JPS6198762A - Injection-molded article - Google Patents

Abstract

PURPOSE:A molded article having improved welding strength and ultrasonic welding strength, comprising an ethylene terephthalate polyester, a butylene glycol-containing polyester, a fibrous reinforcing material, and a powdery inorganic filler. CONSTITUTION:(A) 100 pts. wt. polyester having >=80 mol % repeating unit consisting of ethylene terephthalate is blended with (B) 5-80 pts. wt. fibrous reinforcing material, (D) 0.2-10 pts. wt. compound containing 2 or more epoxy groups,a nd (E) 0.01-5 pts. wt. powdery inorganic filler. A polyester having >=0.2 intrinsic viscosity in phenol/tetrachloroethane=6/4 is used as the compo nent B. Glass fibers are preferable as the component C. An alkylene polyol glycide ether is preferable as the component D.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to an injection molded product obtained from a polyester composition with improved moldability mainly consisting of lenterephthalate polyester 7, and which can be used in various applications. molded parts,
It can be widely used for sheet-like objects, tubular objects, laminates, containers, etc., but it has poor electrical resistance and heat resistance stability. Considering @Yukimi Parts, Automatic Parts 9, it can be effectively used for resistors, sockets, connectors, relays, fuse parts, motor parts, range parts, ICC parts, etc. In addition, due to its high tensile qJ degree, it is suitable for metal press-fitting, molded products with metal inserts, and molded products that undergo heat cycles. It is used for switch parts, sensor parts, flow control parts, etc.

[Conventional technology]

Polyethylene terephthalate has outstanding heat resistance, chemical resistance, mechanical properties, electrical properties, etc. ! It is used in many industrial products as fibers, fibers, and films.

However, when used as an injection molded product in plastic applications, polyethylene terephthalate has many disadvantages in molding due to its special crystallization behavior. That is,
Polyethylene terephthalate is originally formed as a crystalline 1R aggregate, but because it has a high secondary transition point, it is especially difficult to mold with general-purpose thermoplastic resin molding machines! 7 usually laughed at 10
When molding is performed at a skeleton temperature of 0° C. or lower, the shape stability of the molded product at temperatures above the secondary transition point becomes significantly poor. Not only does the residence time in the mold take a long time, resulting in poor mold releasability, but it also has drawbacks such as the occurrence of Vζ avatar-like or flowing patterns on the surface of the molded product. have. As the most effective technique to eliminate all of the drawbacks of cit et al., the crystallization initiation temperature of riboethylene terephthalate is shifted to the lower temperature side, and the crystallization rate is monitored. 8 parts by weight of a butylene terephthalate polyester, 5 to 5 ozy parts of a butylene terephthalate polyester, and 0.2 to 10 parts by weight of an epoxy compound having a polyoxyalkylene chain association. He was given β in the F Gongcho.

[Problems to be solved by EiA] When the above-mentioned conventional polyester composition was actually injection molded, strength problems occurred due to the shape of the molded product and the number of gates (90,000). When injection molded products are used as industrial parts, it is difficult to assemble them by ultrasonic welding.
In many cases, the strength of this welded portion may be so weak that it becomes a problem. These problems cannot be improved by using fibrous reinforcement materials.

[Problem 1 [Means to decide)] Therefore, the inventors solved the above problem? In order to solve the problem, as a result of intensive research and consideration, we finally came up with this invention? It has been completed. That is, the present invention provides polyester 100 in which 80 or more molar units of repeating units are ethylene terephthalate.
f, 50% butylene glycol as the glycol moiety
~100 mol% polyester 5 to 80 parts by weight, 6
ζζ-forming agent 15 = 180 parts by weight, 0.2 to 1 parts by weight of polyepoxide This is an injection molded product obtained by injection molding.

As a polyester whose unexploded bAvc > 80 molar force of the repeating unit is ethylene terephthalate,
Examples include not only polyethylene terephthalate but also copolymerized polyesters containing at least 80 moles or more, preferably ζ9υ moles or more of ethylene terephthalate repeating units. Copolymerization components include known acid components and /'1+
or glycol components can be used. That is, as a copolymerization component, for example, isophthalic acid, naphthalene 1,4-
or 2.6-dicarboxylic H, diphenyl ether 4.
Acid components such as 4'-dicarboxylic acid, adipic acid, and sebacic acid, propylene glycol, butylene glycol,
Examples include glycol components such as diethylene glycol, neopentyl glycol, cyclohexane dimetatool, and 2,2-bisC4-hydroxyphenylnopropane, and oxyacids such as p-oxybenzoic acid and p-hydroxyethoxybenzoic acid. In addition, polyester is a phenol/tetrachloroethane mixed solvent C6/4 weight ratio]
The intrinsic viscosity of the solution is usually 0.
It is 4 or more, preferably 0.5 or more, and particularly preferably 0655 or more. Of course, the above polyesters may be used in a combination of 2fi1 or more. Even a small amount of cross-linking component can be copolymerized to make a polyester.

(9) The polyester containing 50 to 100 moles of butylene glycol as the glycol component used in the present invention includes not only polybutylene terephthalate but also at least 80 moles or more, preferably 90 moles or more of butylene terephthalate repeating. Examples include co-1@r polyesters containing polyesters. Copolymerization components include aliphatic dicarboxylic acids, aromatic dicarboxylic acids, aliphatic glycols,
Aromatic diols, alicyclic diols, oxyacids, etc. are mentioned. The polyester has an intrinsic viscosity of usually 0.2 or more, which is determined by measuring in a phenol/tetrachloroethane mixed medium (6/4 ratio) bath solution at 30°C, and is preferably [), 5 or more, particularly preferably 0.7 to 1.3.

Examples of the fibrous reinforcing material to be incorporated into the molded article of the present invention include glass fibers, carbon fibers, graphite fibers, nitrogen carbon fibers, and quills, with glass fibers and carbon fibers being particularly preferred. Depending on the manufacturing method, various forms such as roving and chopped strands can be used. In addition, these fibrous reinforcing materials are treated with silane treatment, chromium treatment, epoxy treatment, etc. for the purpose of improving adhesion to plastics. It is preferable to apply it.

Next, as compounds having two or more epoxy groups, specifically, bisphenol diglycidyl ether, ethylene glycol cycliside ether, butanediol 1.4
diglyside ether, hexanediol 1.6 diglyside 7
Epoxy groups such as doether, neopentyl glycol diglycidyl ether, 1.4 dimeterol cyclohexane diglycidyl ether, etc.? Compounds with two or more epoxy groups, such as alkylene polyol glycide ether, glycerol polyglycidyl ether, epoxidized soybean oil, and trimethylolpropane polyglycidyl ether, are among the 1%. Alkylene polyol glycide ether.

Bisphenol diglycidyl ether is preferred.

Specifically, the powdered inorganic filler is y/l.

Wollastonite, clay, kaolin, silicate.

Examples include carbonates and sulfates of Group ⅠA of the Shusuke Table, with black being preferred.

Next, as the additive 7Jllt of each of the above formulations, firstly, to 100 parts by weight of ethylene terephthalate polyester, as a glycol component, all 5 butylene glycol was added.
Polyester containing 0 to 100% by weight is 5 to 80 parts by weight,
If it is less than 0.05 parts by weight, which is preferably 10 to 60 parts by weight, the strength is lowered by vc'J? If the amount exceeds 80 parts by weight, the solidification rate becomes slow and the moldability deteriorates, which is not preferable.

The fibrous reinforcement is 15 to 18 (1 part by weight, preferably 25
~120 parts by weight, further preferably 30 to 80 parts by weight''
There is 'r'. Outside the above range, the strength of the welded part or the sonic welded part and the conveying part collapses,
This is undesirable because it will not be possible to prevent the spread of dust.

Do compounds with two or more epoxy groups improve strength and form gels? 0.2 to 10 parts by weight, preferably 5L, preferably 0.5 to 8 parts, as long as it does not cause any damage.

It is added to the powdered inorganic filler as a nucleating agent in an amount so as not to impair the welding strength or ultrasonic welding strength, i.e., 0.01 part by weight or more and 5 parts by weight, preferably 0.01 to 1 part by weight.

Depending on the purpose of use, the composition used for this molded product may include:
It is preferable to include a polyester stabilizer, such as a polyester stabilizer, an ultraviolet absorber, and the like.

Especially when using ultrasonic bathing, is there any dimensional change after ultrasonic welding? Annealing treatment under lonely moxibustion conditions for the purpose of prevention? It is preferable to blend these ingredients because it allows the process to be carried out. Depending on the application, additives such as a conformability agent, a lubricant, a flame retardant, an antistatic agent, a colorant, a sliding injection improver, a blowing agent, and an impact strength improver may all be added. As a flame retardant, a halogenated compound (1M) or a compound of the ZVB group in the phosphorization periodic table, such as antimony trioxide, is used as a flame retardant aid. Particularly preferred flame retardants are:
US Patent No. 3833685 Specification Moss, JP-A-49-14
Carbonates such as halogenated bisphenols or their oligomers as disclosed in JP-A No. 563, % JP-A-52-15346, etc., JP-A-52-901
It is an oligomer obtained by reacting a halogenated cyanuric acid as disclosed in Japanese Patent No. 93 with a halogenated bisphenol and, optionally, a chlorinated alcohol or a monohydric alcohol.

There are no particular restrictions on the method for producing the polyester composition of the present invention, and any method may be used. For example, a method in which polyester and all other components are mixed in advance, and the mixture is supplied in an extrusion manner and melt-mixed; The molten material is put into a physical extruder, coated around the molten roving, cooled, and then cut into appropriate lengths after 7'C. Inorganic base filler? For example, after the polyester polymerization step or after pouring, the entire composition of the entire composition is mixed.

The method of molding the composition obtained as described above is in an injection molding machine in which the cylinder temperature is set at about 260 to 280°C. The molding process is performed using gold having an interfacial temperature of about 75 to 120°C. Note that any shape of injection molding machine, mold, etc. can be used.

[Effect]

It is not clear why the uninvented molded product has such good X-wire strength and ultrasonic welding strength, but the reason is that the butylene terephthalate polyester is uniformly dispersed in the ethylene terephthalate polyester, and the development of its spherulite structure is delayed. C to prevent,
Epoxy compounds improve the elongation of molded products. In addition, the image-shaped reinforcement prevents crack propagation, improves dimensional accuracy, and improves contact between welded surfaces.
Ru.

Furthermore, it is unexpected and surprising that the weld strength and ultrasonic welding strength are improved by reducing the total amount of the powdered inorganic optical filler to less than 5 parts by weight.

〔Example〕

The invention will now be explained by way of all embodiments. Note that in the examples, ``chi'' and ``part'' mean % by weight and 1 [mold part] unless otherwise specified.

Various evaluations of the NFC molded products obtained by molding the compositions in the examples were performed by the following method after heat treatment at 150° C. for 3 hours.

(11 Uyuld strength cylinder temperature adjusted to 260-270-270'C *
'gA'fc, an ASTM D638 test method type I test piece was molded using an injection molding machine using gold m (surface temperature 90°C) with side gates at both ends, and molded at 23°C under 50% RH.
Measured by tensile test at a deformation rate of nN/min.

(2) Ultrasonic welding strength The temperature of the cylinder was adjusted to 260-270-270°C. Using an injection molding machine, we made a 100 x 100 mm cylinder having an equilateral triangular cross-sectional length of 30 i + m with a side of 1.8 cm. 30
X 3.2nN test piece at mold temperature 90~10
A test piece was obtained by molding at 0°C.

5ONOPET 1200B Ultrasonic welding machine (Seidensha), pressure 31'P/7 Rooting time 0.3-182
In seconds, ultrasonic bath M bond, deformation speed 57111! / m
Evaluated by tensile shear strength at in.

(3) Anisotropy of maximum bending strain Similarly, a 100x100x3 flat sheet metal was formed with a film gate of the same thickness, and a test piece was cut in the flow n direction of this flat plate and in the transverse direction to this. All bending tests were conducted under the conditions of a span length of 50 mm and a deformation rate of 2 mm/min, and the anisotropy of the maximum bending strain rate was evaluated.

Examples 1-10. Comparative Examples 1 to 4 Polyester containing butylene glycol' (j511 to 100 mol %) as a glycol component in 100 parts by weight of polyethylene terephthalate, polyethylene glycol diglycidyl ether (molecular weight about 800) and glass fibers having a length of about 3 lengths were prepared as shown in Table 1. VC7C x FTK antioxidant in total of 0.6 parts by weight was added, and after pre-mixing, the mixture was charged into the hopper of a 40imp Event extruder and melted and mixed at a cylinder temperature of 250 to 275°C. A compound tip was obtained.This compound tip gold was heated at 130°C.
After drying under reduced pressure for 17 hours, the test piece was completely molded, and the anisotropy of weld strength, ultrasonic bath N strength, and maximum bending strain was evaluated. Each result is shown in Table 1.

It is clear from Table 1 that the molded product of the present invention 'fxL'51/c1 has high X-hard strength and ultrasonic welding strength, and that these decrease as a large amount of the powdered inorganic optical filler is blended.

〔Effect of the invention〕

The molded product of the present invention has high strength and ultrasonic welding strength, and its range of applications is greatly expanded.Furthermore, the molded product of the present invention can be assembled by ultrasonic welding, reducing assembly costs. It is great to contribute to a certain world.

Claims (1)

[Claims] 100 parts by weight of a polyester in which 80 mol% or more of repeating units are ethylene terephthalate, 5 to 80 parts by weight of a polyester containing 50 to 100 mol% of butylene glycol as a glycol component, 15 to 180 parts by weight of a fibrous reinforcing material, and an epoxy group. Compounds having 2 or more 0.2-10
An injection molded article obtained by injection molding a polyester composition blended with parts by weight and 0.01 parts by weight or more and less than 5 parts by weight of a powdered inorganic filler.