less, and the volume fraction of the polymer organic material is [volume of polymer organic material / (volume of polymer organic material + Volume of low molecular weight material)] ×
When defined as 100 (%), the volume fraction of the polymer organic material is preferably 30% or less, and particularly preferably 25% or less.

The polymer blend material used in the present invention comprises a predetermined amount of a high molecular weight organic material and a low molecular weight material, and if necessary, other compounding agents, and the high molecular weight organic material forms a three-dimensional continuous network skeleton structure. It can be obtained by mixing under possible mixing conditions. In this case, while having a uniform three-dimensional continuous network skeleton structure of a high molecular weight organic material,
In order to obtain a polymer blend material having a low bleed of low molecular weight materials and satisfying the above-mentioned characteristics, it is preferable to use a high shear type mixer as the mixer, especially, between the fixed wall and the rotating rotor. It can give high shearing force and high shearing rate with fixed wall and rotating part (rotor).
The shearing speed V of the rotor is V (m / sec), the distance (clearance) is t (m), and the rotational peripheral speed of the rotor is v (m / sec).
Is defined as V = v / t (sec ⁻¹ ), V ≧ 5.0 × 10 ² (sec ⁻¹ ) preferably V ≧ 1.0 × 10 ³ (sec ⁻¹ ) and more preferably V ≧ 2 0.5 × 10 ³ (sec ⁻¹ ) Most preferably, a high shear type special mixer satisfying V ≧ 5.0 × 10 ³ (sec ⁻¹ ) is advantageously used.

The polymer blend material according to the present invention is not particularly limited such as ordinary bulk, gel, foam, etc., but it is in a gel state, particularly a three-dimensional continuous uniform network made of a thermoplastic polymer material. Those in a gel state having a skeletal structure are particularly effective for the present invention.

The sealing material of the present invention may be an in-situ sealing material for in-situ filling or a pre-molded sealing material, and the constitution thereof is not particularly limited, and the above-mentioned polymer blend is used. It may be composed of only materials, or may be used by laminating two or more kinds of the above-mentioned polymer blend materials having different characteristics. Furthermore, iron,
It may be used in combination with a metal material such as aluminum, copper, zinc, and stainless, or various ceramic materials. Further, the surface layer of the polymer blend material may be coated with an organic material such as urethane, polyvinyl acetate or silicone.

It is to be noted that, if the amorphous sealing material for on-site filling is used, an appropriate amount may be embedded in the sealing portion on site and used. Also, in the case of preformed,
For example, a water-repellent tape-shaped cloth or film polymer blend material is molded into a tape with a predetermined thickness, a tape-shaped release paper is attached to the surface, and cut with scissors or a knife to a predetermined length. Can be used.

The sealing material of the present invention is particularly useful as an amorphous in-situ filling material for sealing the outer wall of a house, indoor and outdoor wall surfaces, around water (pipes and sinks), window frames and the like.

[0034]

[Function] Mainly composed of high molecular weight organic materials and low molecular weight materials,
A polymer blend material in which the content of the high molecular weight organic material is lower than that of the low molecular weight material, and the high molecular weight organic material has a three-dimensional continuous network skeleton structure, is soft and appropriate. A sealing material that has elasticity and sufficiently satisfies the required properties as a sealing material in terms of compression characteristics, hardness, etc., and can be economically manufactured with high productivity. In particular, when a thermoplastic polymer organic material is used, a sealing material having excellent filling properties and recyclability is provided.

[0035]

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

Example 1 The materials shown in Table 1 are blended as shown in Table 1 by using a high-shear type special mixer ("TK Auto Homo Mixer" manufactured by Tokushu Kika Kogyo Co., Ltd.). Mixing under mixing conditions gave a polymer blend material with a uniform appearance.

After the completion of mixing, the obtained polymer blend material was used as a sealing material for the outer wall of the house and was pressed and filled into the gap of the curtain wall at the site, and it was extremely easy to perform the sealing work. Moreover, it was confirmed that sufficient sealing performance was exhibited without causing cracks or the like for a long period of time.

The adhesive force of this polymer blend material was 2.3 kg / cm ² , and the elongation at break was 900%.
Also, when a section of this polymer blend material was cut out and observed with an optical microscope, a three-dimensional continuous network structure (average diameter of skeleton: 15 μm, average diameter of cells: 25 μm) of a thermoplastic polymer organic material was formed. Was confirmed.

[0039]

[Table 1]

[0040]

As described in detail above, according to the sealing material of the present invention, it is possible to manufacture the sealing material with excellent sealing characteristics, handleability, workability and workability, and with high productivity.
A sealing material having excellent economical efficiency is provided.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Yuichiro Wakana 3-5-5 Ogawa Higashimachi, Kodaira-shi, Tokyo (72) Inventor Miei Fukahori 2-9-7 Sanada-cho, Hachioji-shi, Tokyo

Claims (1)

[Claims] 1. A polymer blend material comprising a high molecular weight organic material and a low molecular weight material as main components, wherein the content of the high molecular weight organic material is lower than that of the low molecular weight material, and the high molecular weight organic material is a tertiary compound. A sealing material composed of a polymer blend material having an original continuous network skeleton structure.