JP2001072864A - Resin composition for vibration welding, and molding product - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a resin composition having excellent heat resistance, vibration welding property, etc., suitable for a hollow molding product such as an intake manifold of automobile by compounding a nylon resin with a bis unsaturated fatty acid ester of a specific polyalkylene glycol and a glass fiber in specific amounts, respectively. SOLUTION: This composition is obtained by compounding (A) 100 pts.wt. of a nylon resin (e.g. nylon 66, etc.), with (B) 0.1-30 pts.wt. of a bis unsaturated fatty acid ester of a polyalkylene glycol of the formula (R1 is a 6-40C unsaturated aliphatic hydrocarbon; n and m are each 0 or >=1; n+m is 5-100) and (C) 10-150 pts.wt. of a glass fiber. A bisoleic acid ester of polyethylene glycol, propylene glycol or polyethylene/propylene glycol copolymer is preferable as the component B. Preferably the composition is further compounded with 0.1-50 pts.wt. of a modified ethylene/α-olefin-based copolymer.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a welding resin composition which is excellent in heat resistance, surface appearance of a molded article, dimensional stability and vibration welding property, and furthermore, vibrates two or more melt molded articles. The present invention relates to a nylon resin composition suitable for a hollow molded article obtained by welding.

[0002]

2. Description of the Related Art Nylon resins are widely used in the fields of automobiles and mechanical parts, utilizing their excellent moldability, heat resistance, toughness, oil / gasoline resistance, abrasion resistance and the like. The development history of nylon resin in this field is basically a substitute for metal materials, and practical use has progressed from parts having many advantages such as weight reduction and rust prevention. More recently, with the development of high performance nylon molding materials and the development of molding technology, the application of nylon resin to parts that are large and have complicated shapes and are difficult to convert into resin with conventional technology has been studied. ing.

[0003] In order to convert such difficult parts into resin, it is not enough to use only a single molding technique such as injection molding, extrusion molding, blow molding or the like, and to combine post-processing techniques such as cutting, bonding and welding. Is required. However, the design of conventional nylon resin materials does not take into account the applicability to such post-processing. For example, a glass fiber reinforced nylon resin molded product consisting of two or more parts is subjected to vibration welding, injection welding, etc. In particular, when parts are large in size, the use is limited due to insufficient strength of the welded parts.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to improve the vibration weldability, which is a problem in the above-mentioned conventional nylon resin. In particular, there is a need for an improvement that stably develops a high weld strength even when the welding conditions during vibration welding change, thereby realizing an improvement in manufacturing stability. Another object is to obtain a nylon resin composition that is excellent in the inherent properties of nylon resin such as moldability, heat resistance, toughness, oil / gasoline resistance, wear resistance, surface smoothness of molded products, and suitable for vibration welding. I do.

[0005]

The present inventors have studied to solve the above-mentioned problems, and as a result, have found that a bisalkylene glycol fatty acid ester of a polyalkylene glycol having a specific structure is added to a glass fiber reinforced nylon resin. Have achieved the object, and have reached the present invention.

That is, the present invention relates to (1) (A) 100 parts by weight of a nylon resin, (B) 0.1 to 30 bis-unsaturated fatty acid ester of a polyalkylene glycol represented by the following general formula (1). Parts by weight, and (C) glass fiber 10
振動 150 parts by weight of a resin composition for vibration welding,

Embedded image (In the above formula, R ¹ represents an unsaturated aliphatic hydrocarbon group having 6 to 40 carbon atoms. N and m are 0 or a natural number of 1 or more and n + m = 5 to 100.) The vibration welding resin composition according to the above (1), wherein the addition amount of the polyalkylene glycol bis-unsaturated fatty acid ester of the component (B) is 0.1 to 10 parts by weight. (3) The component (B), wherein the polyunsaturated fatty acid ester of a polyalkylene glycol is polyethylene glycol,
The resin composition for vibration welding according to any one of (1) and (2), which is a bisoleic acid ester of polypropylene glycol or a polyethylene / propylene glycol copolymer.

(4) Any of the above (1) to (3), wherein the nylon resin of the component (A) is at least one selected from nylon 66, nylon 6, and copolymerized nylon containing these as a main component. The resin composition for vibration welding according to any one of (1) to (5), wherein the nylon resin of the component (A) is (a) at least one kind selected from nylon 66, nylon 6, and copolymerized nylon containing these as a main component. (1) to (1) to (5) containing 99 to 50% by weight of a nylon resin and (b) 1 to 50% by weight of at least one kind of nylon resin selected from higher nylon and semi-aromatic nylon other than the above (a). The resin composition for vibration welding according to any of 4), (6) 0.1 to 50 parts by weight of (D) the modified ethylene / α-olefin-based copolymer with respect to 100 parts by weight of the nylon resin. The By blending the above (1) to
(5) The resin composition for vibration welding according to any one of (1) to (5),
(7) The above-mentioned (1) to (6), wherein the change rate of the welding strength is within 10% with respect to a change of three times the pressing force at the time of vibration welding.
(8) A resin molded product comprising the vibration welding resin composition according to any one of the above (1) to (7), (9) The above (1) to (7). (7)
And a resin molded product obtained by vibration welding a resin molded product comprising the resin composition for vibration welding according to any one of the above.

[0008]

Embodiments of the present invention will be described below. In the present invention, “weight” means “mass”.

The (A) nylon resin used in the present invention is a polyamide containing amino acids, lactams or diamines and dicarboxylic acids as main components. Representative examples of the main components include 6-aminocaproic acid, 1
Amino acids such as 1-aminoundecanoic acid, 12-aminododecanoic acid and paraaminomethylbenzoic acid, lactams such as ε-caprolactam and ω-laurolactam, tetramethylenediamine, hexamethylenediamine, 2-methylpentamethylenediamine and nonamethylenediamine , Undecamethylenediamine, dodecamethylenediamine, 2,
2,4- / 2,4,4-trimethylhexamethylenediamine, 5-methylnonamethylenediamine, metaxylylenediamine, paraxylylenediamine, 1,3-bis (aminomethyl) cyclohexane, 1,4-bis ( Aminomethyl) cyclohexane, 1-amino-3-aminomethyl-3,5,5-trimethylcyclohexane, bis (4-aminocyclohexyl) methane, bis (3-methyl-4-aminocyclohexyl) methane, 2,2-bis Aliphatic, alicyclic, and aromatic diamines such as (4-aminocyclohexyl) propane, bis (aminopropyl) piperazine, and aminoethylpiperazine, and adipic acid, suberic acid, azelaic acid, sebacic acid, dodecanedioic acid, and terephthalic acid Acid, isophthalic acid, 2-chloroterephthalic acid, 2-methyltereic acid Aliphatic, alicyclic, aromatic dicarboxylic acids such as tallic acid, 5-methylisophthalic acid, 5-sodium sulfoisophthalic acid, hexahydroterephthalic acid, and hexahydroisophthalic acid are mentioned. The nylon homopolymers or copolymers derived from the raw materials can each be used alone or in the form of a mixture.

In the present invention, a particularly useful nylon resin is a nylon resin having a melting point of 200 ° C. or more and excellent in heat resistance and strength. Specific examples thereof include polycaproamide (nylon 6) and polyhexamethylene. Adipamide (nylon 66), polycaproamide / polyhexamethylene adipamide copolymer (nylon 6/66), polytetramethylene adipamide (nylon 46), polyhexamethylene sebacamide (nylon 610), polyhexa Methylene dodecamide (nylon 612), polyhexamethylene terephthalamide / polycaproamide copolymer (nylon 6T / 6), polyhexamethylene adipamide / polyhexamethylene terephthalamide copolymer (nylon 66 / 6T), polyhexamethylene adipa Mid /
Polyhexamethylene isophthalamide copolymer (nylon 66 / 6I), polyhexamethylene adipamide / polyhexamethylene terephthalamide / polyhexamethylene isophthalamide copolymer (nylon 66 / 6T /
6I), polyhexamethylene terephthalamide / polyhexamethylene isophthalamide copolymer (nylon 6
T / 6I), polyhexamethylene terephthalamide / polydodecaneamide copolymer (nylon 6T / 12),
Polyhexamethylene terephthalamide / poly (2-methylpentamethylene) terephthalamide copolymer (nylon 6T / M5T), polyxylylene adipamide (nylon XD6), polynonamethylene terephthalamide (nylon 9T) and mixtures or copolymers thereof Polymers.

Particularly preferred are hexamethyl terephthalamide units such as nylon 6, nylon 66, nylon 6/66 copolymer, nylon 610 and nylon 6T / 66 copolymer, nylon 6T / 6I copolymer and nylon 6T / 6 copolymer. It is also practically suitable to use these nylon resins as a mixture depending on the required properties such as moldability, heat resistance and welding properties.

When used as a mixture, (a) 99 to 50% by weight, preferably 98.5% by weight of at least one kind of nylon resin selected from nylon 66, nylon 6 and copolymerized nylon containing them as a main component. And (b) a nylon resin other than the above (a), for example, high-grade nylon such as nylon 610 and nylon 612 and nylon 6T / 6, nylon 6T / 12, nylon 6T / 66, nylon 66 / 6I. , Nylon 66
/ 6T / 6I, nylon 6T / 6I, nylon 6T / M
1 to 50% by weight of at least one kind of nylon resin selected from semi-aromatic nylons such as 5T, preferably 1.
It is preferable to use 5 to 30% by weight in terms of weldability. Although the degree of polymerization of these nylon resins is not particularly limited, they are usually prepared in a 1% 98% concentrated sulfuric acid solution at 25 ° C.
Is preferably in the range of 1.5 to 5.0, particularly preferably in the range of 2.0 to 4.0.

The compound used as the bis-unsaturated fatty acid ester of the polyalkylene glycol in the present invention is represented by the following general formula (1).

Embedded image In the above formula, R ¹ represents an unsaturated aliphatic hydrocarbon group having 6 to 40 carbon atoms. n and m are 0 or a natural number of 1 or more and n +
m = 5-100. n + m is preferably 5 to 50,
Particularly preferably, it is 10 to 30. Particularly preferred are polyethylene glycol, polypropylene glycol and bisoleic acid esters of ethylene glycol / propylene glycol copolymer, which are practically suitable.

The compounding amount of the (B) polyunsaturated fatty acid ester of polyalkylene glycol is 0.1 to 30 parts by weight of (B) the bisunsaturated fatty acid ester of polyalkylene glycol per 100 parts by weight of the polyamide resin. The range of parts is selected, and the range of 0.1 to 20 parts by weight is particularly preferable. If the addition amount is less than 0.1 part by weight, the vibration welding property of the obtained resin composition is insufficient, and if it exceeds 30 parts by weight, adverse effects such as volatilization during melt molding and a decrease in heat resistance become apparent. Therefore, it is not preferable.

The glass fiber used as the component (C) in the present invention is not particularly limited as long as it is used for general resin reinforcement. For example, it is selected from long fiber type, single fiber type chopped strand, milled fiber and the like. Can be used. The fiber diameter is not limited, but is 5 to 1.
Those having a range of 5 μm are preferably used. These glass fibers may be coated or converged with an ethylene / vinyl acetate copolymer or the like or a thermosetting resin.
Those treated with a titanate-based coupling agent or another surface treatment agent are particularly preferably used. The total glass fiber content in the resin composition of the present invention is 100% nylon resin.
10 to 150 parts by weight with respect to parts by weight;
A range of from -80 parts by weight is more preferred.

The modified ethylene / α-olefin copolymer used as the component (D) in the present invention is an ethylene / α-olefin copolymer modified with at least one compound selected from unsaturated carboxylic acid derivatives. The use of the thus-modified ethylene / α-olefin copolymer has a feature that the vibration welding strength is extremely improved even with a small amount of addition, which is one of the preferable embodiments.

The ethylene / α-olefin copolymer mentioned here is a copolymer of ethylene and at least one α-olefin having 3 to 20 carbon atoms, and the above-mentioned α / olefin having 3 to 20 carbon atoms is used. -As the olefin, specifically, propylene, 1-butene, 1-pentene, 1-hexene,
1-heptene, 1-octene, 1-nonene, 1-decene, 1-undecene, 1-dodecene, 1-tridecene,
1-tetradecene, 1-pentadecene, 1-hexadecene, 1-heptadecene, 1-octadecene, 1-nonadecene, 1-eicosene, 3-methyl-1-butene, 3-
Methyl-1-pentene, 3-ethyl-1-pentene, 4
-Methyl-1-pentene, 4-methyl-1-hexene,
4,4-dimethyl-1-hexene, 4,4-dimethyl-
1-pentene, 4-ethyl-1-hexene, 3-ethyl-1-hexene, 9-methyl-1-decene, 11-methyl-1-dodecene, 12-ethyl-1-tetradecene and combinations thereof. . Among these α-olefins, copolymers using α-olefins having 6 to 12 carbon atoms are preferable from the viewpoint of improving mechanical strength and further improving the reforming effect. The ethylene / α-olefin copolymer has an α-olefin content of preferably 1 to 30 mol%, more preferably 2 to 25 mol%, and still more preferably 3 to 20 mol%.

Furthermore, non-emulsions such as 1,4-hexadiene, dicyclopentadiene, 2,5-norbornadiene, 5-ethylidene norbornene, 5-ethyl-2,5-norbornadiene and 5- (1'-propenyl) -2-norbornene At least one of the conjugated dienes may be copolymerized.

In the present invention, examples of the compound selected from the unsaturated carboxylic acid derivatives (D) used as a modifier for the modified ethylene / α-olefin copolymer include acrylic acid, methacrylic acid, Maleic acid, fumaric acid, itaconic acid, crotonic acid, methylmaleic acid, methylfumaric acid, mesaconic acid, citraconic acid, glutaconic acid and metal salts of these carboxylic acids, methyl hydrogen maleate, methyl hydrogen itaconate, methyl acrylate, acrylic Ethyl acrylate, butyl acrylate, 2-ethylhexyl acrylate, hydroxyethyl acrylate, methyl methacrylate, 2-ethylhexyl methacrylate, hydroxyethyl methacrylate, aminoethyl methacrylate, dimethyl maleate, dimethyl itaconate, maleic anhydride, Anhydrous itacone , Citraconic anhydride, endobicyclo- (2,2,1) -5-heptene-2,3-dicarboxylic acid, endobicyclo- (2,2,1) -5-heptene-2,3-dicarboxylic anhydride , Maleimide, N-ethylmaleimide, N-butylmaleimide, N-phenylmaleimide, glycidyl acrylate, glycidyl methacrylate, glycidyl ethacrylate, glycidyl itaconate, glycidyl citraconic acid, and 5-norbornene-2,3-dicarboxylic acid It is. Among these,
Unsaturated dicarboxylic acids and their anhydrides are preferred,
Particularly, maleic acid or maleic anhydride is preferred.

These functional group-containing components are represented by ethylene / α-
The method for introducing the olefin copolymer is not particularly limited,
For example, copolymerization of a functional group-containing olefin compound with a tylene / α-olefin-based copolymer, which is a main component, or graft-introduction of a functional group-containing olefin compound to unmodified ethylene / α-olefin using a radical initiator. Can be used. The amount of the functional group-containing component to be introduced is preferably in the range of 0.001 to 40 mol%, more preferably 0.01 to 35 mol%, based on the entire olefin monomer in the modified ethylene / α-olefin copolymer. Something is appropriate.

The method for producing the ethylene / α-olefin copolymer used in the present invention is not particularly limited.
Any method such as radical polymerization, coordination polymerization using a Ziegler-Natta catalyst, anionic polymerization, and coordination polymerization using a metallocene catalyst can be used.

The compounding amount of the (D) modified ethylene / α-olefin copolymer is 0.1 to 100 parts by weight of (A) nylon resin and 0.1 to 0.1% of the modified ethylene / α-olefin copolymer. A range of 50 parts by weight is selected, preferably 0.1 to 30 parts by weight, particularly preferably 0.5 to 30 parts by weight. If the amount of the modified ethylene / α-olefin-based copolymer is less than 0.1 part by weight, the vibration welding property of the obtained resin composition is insufficient, and if it exceeds 50 parts by weight, the fluidity during melt molding is reduced. Therefore, it is difficult to achieve the intended purpose because adverse effects such as reduction in heat resistance and mechanical strength become apparent.

In the present invention, it is possible to add a copper compound as required. Specific examples of the copper compound include cuprous chloride, cupric chloride, cuprous bromide, and copper bromide. Cupric, cuprous iodide, cupric iodide, cupric sulfate, cupric nitrate, copper phosphate, cuprous acetate, cupric acetate, cupric salicylate, cupric stearate, Complex compounds of cupric benzoate and the above-mentioned inorganic copper halide with xylylenediamine, 2-mercaptobenzimidazole, benzimidazole and the like can be mentioned. Of these, monovalent copper compounds, particularly monovalent copper halide compounds, are preferred.
Copper and cuprous iodide can be exemplified as particularly suitable copper compounds.

The amount of the copper compound added is sufficient to improve the retention of the strength of the welded portion when the molded article of the resin composition to be formed is welded by vibration welding and then annealed. 0.01 for 100 parts by weight
To 3 parts by weight, preferably 0.015 to 2 parts by weight, particularly preferably 0.02 to 2 parts by weight.
If the addition amount of the copper compound is less than 0.01 parts by weight, the retention of the strength of the welded portion tends to be insufficient when annealing is performed after welding. Conversely, if it exceeds 3 parts by weight, metal copper is released during melt molding. And coloration reduces the value of the product.

In the present invention, it is possible to add an alkali halide in a form used in combination with a copper compound. Examples of the alkali halide compound include lithium chloride, lithium bromide, lithium iodide, potassium chloride, potassium bromide, potassium iodide, sodium bromide and sodium iodide, and the like. Sodium iodide is particularly preferred. Usually, it is preferably in the range of 0.01 to 5 parts by weight, more preferably 0.05 to 3 parts by weight, based on 100 parts by weight of the nylon resin.

In the present invention, it is also possible to add a fibrous / non-fibrous inorganic reinforcing material other than the above-mentioned specific glass fiber. Specific examples of the reinforcing agent include carbon fiber, potassium whisker, titanate, and the like. Zinc oxide whisker, aluminum borate whisker, aramid fiber, alumina fiber, silicon carbide fiber, ceramic fiber, asbestos fiber, stone fiber,
Fibrous fillers such as metal fibers, walasteinite, zeolite, sericite, kaolin, mica, clay, pyrophyllite, bentonite, asbestos, talc, silicates such as alumina silicate, alumina, silicon oxide, magnesium oxide, zirconium oxide Metal compounds such as titanium oxide and iron oxide; carbonates such as calcium carbonate, magnesium carbonate and dolomite; sulfates such as calcium sulfate and barium sulfate; hydroxides such as magnesium hydroxide, calcium hydroxide and aluminum hydroxide; Examples include non-fibrous fillers such as glass beads, ceramic beads, boron nitride, silicon carbide, and silica. These may be hollow, and two or more of these fillers may be used in combination. Further, it is more excellent to pre-treat and use these fibrous / non-fibrous fillers with coupling agents such as isocyanate compounds, organic silane compounds, organic titanate compounds, organic borane compounds and epoxy compounds. It is preferable from the viewpoint of obtaining high mechanical strength.

Further, the nylon resin composition of the present invention includes a nucleating agent such as talc, kaolin, an organic phosphorus compound, polyetheretherketone, a coloring inhibitor such as hypophosphite, a hindered phenol, a hindered amine and the like. Additives such as antioxidants, heat stabilizers, UV inhibitors, colorants, etc. can be added.

The method for preparing the nylon resin composition of the present invention is not limited to a specific method. As a specific and efficient example, a mixture of the raw material nylon resin and glass fiber is prepared by using a single-screw or twin-screw extruder, a Banbury. 220 to 330 depending on the melting point of the nylon resin used and supplied to a known melt kneader such as a mixer, a kneader and a mixing roll.
A method of melting and kneading at a temperature of ° C. can be used.

The nylon resin composition of the present invention thus obtained is excellent in heat resistance, surface appearance of the molded product, dimensional stability and vibration welding properties, and is excellent in injection molding, extrusion molding, It is particularly useful when a molded product obtained by blow molding is used by welding by a vibration welding method or the like. The vibration welding method referred to here is one of the methods of melting the contact surfaces of two or more resin molded products and bonding the melted surfaces together. For example, the joining surfaces of a plurality of molded products are bonded together. This is a method in which vibration is applied in the horizontal direction while being vertically pressed and welded by the generated frictional heat.

In particular, in the nylon resin composition of the present invention, the rate of change in welding strength can be kept within 15% with respect to a change in pressure three times during vibration welding, and even if the welding conditions change. Highly stable welded portions can be developed, and the production stability can be improved. From this point, the change rate of the welding strength with respect to a change of three times the pressure during vibration welding is within 10%,
It is preferably within 8%, particularly preferably within 5%.

The nylon resin composition of the present invention, which makes use of the above advantages, can be used for, for example, intake system components such as an intake manifold of an automobile, cooling system components such as a water inlet and a water outlet, fuel injection, and fuel delivery pipes. It can be suitably used for hollow parts such as fuel parts and containers such as oil tanks.

[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. In addition, the blending ratios shown in Examples and Comparative Examples are all parts by weight. In the following examples, evaluation of material strength, fluidity, and vibration welding strength was performed by the following method.

(1) Material strength Measured according to the following standard method. Tensile strength: ASTM D638 Flexural modulus: ASTM D790 (2) Fluidity Using a spiral flow measurement mold having a spiral shape with a width of 10 mm, a thickness of 2 mm, and a total length of 600 mm, use an injection molding temperature of nylon resin (a type with a large amount of compounding). ) Melting point + 20
℃, injection molding pressure 30 kgf / cm ² G, mold temperature 80
When the material was injection-molded under the condition of ° C., the distance flowing in the mold was measured and used as an index of fluidity. The longer the flow length, the better the fluidity.

(3) Vibration Weldability The shape of the test piece used for the evaluation of the welding strength is as shown in FIGS. The welding surface of the test piece shown in FIG.
A rib having a width of 1.5 mm and a height of 2.5 mm is provided. At the time of welding, the rib is melted and joined by friction. A test piece having the shape shown in FIG. 1 and FIG.
Welding was performed using a 0-type vibration welding apparatus under the following conditions. Frequency: 240 Hz ^{pressure: 100kgf (10kg / cm 2)} , or 300
kgf (30 kg / cm ² ) Amplitude: 1.5 mm Welding allowance: 1.5 mm FIG. 3 shows the shape of the hollow molded body obtained by welding.
The welding strength of each of the hollow molded body obtained by vibration welding at a pressure of 100 kgf and the hollow molded body obtained by vibration welding at a pressure of 300 kgf was measured by the following method. The hollow molded body is filled with water, an internal pressure is applied to the hollow molded body in a water tank, and the pressure at the time of the burst is defined as the welding strength. From the obtained welding strength, the welding strength change rate (change rate of the pressing force dependency) when the pressing force at the time of vibration welding is increased by three times is determined by the following equation. [Change rate of pressure dependency] = [| welding strength of 100 kgf welded product−welding strength of 300 kgf welded product | ÷ welding strength of 100 kgf welded product] × 100
(%) Further, the strength of the welded portion after treating the test piece welded at a pressure of 100 kgf in a heating oven at 150 ° C. for 10 hours was measured in the same manner as described above, and the strength retention was calculated.

In Examples and Comparative Examples, the following were used as the nylon resin, the bisunsaturated fatty acid ester of polyalkylene glycol, and the modified ethylene / α-olefin copolymer. <Nylon resin> (N6): Nylon 6 resin having a melting point of 225 ° C. and a relative viscosity of 2.70. (N66): Nylon 66 resin having a melting point of 265 ° C. and a relative viscosity of 2.90. (N6 / 66): Melting point of 217 ° C. Nylon 6/66 copolymer having a relative viscosity of 2.65, (N610): nylon 610 resin having a melting point of 225 ° C. and a relative viscosity of 2.70, and (6T / 12): nylon 6T having a melting point of 300 ° C. and a relative viscosity of 2.50. / 12 copolymer. <Bis unsaturated fatty acid ester of polyalkylene glycol> Bisoleic acid ester of polyethylene glycol (molecular weight 600). <Modified ethylene / α-olefin copolymer> 100 parts of ethylene / 1-butene copolymer, 1 part of maleic anhydride,
0.1 part of 2,5-dimethyl-2,5-di (tert-butylperoxy) hexane is mixed and melt-extruded at a cylinder temperature of 230 ° C. using a twin-screw extruder to obtain modified ethylene / 1-. Butene copolymer.

Examples 1 to 10, Comparative Examples 1 to 4 Nylon resin, bisunsaturated fatty acid ester of polyalkylene glycol, glass fiber (fiber diameter 13 μm), modified ethylene / α-olefin copolymer and copper compound Table 1
The mixture was mixed as shown in No. 3 and melt-kneaded at a cylinder temperature of 250 to 300 ° C. and a screw rotation speed of 150 rpm using a TEX30 type twin screw extruder manufactured by Nippon Steel Works. After drying the obtained pellets, various test pieces were prepared by injection molding (mold temperature: 80 ° C.). The results of measuring the fluidity, material strength, welding strength and the like of each sample were as shown in Tables 1 to 3. CuI of the copper compound used as the heat-resistant material represents cuprous iodide, and KI represents potassium iodide. The type of polyalkylene glycol used in the comparative example was (b-1) polyethylene glycol (molecular weight: 60
0), (b-2) polyethylene glycol (molecular weight 60
0) bisbenzoic acid ester. From the comparison between Examples 1 to 10 and Comparative Examples 1 to 4, the composition of the present invention is excellent in the balance between fluidity and material strength, particularly high in welding strength, and with respect to the change in pressure during vibration welding. It had a stable and high welding strength, and the strength of the welded portion after annealing was excellent and of high practical value.

[0037]

[Table 1]

[0038]

[Table 2]

[0039]

[Table 3]

[0040]

As described above, the nylon resin composition of the present invention has excellent heat resistance, fluidity, dimensional stability, and vibration welding properties, and is excellent in injection molding, extrusion molding, blow molding, and so on. It is particularly useful when the molded product obtained by molding is welded by a vibration welding method or the like, and taking advantage of this advantage, for example, an intake system component such as an automobile intake manifold, or a cooling system component such as a water inlet or a water outlet. It can be suitably used for fuel injection parts, fuel delivery parts such as fuel delivery pipes, and hollow parts such as containers such as oil tanks.

[Brief description of the drawings]

FIG. 1 is a view showing one shape of a test piece used for evaluation of welding strength in Examples, where A is a plan view, B is a front view, and C
Is a right side view and D is a bottom view.

FIG. 2 is a view showing another shape of a test piece used in the evaluation of the welding strength of the example, wherein A is a plan view, B is a front view, and C is a right side view.

FIG. 3 is a view showing the shape of a hollow molded body obtained by welding two test pieces (FIGS. 1 and 2) used in the evaluation of the welding strength in Examples, where A is a plan view and B is Is a front view,
C is a right side view.

[Explanation of symbols]

 1: rib a: welding surface

Claims (9)

[Claims] 1. A polyalkylene glycol bisunsaturated fatty acid ester represented by the following general formula (1): 0.1 to 30 parts by weight based on 100 parts by weight of a nylon resin (A).
Part by weight and 10 to 150 parts by weight of (C) glass fiber. Embedded image (Here, in the above formula, R ¹ represents an unsaturated aliphatic hydrocarbon group having 6 to 40 carbon atoms. N and m are natural numbers of 0 or 1 or more and n + m = 5 to 100.) 2. The amount of the bisunsaturated fatty acid ester of the polyalkylene glycol (B) to be added is 0.1 to 10%.
The resin composition for vibration welding according to claim 1, which is in parts by weight. 3. The polyunsaturated fatty acid ester of polyalkylene glycol as the component (B) is polyethylene glycol, polypropylene glycol or polyethylene / polyethylene glycol.
3. The resin composition for vibration welding according to claim 1, which is a bisoleic acid ester of a propylene glycol copolymer. 4. The nylon resin as the component (A) is at least one selected from the group consisting of nylon 66, nylon 6, and copolymerized nylon containing these as a main component. The resin composition for vibration welding according to any one of the above. 5. The method according to claim 1, wherein the nylon resin (A) comprises 99 to 50% by weight of at least one nylon resin selected from the group consisting of (a) nylon 66, nylon 6, and copolymerized nylon containing these as a main component. The vibration welding according to any one of claims 1 to 4, further comprising (b) 1 to 50% by weight of at least one kind of nylon resin selected from high-grade nylon and semi-aromatic nylon other than (a). Resin composition. 6. The composition according to claim 1, wherein 0.1 to 50 parts by weight of the modified ethylene / α-olefin copolymer (D) is further blended with respect to 100 parts by weight of the nylon resin (A).
The resin composition for vibration welding according to any one of the above. 7. The change rate of the welding strength is within 10% with respect to a change of three times the pressing force at the time of vibration welding.
The resin composition for vibration welding according to any one of the above. 8. A resin molded article comprising the resin composition for vibration welding according to claim 1. 9. A resin molded product obtained by vibration welding a resin molded product comprising the resin composition for vibration welding according to any one of claims 1 to 7.