JPH09124953A - Resin composition for microwave fusion - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a resin composition for microwave fusion which gives high quantity of heat with high heat exchange rate, enables fusion bonding without being influenced by the state of deterioration of resin and provides high fusion bonding strength. SOLUTION: This resin composition consists of 100 pts.wt. thermoplastic resin, 5-100 pts.wt. fine conductive aniline polymer particles and 0.01-20 pts.wt. titanate coupling agent and/or aluminum-base coupling agent. The fine conductive aniline polymer particles are surface treated beforehand with 0.01-10 pts.wt. titanate coupling agent and/or aluminum-base coupling agent.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resin composition for microwave fusion, and more particularly, to a synthetic resin pipe for water and sewerage, a synthetic resin pipe for gas, and other adherends having a heat fusion property. The present invention relates to a resin composition for microwave fusion, which is preferably used for joining and the like.

[0002]

2. Description of the Related Art A resin fusion method utilizing dielectric heating by microwaves is disclosed in, for example, Japanese Patent Application Laid-Open No. 62-39221, and a connecting portion of a polyolefin resin molded article which is an adherend. A method for fusing a fusion material obtained by kneading a polyolefin resin and carbon black between the two, and applying a high frequency to the fusion material scissor portion to fuse the polyolefin resin molded product, and JP-B-5-11022. As disclosed in, a vinyl chloride resin, a polyamide resin, an ethylene-vinyl acetate copolymer, a polyester resin having a large dielectric loss value between welding surfaces of a thermoplastic resin having a small dielectric loss value, which is an adherend. There is a method of arranging a heat generating material made of, for example, and heating the heat generating material by high frequency induction heating or high frequency induction heating to fuse the thermoplastic resin. In addition, as disclosed in JP-A-5-504153, by irradiating a conductive polymer such as polyaniline with microwaves, the conductive polymer is dielectrically heated to fuse the resin. There are ways to do it.

However, in the fusing material using carbon black, since the carbon black itself generates heat at a high temperature,
There are problems such as deterioration of the resin and difficulty in controlling the heat generation temperature. Further, when a resin having a large dielectric loss is used, there is a problem that it takes a long time to raise the temperature.
Further, when polyaniline is used, it is difficult to uniformly disperse polyaniline having a large polarity in a thermoplastic resin, and to maintain good adhesiveness with the thermoplastic resin at the polyaniline fine particle interface. When a thermoplastic resin product is fused by irradiating a heat-generating material composed of a poorly heat-resistant thermoplastic resin composition with microwaves, the polyaniline is locally deteriorated by high heat and self-deteriorates. Problems such as a decrease in peel strength occur.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above, and has a high heat exchange rate, a high heat quantity can be obtained, and fusion can be performed without being affected by the deterioration state of the resin.
Moreover, it aims at providing the resin composition for microwave fusion with high fusion strength.

[0005]

The present invention according to claim 1 provides 100 parts by weight of a thermoplastic resin, 5 to 100 parts by weight of conductive aniline polymer fine particles, a titanate coupling agent and / or an aluminum cup. Ring agent 0.
The gist is a resin composition for microwave fusion, which is characterized by being composed of 01 to 20 parts by weight.

The present invention according to claim 2 provides a thermoplastic resin 1
And 100 parts by weight of conductive aniline-based polymer particles 100
Titanate coupling agent and / or
Or a resin composition for microwave fusion, which comprises 5 to 100 parts by weight of conductive aniline-based polymer fine particles surface-treated with 0.01 to 10 parts by weight of an aluminum coupling agent. It is what

The thermoplastic resin is not particularly limited as long as it is a thermoplastic resin that can be extrusion-molded or injection-molded, and examples thereof include polyethylene, polypropylene, polybutene-1, poly-4-methylpentene-1 and the like. Polyolefin: Vinyl chloride resin, polycarbonate, polyester, polyamide, acrylic resin, polyphenylene sulfide (PPS), polyvinylidene fluoride (PVD)
F), polyvinylidene chloride (PVDC), perfluoroalkoxy fluororesin (PFA) and the like. These may be used alone or in combination of two or more.

The above conductive aniline polymer fine particles are
It is not particularly limited as long as it is conductive, and among them, an aniline-based polymer having a conductivity of 0.1 S / cm or more is preferable. When the conductivity is lower than 0.1 S / cm, heat generation is insufficient and fusion is insufficient, which is not preferable.

The above aniline-based polymer fine particles are, for example,
The aniline derivative monomer and the acid are dissolved in a solvent such as water, and an oxidant is added to this solution, and the mixture is stirred to carry out oxidative polymerization.

Examples of the aniline derivative monomer include aniline, N-methylaniline, N-ethylaniline, o-toluidine, m-toluidine, 2-ethylaniline, 3-ethylaniline, 2,3-dimethylaniline, 2 , 5-dimethylaniline, 2,6-dimethylaniline, 2,6-diethylaniline, 2-methoxyaniline, 3-methoxyaniline, 2,5-dimethoxyaniline, 3,5-dimethoxyaniline, o-phenylenediamine, m -Phenylenediamine, 2-aminobiphenyl, N, N-diphenyl-p-phenylenediamine and the like can be mentioned. The concentration of the aniline derivative monomer in the solvent is preferably 0.1 to 1 mol / l.

Examples of the acid include inorganic protonic acids such as hydrochloric acid, sulfuric acid, nitric acid and phosphoric acid; inorganic acid esters such as sulfuric acid ester and phosphoric acid ester; organic acids such as p-toluenesulfonic acid and carboxylic acid; polystyrene. Polymeric acids such as sulfonic acid may be mentioned. The concentration of the acid is 0.1 N
1N is preferred.

Examples of the oxidizing agent include persulfate,
Examples thereof include peroxides such as hydrogen peroxide, permanganate, and dichromate; Lewis acids such as lead dioxide, manganese dioxide, and iron chloride. The concentration of the oxidizing agent is preferably 0.1 to 1 mol / l with respect to the solvent.

The above conductive aniline polymer fine particles are
It can be prepared by the above method, but a commercially available product such as "Versicon" manufactured by Allied Signal Co. can also be used.

The above conductive aniline polymer fine particles are
Disperse 5 to 100 parts by weight in 100 parts by weight of the thermoplastic resin. If the amount is less than 5 parts by weight, the calorific value becomes insufficient, and if the amount exceeds 100 parts by weight, the strength of the resin composition for microwave fusion is reduced, so the amount is limited to the above range.

The conductive aniline polymer fine particles dispersed in the thermoplastic resin have a particle diameter of 0.1 to 0.1.
It is desirable to use those having a particle size in the range of 100 μm. When the particle diameter is less than 0.1 μm, it becomes difficult to disperse the particles in the thermoplastic resin, and excessive kneading causes deterioration of the thermoplastic resin. On the other hand, if the particle diameter exceeds 100 μm, a sufficient amount of heat generated during microwave heating cannot be obtained and the fusion strength is reduced.

The dispersed particle size of the conductive aniline polymer fine particles is not particularly limited as long as it can accurately measure the particle size. For example, RuO _{4 is} previously prepared.
When the resin composition for microwave fusion dyed with is observed by backscattered electrons of a scanning electron microscope, it can be measured relatively easily.

The titanate coupling agent is not particularly limited, and examples thereof include isopropyl triisostearoyl titanate, isopropyl tris (dioctyl pyrophosphate) titanate, isopropyl tri (N-aminoethyl-aminoethyl) titanate, Tetraoctyl bis (ditridecyl phosphite) titanate, tetra (2,2-diallyloxymethyl-1-butyl) bis (ditridecyl) phosphite titanate, bis (dioctyl pyrophosphate) oxyacetate titanate, bis (dioctyl pyrophosphate) ethylene Titanate, isopropyl trioctanoyl titanate, isopropyl dimethacryl isostearoyl titanate, isopropyl tridodecylbenzenesulfonyl titanate Over DOO, isopropyl isostearoyl diacryl titanate, isopropyl tricumylphenyl titanate, tetraisopropyl bis (dioctyl phosphite) titanate. The aluminum-based coupling agent is not particularly limited, and examples thereof include acetoalkoxy aluminum diisopropylate. The above coupling agents are used alone or in combination of two or more.

The titanate coupling agent and / or the aluminum coupling agent is blended in an amount of 0.01 to 20 parts by weight per 100 parts by weight of the thermoplastic resin.
If the blending amount is less than 0.01 parts by weight, the conductive aniline-based polymer fine particles are not sufficiently dispersed in the thermoplastic resin, so that the heating element made of such a microwave fusion resin composition is subjected to microwave irradiation. When the thermoplastic resin moldings are connected to each other by causing heat to be generated, the heat generation characteristics of the resin composition for microwave fusion at the connection portion are deteriorated, and the fusion between the thermoplastic resin moldings becomes incomplete and the connection strength is increased. Is reduced. or,
If the blending amount is more than 20 parts by weight, the connection strength of the connecting portion is lowered when the thermoplastic resin molded products are mutually connected as described above.

In the microwave fusion resin composition of the present invention as set forth in claim 2, the conductive aniline-based polymer fine particles are previously added to 100 parts by weight of the conductive aniline-based polymer fine particles. Titanate coupling agent and /
Or 0.01 to 10 parts by weight of an aluminum-based coupling agent is surface-treated, and the conductive aniline-based polymer fine particles which have been surface-treated in advance are mixed and kneaded, or Further, if necessary, the remaining titanate coupling agent and / or aluminum coupling agent are mixed and kneaded to prepare a resin composition for microwave fusion.

The conductive aniline polymer fine particles which have been surface-treated with the titanate-based coupling agent and / or the aluminum-based coupling agent in advance are the microwave fusion resin of the present invention according to claim 1 as described above. Even if it is not previously surface-treated with all the amounts of the titanate coupling agent and / or aluminum coupling agent blended in the composition, the polarity of the electrically conductive aniline polymer fine particles having high polarity is kneaded. Of the thermoplastic resin. Therefore, in the resin composition for microwave fusion of the present invention according to claim 2, use of the titanate-based coupling agent and / or the aluminum-based coupling agent, which is previously used for the surface treatment of conductive aniline-based polymer fine particles. The amount of the titanate coupling agent and / or the aluminum coupling agent is 0.01 to 1 with respect to 100 parts by weight of the conductive aniline polymer fine particles.
0 parts by weight.

If the amount of the titanate coupling agent and / or the aluminum coupling agent used for the surface treatment of the conductive aniline polymer fine particles is less than 0.01 parts by weight, the surface treatment described above is performed. Since the electrically conductive aniline-based polymer fine particles are not sufficiently dispersed in the thermoplastic resin, a heating element made of such a microwave fusion resin composition is heated using microwaves,
When the thermoplastic resin moldings are connected to each other, the heat generation characteristics of the resin composition for microwave fusion at the connection portion are deteriorated, the fusion between the thermoplastic resin moldings is incomplete, and the connection strength is deteriorated. When the amount used exceeds 10 parts by weight, the surface-treated conductive aniline-based polymer fine particles agglomerate with each other and are not sufficiently dispersed in the thermoplastic resin. If you connect your bodies to each other,
The connection strength of the connection portion is reduced.

The method for producing the resin composition for microwave fusion of the present invention according to claim 1 is not particularly limited, but for example, a single-screw extruder, a twin-screw extruder, a Banbury mixer, a kneading roll, Brabender Plastograph,
A kneading device such as a kneader is used alone or in combination with these devices as appropriate, conductive aniline-based polymer fine particles and a titanate-based coupling agent and / or an aluminum-based coupling agent are added to the thermoplastic resin, It is manufactured by kneading at the melting temperature of the thermoplastic resin.

The method for producing the microwave fusion resin composition of the present invention according to claim 2 is not particularly limited, but, for example, a conductive aniline-based resin under high-speed agitation using a high-speed agitator is used. A solution containing a titanate-based coupling agent and / or an aluminum-based coupling agent or a titanate-based coupling agent and / or an aluminum-based coupling agent is added dropwise or sprayed to the coalesced fine particles, and sufficient stirring is continued, The coating of the titanate coupling agent and / or the aluminum coupling agent is adhered to the surface of the conductive aniline polymer fine particles as uniformly as possible, followed by drying to form the conductive aniline polymer fine particles. A method for producing the resin composition for microwave fusion according to the present invention as set forth in claim 1, which is surface-treated in advance and then added to a thermoplastic resin. It is prepared by kneading at the melting temperature of the likewise thermoplastic resin.

Further, if necessary, an ultraviolet absorber, an antioxidant, a flame retardant, a plasticizer, a lubricant, an antistatic agent, a coloring agent, etc. may be added to the resin composition for microwave fusion of the present invention. Good.

The microwave fusion resin composition of the present invention comprises:
For example, although it may be used as a material for molding the entire molded body having a joint portion such as a thermoplastic resin pipe joint, only a portion requiring joining of the thermoplastic resin molded body, for example, an injection molding by injection molding Alternatively, it may be embedded in the molded body or exposed on the surface by a laminating method using a laminator or the like. Further, for example, in the butt joining in which the pipe end faces of the thermoplastic resin pipe are abutted and fused to each other, when the annular sheet is sandwiched by the abutting face of the thermoplastic resin pipe to the end face of the pipe end, It may be used as a resin sheet for microwave fusion.

A resin for microwave fusion such as a resin sheet for microwave fusion to be embedded in or exposed to the surface only in a portion of the thermoplastic resin molded body that needs to be joined, or to be interposed between the joined portions. The thickness of the composition part is
It is about 0.01 to 5 mm. If the thickness of the resin composition portion for microwave fusion is less than 0.01 mm, the amount of heat generated is insufficient, and if the thickness exceeds 5 mm, the machine of the joint portion of the thermoplastic resin molded article to be joined after fusion bonding. Strength decreases.

The above-mentioned resin sheet for microwave fusion is a resin sheet for microwave fusion in which a thermoplastic resin sheet compatible with the thermoplastic resin molding to be joined is laminated on a sheet made of a resin composition for microwave fusion. It may be.
Further, the microwave fusion resin sheet in which the thermoplastic resin sheet compatible with the thermoplastic resin molding to be bonded is laminated has two layers, and a sheet made of the microwave fusion resin composition has the above heat treatment. Various applications can be made depending on the structure and application of the thermoplastic resin molded product to be bonded or the thermoplastic resin molded product for bonding, such as a thermoplastic resin sheet laminated in a sandwich.

The microwaves that are irradiated to integrally fuse the resin composition for microwave fusion of the present invention with the thermoplastic resin molding to be joined are, for example, commercial frequencies of 2.
The power is preferably 100 to 2,000 W at 45 GHz.

The microwave irradiation time varies depending on the size and shape of the adherend to be joined, but for example, a medium density polyethylene pipe for gas may be applied to the inner surface of a pipe joint made of the same material as the microwave fusion resin. When the sheet is joined to a microwave fusion tube fitting which is embedded and fused, the microwave is irradiated by a dedicated microwave irradiator to complete the fusion, and the irradiation time is 10 seconds to 180 seconds. Is.

Since the microwave fusion resin composition of the present invention according to claim 1 is constructed as described above, the conductive aniline polymer fine particles are finely dispersed in the thermoplastic resin. The molded body for bonding obtained from the resin composition for microwave fusion is heated uniformly and efficiently to the melting temperature of the thermoplastic resin molded body to be bonded when dielectric heating is performed by irradiating with microwaves. The thermoplastic resin molding to be joined is fused without deterioration of the thermoplastic resin due to overheating. Furthermore, since the adhered state at the interface between the thermoplastic resin and the conductive aniline-based polymer particles in the fused portion of the thermoplastic resin molded product is strong, excellent fusion strength can be obtained.

Since the resin composition for microwave fusion of the present invention according to claim 2 is constructed as described above, a polar composition in which conductive aniline polymer fine particles are finely dispersed in a thermoplastic resin is used. The property of the surface of the electrically conductive aniline-based polymer fine particles having high strength is extremely close to the property of the bonding surface of the thermoplastic resin molded product to be bonded, and the molded product for bonding obtained from the microwave fusion resin composition is When waves are applied and dielectric heating is performed, the melting temperature of the thermoplastic resin molding to be joined is raised uniformly and efficiently, and the thermoplastic resin molding to be joined is fused without deterioration of the thermoplastic resin due to partial overheating. To do. Furthermore, since the adhesion state at the interface between the thermoplastic resin and the conductive aniline-based polymer fine particles in the fusion-bonded portion of the thermoplastic resin molding is strong, more excellent fusion-bonding strength can be obtained.

[0032]

The present invention will be described in more detail with reference to the following examples, but the present invention is not limited to these examples.

(Example 1) Medium density polyethylene (manufactured by Mitsui Petrochemical Co., Ltd., 190 ° C, 2.16 kg, MFR = 0.2)
g / 10 min) 100 parts by weight, isopropyl triisostearoyl titanate (manufactured by Ajinomoto Co.) 0.5 part by weight, and conductive aniline polymer fine particles (manufactured by Allied Signal Co., trade name: Versicon) 20 parts by weight Brabender Plast. It was kneaded at 160 ° C. with a graph (manufactured by Toyo Seiki Co., Ltd.) to prepare a resin composition for microwave fusion.

The obtained microwave fusion resin composition was molded into a sheet having a thickness of 0.5 mm by a press molding machine, and 2
A resin sheet for microwave fusion of 0 mm × 10 mm was prepared, and the thickness of the medium density polyethylene was 4 mm and 10 mm.
Scissors are inserted between two strips of 80 mm, and microwaves (2.45 GHz, 500 W) are irradiated onto the strips of medium-density polyethylene to melt the strips of medium-density polyethylene. I wore it.

The strip sheet made of the medium-density polyethylene fused with the microwave fusion resin sheet was subjected to a peel test at a pulling speed of 50 mm / min by a tensile tester to measure the peel strength, and the peel strength 14 .2 kgf / c
m was obtained.

(Example 2) 0.5 parts by weight of isopropyltriisostearoyl titanate of Example 1 was added to 1 part.
A resin composition for microwave fusion was prepared in the same manner as in Example 1 except that the weight part was changed. In the same manner as in Example 1, a microwave fusion resin sheet was prepared from the obtained microwave fusion resin composition, and a medium-density polyethylene strip sheet was fused to each other using the microwave fusion resin sheet. did. The peel strength of the fused medium-strength polyethylene strip sheet was measured in the same manner as in Example 1 to obtain a peel strength of 14.1 kgf / cm.

Example 3 A resin composition for microwave fusion in the same manner as in Example 2 except that the amount of the conductive aniline polymer fine particles added in Example 2 was changed from 20 parts by weight to 30 parts by weight. Was produced. In the same manner as in Example 2, a microwave fusion resin sheet was prepared from the obtained microwave fusion resin composition, and medium-density polyethylene strip sheets were fused to each other using the microwave fusion resin sheet. did.
The peel strength of the fused medium-density polyethylene strip-shaped sheet was measured in the same manner as in Example 2, and the peel strength was 12.7 k.
gf / cm was obtained.

(Example 4) 0.5 parts by weight of isopropyltriisostearoyl titanate of Example 1 was added to 2 parts.
A resin composition for microwave fusion was produced in the same manner as in Example 1 except that the amount of the conductive aniline-based polymer particles was changed to 20 parts by weight and the amount of conductive aniline-based polymer particles was changed to 40 parts by weight. In the same manner as in Example 1, a microwave fusion resin sheet was prepared from the obtained microwave fusion resin composition, and a medium-density polyethylene strip sheet was fused to each other using the microwave fusion resin sheet. did. The peel strength of the fused medium-density polyethylene strip-shaped sheet was measured in the same manner as in Example 1 to obtain a peel strength of 10.5 kgf / cm.

(Example 5) In the same manner as in Example 1 except that 1 part by weight of bis (dioctylpyrophosphate) oxyacetate titanate (manufactured by Ajinomoto Co.) was used instead of the isopropyltriisostearoyl titanate of Example 1. A resin composition for microwave fusion was prepared. In the same manner as in Example 1, a microwave fusion resin sheet was prepared from the obtained microwave fusion resin composition, and a medium-density polyethylene strip sheet was fused to each other using the microwave fusion resin sheet. did. The peel strength of the fused medium-density polyethylene strip-shaped sheet was measured in the same manner as in Example 1 to obtain a peel strength of 14.0 kgf / cm.

Example 6 Microwave fusion was carried out in the same manner as in Example 1 except that 1 part by weight of isopropyl tricumyl phenyl titanate (manufactured by Ajinomoto Co.) was used in place of the isopropyl triisostearoyl titanate of Example 1. A resin composition was prepared. In the same manner as in Example 1, a microwave fusion resin sheet was prepared from the obtained microwave fusion resin composition, and a medium-density polyethylene strip sheet was fused to each other using the microwave fusion resin sheet. did.
The peel strength of the fused medium-strength polyethylene strip sheet was measured in the same manner as in Example 1, and the peel strength was 14.8 k.
gf / cm was obtained.

Example 7 Microwave melting was carried out in the same manner as in Example 1 except that 1 part by weight of acetoalkoxyaluminum diisopropylate (manufactured by Ajinomoto Co.) was used instead of isopropyltriisostearoyl titanate of Example 1. A wearing resin composition was prepared. In the same manner as in Example 1, a microwave fusion resin sheet was prepared from the obtained microwave fusion resin composition, and a medium-density polyethylene strip sheet was fused to each other using the microwave fusion resin sheet. did. The peel strength of the fused medium-strength polyethylene strip sheet was measured in the same manner as in Example 1, and the peel strength was 1
4.8 kgf / cm was obtained.

(Example 8) The addition amount of acetoalkoxyaluminum diisopropylate of Example 7 was changed to 5 parts by weight.
A resin composition for microwave fusion was prepared in the same manner as in Example 7, except that the amount of conductive aniline-based polymer particles was changed to 20 parts by weight and the amount of conductive aniline-based polymer particles was changed to 40 parts by weight. In the same manner as in Example 7, a microwave fusion resin sheet was prepared from the obtained microwave fusion resin composition, and medium-density polyethylene strip sheets were fused to each other using the microwave fusion resin sheet. did. The peel strength of the fused medium-strength polyethylene strip sheet was measured in the same manner as in Example 7 to obtain a peel strength of 13.2 kgf / cm.

Example 9 Medium density polyethylene of Example 3 (manufactured by Mitsui Petrochemical Co., Ltd., 190 ° C., 2.16 kg, MF)
R = 0.2 g / 10 min) In place of 100 parts by weight, high density polyethylene (manufactured by Mitsui Petrochemical Co., 190 ° C., 2.
A resin composition for microwave fusion was prepared in the same manner as in Example 3 except that 100 parts by weight of 16 kg and MFR = 0.4 g / 10 min) was used. In the same manner as in Example 3, a microwave fusion resin sheet was prepared from the obtained microwave fusion resin composition, and medium density polyethylene strip-shaped sheets were fused to each other using the microwave fusion resin sheet. did. The peel strength of the fused medium-strength polyethylene strip sheet was measured in the same manner as in Example 3, and the peel strength was 1
4.3 kgf / cm was obtained.

(Example 10) (Preparation of conductive aniline-based polymer fine particles surface-treated with isopropyltriisostearoyl titanate) Using a super mixer, 100 parts by weight of conductive aniline-based polymer fine particles were mixed with isopropyl. 0.5 parts by weight of triisostearoyl titanate was added under high speed stirring, thoroughly stirred, and then dried to prepare conductive aniline-based polymer fine particles surface-treated with isopropyltriisostearoyl titanate.

Conductive aniline polymer fine particles 2 surface-treated with 100 parts by weight of medium-density polyethylene of Example 1 and the above-mentioned isopropyltriisostearoyl titanate.
A resin composition for microwave fusion was prepared in the same manner as in Example 1 except that 0 part by weight was used. In the same manner as in Example 1, a microwave fusion resin sheet was prepared from the obtained microwave fusion resin composition, and a medium-density polyethylene strip sheet was fused to each other using the microwave fusion resin sheet. did. The peel strength of the fused medium-density polyethylene strip-shaped sheet was measured in the same manner as in Example 1, and the peel strength was 18.6 kgf.
/ Cm was obtained.

(Examples 11 to 20) The resin compositions for microwave fusion of Examples 1 to 10 were used and each had an inner diameter of 34 m.
A cylindrical molded body having m, a thickness of 1 mm and a length of 30 mm was produced. After mounting each of the above cylindrical molded bodies on the core part of the insert mold for polyethylene pipe joint (socket),
Injection molding the medium density polyethylene used in Example 1,
A polyethylene pipe joint (socket) was produced in which the cylindrical molded body of the resin composition for microwave fusion was inserted into the inner surface of the socket (thickness 10 mm, inner diameter 34 mm).

In the polyethylene pipe joint (socket),
The two tubes of medium density polyethylene used in Example 1 having an outer diameter of 34 mm and a thickness of 4 mm were joined to each other by microwave (2.45 mm).
GHz, 600 W) for 90 seconds, and the medium density polyethylene pipe was fusion-bonded with the medium density polyethylene pipe joint (socket).

In order to evaluate the fusion performance of the fusion-bonded medium-density polyethylene pipe and medium-density polyethylene pipe joint (socket), a hot internal pressure test (80 ° C., 0.78 MPa)
Was done. As a result of the hot internal pressure test, no abnormality such as water leakage or breakage was observed in any of the joints for 1,000 hours.

Comparative Example 1 The same as Example 1 except that the isopropyl triisostearoyl titanate of Example 1 was not used and the addition amount of the conductive aniline polymer fine particles was changed to 20 parts by weight to 60 parts by weight. Then, a resin composition for microwave fusion was prepared. In the same manner as in Example 1, a microwave fusion resin sheet was prepared from the obtained microwave fusion resin composition, and a medium-density polyethylene strip sheet was fused to each other using the microwave fusion resin sheet. did. The peel strength of the fused medium-strength polyethylene strip sheet was measured in the same manner as in Example 1, and the peel strength was 6.4.
kgf / cm was obtained.

(Comparative Example 2) 0.5 part by weight of the isopropyltriisostearoyl titanate of Example 1 was added to 3 parts.
A resin composition for microwave fusion was prepared in the same manner as in Example 1 except that the amount of the conductive aniline-based polymer particles was changed to 20 parts by weight and the amount of conductive aniline-based polymer particles was changed to 150 parts by weight. In the same manner as in Example 1, a microwave fusion resin sheet was prepared from the obtained microwave fusion resin composition, and a medium-density polyethylene strip sheet was fused to each other using the microwave fusion resin sheet. did. The peel strength of the fused and fused medium-density polyethylene strip-shaped sheet was measured in Example 1.
The peel strength was 2.4 kgf / cm.

(Comparative Example 3) A resin composition for microwave fusion was prepared in the same manner as in Example 2 except that the addition amount of the conductive aniline polymer fine particles of Example 2 was changed to 20 parts by weight. Was produced. In the same manner as in Example 1, a microwave fusion resin sheet was prepared from the obtained microwave fusion resin composition, and a medium-density polyethylene strip sheet was fused to each other using the microwave fusion resin sheet. I tried to do this, but the heat was not enough and the fusion did not occur.

(Comparative Example 4) 0.5 parts by weight of isopropyltriisostearoyl titanate of Example 1 was added to 2 parts.
A resin composition for microwave fusion was prepared in the same manner as in Example 1 except that the amount was changed to 5 parts by weight and the amount of conductive aniline-based polymer particles added was changed to 20 parts by weight from 60 parts by weight. In the same manner as in Example 1, a microwave fusion resin sheet was prepared from the obtained microwave fusion resin composition, and a medium-density polyethylene strip sheet was fused to each other using the microwave fusion resin sheet. did. The peel strength of the fused and fused medium-density polyethylene strip-shaped sheet was measured in Example 1.
The peel strength was 2.8 kgf / cm.

Table 1 shows the evaluation results of the above Examples 1 to 10 and Comparative Examples 1 to 4. In the table, medium density polyethylene is abbreviated as MDPE, high density polyethylene is abbreviated as HDPE, and conductive aniline-based polymer particles are abbreviated as polyaniline. Also, the type of coupling agent used is shown in Table 1 with the following numbers.

Coupling agent: isopropyl triisostearoyl titanate Coupling agent: bis (dioctyl pyrophosphate) oxyacetate titanate Coupling agent: isopropyl tricumyl phenyl titanate Coupling agent: acetoalkoxyaluminum diisopropylate

Further, the conductive aniline polymer fine particles which have been surface-treated with isopropyltriisostearoyl titanate in advance are abbreviated as treated polyaniline.

[0056]

[Table 1]

[0057]

EFFECT OF THE INVENTION Since the resin composition for microwave fusion of the present invention according to claim 1 is constituted as described above, the conductive aniline polymer fine particles are finely dispersed in the thermoplastic resin. The molded article for bonding obtained from the resin composition for microwave fusion is heated uniformly and efficiently to the melting temperature of the thermoplastic resin molded article to be bonded when dielectric heating is performed by irradiating microwaves, The thermoplastic resin molding to be joined is fused without deterioration of the thermoplastic resin due to partial overheating. Furthermore, since the adhered state at the interface between the thermoplastic resin and the conductive aniline-based polymer particles in the fused portion of the thermoplastic resin molded product is strong, excellent fusion strength can be obtained.

Since the microwave fusion resin composition of the present invention according to claim 2 is constructed as described above, it is a polar composition in which conductive aniline polymer fine particles are finely dispersed in a thermoplastic resin. The property of the surface of the electrically conductive aniline-based polymer fine particles having high strength is extremely close to the property of the bonding surface of the thermoplastic resin molded product to be bonded, and the molded product for bonding obtained from the microwave fusion resin composition is When waves are applied and dielectric heating is performed, the melting temperature of the thermoplastic resin molding to be joined is raised uniformly and efficiently, and the thermoplastic resin molding to be joined is fused without deterioration of the thermoplastic resin due to partial overheating. To do. Furthermore, since the adhesion state at the interface between the thermoplastic resin and the conductive aniline-based polymer fine particles in the fusion-bonded portion of the thermoplastic resin molding is strong, more excellent fusion-bonding strength can be obtained.

Claims (2)

[Claims] 1. A thermoplastic resin of 100 parts by weight, conductive aniline polymer fine particles of 5 to 100 parts by weight, and a titanate coupling agent and / or an aluminum coupling agent of 0.01 to 20 parts by weight. A characteristic resin composition for microwave fusion. 2. A surface of a thermoplastic resin and 0.01 to 10 parts by weight of a titanate-based coupling agent and / or an aluminum-based coupling agent based on 100 parts by weight of conductive aniline-based polymer particles. A resin composition for microwave fusion, which comprises 5 to 100 parts by weight of conductive aniline-based polymer particles that have been treated.