JPH10315333A - Polyamide resin vibration welding molding - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve strength, heat resistance and welding strength of a welding molding by vibration welding a plurality of moldings molded from polyamide resin composition obtained by mixing specific amount of glass fiber with polyimide resin made of specific amount of homopolyamide resin and copolyamide resin. SOLUTION: This molding is obtained by mixing 10 to 100 pts.wt. of glass fiber with 100 pts.wt. of polyamide resin containing 95 to 50 wt.% of homopolyamide resin and 5 to 50 wt.% of copolyamide resin. First, a plurality of components are molded, for example, by using the composition by an injection molding process. The plurality of the molded moldings are connected by vibration welding to obtain a polyamide resin vibration welded molding. A frequency of the vibration in the welding is 100 to 300 Hz, its amplitude is 0.5 to 2.0 mm, or preferably 0.8 to 1.6 mm. The welding pressure is 5 to 100 kg/cm<2> or preferably 10 to 60 kg/cm<2> .

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration-welded molded article made of a polyamide resin, and more particularly to a vibration-welded molded article of a polyamide resin obtained by joining a plurality of primary molded articles by vibration welding. Things.

[0002]

2. Description of the Related Art In recent years, applications of plastics have been expanded,
Taking advantage of this property, various industrial products, such as intake manifolds for automobile engines, have been converted into resins by the vibration welding method. As a material for resinification, glass fiber reinforced 66 nylon or glass fiber reinforced 6 nylon is used.

However, in the conventional method, even if the primary molded article is welded by the vibration welding method, a satisfactory welding strength cannot be obtained. For example, an automobile engine in which the vibration weld molded article is a hollow body molded article In the case of the intake manifold described above, sufficient pressure resistance cannot be obtained, and the intake manifold may be damaged when the internal pressure increases due to backfire of the engine or the like. For this reason, as a means for improving the welding strength, a method of increasing the relative viscosity of the polyamide resin to be used, a method of increasing the welding area, and the like are known, but in the former, a decrease in fluidity occurs, and in the latter, A design change was required.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to provide a vibration-welded molded article made of a polyamide resin which is excellent in strength, heat resistance, chemical resistance and welding strength.

[0005]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and the gist of the present invention is that a homopolyamide resin of 95 to 50% by weight and a copolyamide resin
Polyamide resin obtained by vibration-welding a plurality of molded products that are primarily molded using a polyamide resin composition obtained by mixing 10 to 100 parts by weight of glass fiber with respect to 100 parts by weight of a polyamide resin component of 50 to 50% by weight. Vibration welding molded products.

Hereinafter, the present invention will be described in detail. As a raw material serving as a structural unit in the homopolyamide resin and the copolyamide resin in the present invention, polymerizable ω-
Examples include amino acids or lactams thereof, preferably lactams having three or more ring members, or dibasic acids and diamines.

The ω-amino acids include ε-aminocaproic acid, 7-aminoheptanoic acid, 9-aminononanoic acid,
Examples thereof include 11-aminoundecanoic acid and 12-aminododecanoic acid. Lactams include ε-caprolactam, enantholactam, caprylactam, lauryl lactam, α-pyrrolidone and α-piperidone.

The dibasic acids include adipic acid, glutaric acid, pimelic acid, suberic acid, azelaic acid, sebacic acid, dimer acid, undecandionic acid, dodecadionic acid, hexadecadionic acid, hexadecenedionic acid, eicosandioic acid , Eicosadienedioic acid, diglycolic acid, 2,2,4-trimethyladipic acid, xylylenedicarboxylic acid, 1,4-cyclohexanedicarboxylic acid,
Terephthalic acid and isophthalic acid; Diamines include hexamethylenediamine, tetramethylenediamine, nonamethylenediamine, undecamethylenediamine, dodecamethylenediamine, 2,2,4 (or 2,4,4) -trimethylhexamethylenediamine, bis- (4, 4'-aminocyclohexyl) methane and meta-xylylenediamine.

The homopolyamide resin in the present invention includes 6 nylon, 66 nylon, and the like, preferably 6 nylon. The relative viscosity of the homopolyamide resin is a value measured at a concentration of 1% in 98% sulfuric acid and a temperature of 25 ° C. according to JIS K6810, and is preferably 2.0%.
４4.0. If the relative viscosity is less than 2.0, the welding strength will be low, and if it exceeds 4.0, the fluidity will be reduced. The relative viscosity of the homopolyamide resin is more preferably 2.
5 to 3.7.

[0010] The copolyamide resin in the present invention is preferably a crystalline copolyamide resin having a melting point of 180 ° C to 220 ° C or an amorphous copolyamide resin. When the copolyamide resin is a crystalline copolyamide resin, if the melting point is lower than 180 ° C., the solidification rate is reduced, and if the melting point exceeds 220 ° C., the welding strength is reduced.

The type of the copolyamide resin in the present invention is preferably 6/66 nylon, 6 / 6T nylon, 6I / 6T nylon, or the like, and more preferably has a melting point of 180 ° C. to 220 ° C. / 66 nylon, 6 / 6T nylon having a melting point of 180 ° C to 220 ° C, and amorphous 6I / 6T nylon. A plurality of copolyamide resins may be used.
Here, 6 / 6T nylon is a copolyamide resin whose constituent unit is a caprolactam unit and a polyamide-forming unit composed of terephthalic acid and hexamethylenediamine, and 6I / 6T nylon has a constituent unit of isophthalic acid and hexamethylenediamine. And a copolyamide resin which is a polyamide forming unit comprising terephthalic acid and hexamethylenediamine.

The relative viscosity of the copolyamide resin is determined according to JIS.
According to K6810 98% sulfuric acid concentration 1%, temperature 25 ° C
It is preferably 2.0 to 4.0.
If the relative viscosity is less than 2.0, the welding strength is reduced,
If it exceeds 4.0, the fluidity will decrease. The relative viscosity of the copolyamide resin is more preferably from 2.5 to 3.7.

The compounding amount of the copolyamide resin is 5 to 5 of the polyamide component of the homopolyamide resin and the copolyamide resin.
50% by weight. If the amount of the copolyamide resin is less than 5% by weight, the welding strength is reduced, and if it exceeds 50% by weight, the solidification rate is reduced. The compounding amount of the copolyamide resin is
Preferably, it is 7 to 40% by weight, more preferably 10 to 35% by weight of the polyamide component of the homopolyamide resin and the copolyamide resin.

The glass fibers in the present invention may be those usually used for thermoplastic resins, and preferably include chopped strands made of E glass (alkali-free glass). Fiber diameter of glass fiber is 1
To 20 μm, preferably 5 to 15 μm. As the glass fiber, a glass fiber that has been surface-treated with a silane coupling agent or the like to improve the adhesion to the polyamide resin is preferable.

The blending amount of the glass fiber is a polyamide resin component 10 consisting of a homopolyamide resin and a copolyamide resin.
It is 10 to 100 parts by weight with respect to 0 parts by weight. If the amount of the glass fiber is less than 10 parts by weight, the welding strength decreases, and if it exceeds 100 parts by weight, the fluidity decreases. The blending amount of the glass fiber is based on 100 parts by weight of a polyamide resin component composed of a homopolyamide resin and a copolyamide resin.
Preferably 15-80 parts by weight, more preferably 20-80 parts by weight.
70 parts by weight.

In the polyamide resin composition of the present invention, inorganic fillers other than glass fibers, such as glass flakes, glass beads, mica, talc, kaolin, wollastonite, and the like, as long as the effects of the present invention are not impaired.
A potassium titanate whisker or the like may be blended. Further, known additives such as a heat stabilizer such as a copper compound, a releasing agent, and a coloring agent such as carbon black may be blended. These blending is carried out at any stage from the polymerization of the resin to the molding, but it is preferable to carry out melt-kneading using an extruder.

In the vibration-welded molded article made of a polyamide resin of the present invention, a plurality of parts are firstly molded using a polyamide resin composition. As a molding method of a molded article obtained by primary molding, a molding method generally used in molding of a thermoplastic resin is applied, and preferably, an injection molding method is used. The plurality of molded products obtained by the primary molding in the present invention may have the same shape or different shapes from each other, for example, a molded product having a shape as shown in FIG. 1 or a hollow body as shown in FIG. A molded product having a shape shown in FIG. 3 in which a three-way tube is cut in a longitudinal direction is exemplified.

Next, the plurality of primary molded products are joined by vibration welding to obtain a polyamide resin vibration welded molded product. The frequency of vibration in vibration welding is 100 to 3
00 Hz, and the amplitude is 0.5 to 2.0 mm, preferably 0.8 to 1.6 mm. The welding pressure is 5
100 kg / cm ² , preferably 10 to 60 kg
/ Cm ² . If the welding pressure is too high or too low, the welding strength will decrease. The welding time, which should be under a predetermined pressure, is set so that the desired melting allowance is obtained,
The holding time after releasing the pressure is set so that the welded portion is sufficiently solidified.

Hereinafter, the present invention will be described in more detail with reference to examples. However, the present invention is not limited to the following examples unless it exceeds the gist of the present invention.

The polyamide resins used in the following examples and comparative examples are as follows.

(1) Homopolyamide resin-1: Nylon 6 (NOVAMID 1010J, relative viscosity 2.5, manufactured by Mitsubishi Engineering-Plastics Corporation) and Nylon 6 (NOVAMID 1020J, relative viscosity 3.
5. Mitsubishi Engineering Plastics Co., Ltd.)
6 nylon having a relative viscosity of 3.2. (2) Homopolyamide resin-2: 6 nylon (NOVA
MID 1010J, relative viscosity 2.5, manufactured by Mitsubishi Engineering-Plastics Corporation and 6 nylon (NO
6 nylon having a relative viscosity of 3.3 by mixing VAMID 1020J, relative viscosity 3.5, manufactured by Mitsubishi Engineering-Plastics Corporation.

(3) Copolyamide resin-1: 6/66 nylon (NOVAMID 2420J, melting point 193 ° C.,
(Mitsubishi Engineering Plastics Co., Ltd.) (4) Copolyamide resin-2: 6 / 6T nylon (NO
(VAMID 2620J, melting point 205 ° C, manufactured by Mitsubishi Engineering-Plastics Corporation) (5) Copolyamide resin-3: 6I / 6T nylon (N
(OVAMID X21S04, amorphous nylon, manufactured by Mitsubishi Engineering-Plastics Co., Ltd.) (6) Glass fiber: Trade name T249GH (manufactured by NEC Corporation)

The method for evaluating the vibration welding strength is as follows. (7) Test piece for measuring welding strength: Injection molding is performed under the conditions described in the examples described later to obtain two primary molded articles having the same shape as shown in FIG. Subsequently, vibration welding was performed under the conditions described in Examples described later to obtain a vibration welded molded product shown in FIG. (8) Measuring method of welding strength: This vibration-welded molded product is manufactured by Orientec Co., Ltd. using Tensilon UTM-III-50.
Using a 0-type testing machine, tension was applied under the conditions of a tensile speed of 5 mm / min and a distance between chucks of 80 mm, and the breaking strength at the welded portion was defined as the weld strength.

Examples 1-4 As shown in Table 1,
A homopolyamide resin, a copolyamide resin and glass fiber were blended. The composition is TEM manufactured by Toshiba Machine Co., Ltd.
The mixture was melt-kneaded at a set temperature of 280 ° C. using a −35B type twin-screw kneader. The obtained glass fiber reinforced polyamide resin composition was heated at a set temperature of 260 ° C. and a set mold temperature of 80 ° C. using an IS80EPN-2A type injection molding machine manufactured by Toshiba Machine Plastic Engineering Co., Ltd.
Two primary molded articles of the same shape were obtained.

Next, a pair of the primary molded products was used as a VIBRATION WELDER manufactured by Emerson Japan.
Using a Model 2800 vibration welding machine, the frequency was 240 Hz, the welding pressure was 15.5 kg / cm ² , and the amplitude was 1.5.
mm, welding margin 1.5 mm, Hold pressure: welding pressure 15.5 kg / cm ² after stopping vibration, holding time 5.0 sec, to obtain a vibration welded molded product shown in FIG. CX13 made by Emerson Nippon to control melting allowance
A type 2 non-contact WDC welding size control device was used. Table 1 shows the measurement results of the welding strength of the obtained vibration welding molded product.

Comparative Example 1 As shown in Table 1, a homopolyamide resin and glass fiber were blended. The mixture was melt-kneaded at a set temperature of 280 ° C. using a TEM-35B type twin-screw kneader manufactured by Toshiba Machine Co., Ltd. Using the obtained glass fiber reinforced polyamide resin composition, a primary molded product and a vibration weld molded product were obtained in the same manner as in Example 1. Table 1 shows the measurement results of the welding strength of the obtained vibration welding molded product.

[Comparative Examples 2-3] As shown in Table 1,
A homopolyamide resin, a copolyamide resin and glass fiber were blended. The composition is TEM manufactured by Toshiba Machine Co., Ltd.
The mixture was melt-kneaded at a set temperature of 280 ° C. using a −35B type twin-screw kneader. Using the obtained glass fiber reinforced polyamide resin composition, a primary molded product and a vibration weld molded product were obtained in the same manner as in Example 1. Table 1 shows the measurement results of the welding strength of the obtained vibration welding molded product.

[0027]

[Table 1]

[0028]

The vibration-welded molded article made of a polyamide resin of the present invention is excellent in strength, heat resistance, chemical resistance and remarkably excellent in welding strength, and is particularly effective for molded articles in various fields. It is useful for intake manifolds for automobiles that require high safety.

[Brief description of the drawings]

FIG. 1 shows the shape of a primary molded product (60 mm × 25 mm × 4 m
Explanatory diagram showing an example of m)

FIG. 2 is an explanatory view showing an example of the shape of a vibration welding molded product.

FIGS. 3A and 3B are plan views showing examples of shapes of a pair of hollow body molded products.

FIG. 4 is a conceptual diagram showing an example of a vibration-welded hollow body molded product.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Welding surface 2, 2 'Upper opening 3 Lower opening

────────────────────────────────────────────────── ─── Continued on the front page (51) Int.Cl. ⁶ Identification symbol FI B29L 22:00 23:00 (72) Inventor Tatsuya Hitomi 5-6-1 Higashi-Hachiman, Hiratsuka-shi, Kanagawa Mitsui Engineering Plastics Co., Ltd. Inside the company technology center

Claims (5)

[Claims] 1. A glass fiber of 10 to 100 parts by weight with respect to 100 parts by weight of a polyamide resin component comprising 95 to 50% by weight of a homopolyamide resin and 5 to 50% by weight of a copolyamide resin.
A vibration-welded molded article made of a polyamide resin obtained by vibration-welding a plurality of molded articles which are primarily molded using a polyamide resin composition containing parts by weight. 2. The vibration welded product made of a polyamide resin according to claim 1, wherein the homopolyamide resin is 6 nylon. 3. The copolyamide resin has a melting point of 180 ° C. or higher.
The vibration-welded molded article made of a polyamide resin according to claim 1 or 2, which is a crystalline copolyamide resin at 220 ° C or an amorphous copolyamide resin. 4. The copolyamide resin according to claim 1, wherein the copolyamide resin is one or more copolyamide resins selected from 6/66 nylon, 6 / 6T nylon and 6I / 6T nylon. Vibration welding molded product made of polyamide resin. 5. The vibration-welded molded article made of a polyamide resin according to claim 1, wherein the vibration-welded molded article made of a polyamide resin is a hollow body molded article.