JPS59161461A - Glass fiber-reinforced polyamide resin composition - Google Patents

Abstract

PURPOSE:To prepare the titled composition having remarkably improved impact strength and excellent surface smoothness and moldability, by compounding a polyamide resin with glass fibers and an alkyl amide of a benzenesulfonic acid derivative. CONSTITUTION:The objective composition is prepared by compounding (A) 86- 30wt% (preferably 60-40wt%) of a polyamide (preferably nylon 6) with (B) 10- 50wt% (preferably 30-50wt%) of glass fiber preferably having a length of 0.1- 10mm. and (C) 4-20wt% (preferably 7-15wt%) of an alkylamide of a benzenesulfonic acid derivative, preferably benzenesulfonic acid butylamide.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a polyamide resin composition reinforced with glass fibers and having excellent impact resistance, surface smoothness and moldability.

Traditionally, polyamide resins reinforced with glass fibers have excellent mechanical properties such as tensile strength and impact resistance, and heat resistance, so glass am is used as a high-performance material.
Products containing 45% by weight are used in large quantities for automobiles and general home appliances.

However, recently, materials with even higher impact resistance are required for automobile applications in order to withstand large external impact loads, and the materials used need to be improved in impact resistance.

Therefore, the inventors conducted extensive research with the aim of further improving the impact resistance of glass-reinforced polyamide, and found that by mixing polyamide resin with glass fiber and benoze/sulfonic acid derivative alkylamide, the impact strength was significantly increased. We have discovered that this can be improved and have arrived at the present invention.

That is, the present invention comprises 86 to 30% by weight of polyamide resin, 10 to 80% by weight of glass fiber, and benzenesulfono M.
A glass fiber-reinforced polyamide resin composition comprising 4 to 20% by weight of a derivative alkylamide is summarized below.

The polyamide resins used in the present invention include nylon 6, nylon/66, nylon/6/10. Aliphatic polyamide homopolymer or copolymer polyamide such as nylon 4/6,
Of these, nylon 6 is most preferred. These polyamide resins can be used even if they contain organic or inorganic substances such as flame retardants, pigments, and crystallization nucleating agents.

There are no particular restrictions on the shape of the glass fibers used in the present invention, and ordinary glass fiber-reinforced thermoplastic resins can be used. Glass fibers having a length of 01 to Ion are preferable in order to exhibit the desired mechanical strength in injection molding.

Examples of the alkylamides of benzenesulfonate derivatives used in the present invention include benzenesulfonebutyramide, N-ethyl-p-nitolue/sulponamide, 0- and p-toluene/ethylsulfonamide, N-cyclohexyl-
Examples include p-toluene sulfonamide. Particularly preferably, benzenesulfonobutyramide is used.

The composition of the present invention can be obtained by mixing a polyamide resin, glass fibers, pencenonulpolymer, and an alkylamide. For example, (1) a method in which polyamide resin, short fiber type glass fiber, and alkylamide of a benzenesulfonate derivative are melt-kneaded in an extruder and then cut into pellets; After extrusion mixing, the mixture is made into pellets and then injection molded, or extrusion molded.In the production of a composition for cedar, the alkylamides of these benzenesulfonic acid derivatives are mixed in a triblend and used as a molding material as is. However, the mixing method and addition method are not necessarily limited to these.

In the above mixing method, 86 to 30% by weight, preferably 60 to 4% by weight of the boria 2-do resin, based on the total weight of the above composition.
0% by weight, glass fiber 10-50% by weight, preferably 3
0 to 50% by weight and 4 to 20% by weight of the alkylamide of the benzenesulfonate derivative, preferably 7 to 15% by weight, but if the sulfonic acid amide derivative of mJ is less than 4% by weight. The above-mentioned improvement effect is not remarkable, and if it exceeds 20% by weight, the properties of the reinforced polyamide resin will be inhibited, the heat resistance will be lowered, the color tone will deteriorate, the mechanical properties will be deteriorated, and the stiffness will occur. do not have.

mJ Note (7) y, 11/ By mixing the ho/acid amide derivative and the glassy, Jdl fibers with the above polyamide resin, the composition of the polyamide resin and glass fibers is compared to a composition consisting of a mixture of only glass fibers and polyamide resin. The wetting properties are improved and the mechanical strength, especially the impact strength, is significantly improved, and the amount of bending per bend, which is unique for a glass fiber reinforced material, is increased, and it has excellent toughness and other mechanical strengths. It is possible to obtain a glass fiber-reinforced polyamide resin without deterioration.

The composition of the present invention thus obtained can be processed by injection molding, extrusion molding,
It can be applied to known molding methods such as blow molding.

The effects of the present invention will be explained in more detail below with reference to Examples.

The falling ball impact strength in each example was measured as follows.

(1) Determine the fracture energy when a 536 g steel ball is dropped from various heights onto a disc molded product with a falling ball impact strength of 100 Il#(1) x 3 and breaks at a frequency of 50%.

Example 1 45% by weight of nylon 6 resin treated with a nolano compound, 45% by weight of single short fiber glass fiber, and 10% by weight of benzenesulfonbutyramide were mixed well and molded using a single screw extruder. Get Perenote.

Next, this pellet is molded at a temperature of 26 (Ic) and an injection pressure of 65
Injection molding was performed using an injection molding machine 5J-35B manufactured by Kakaku Seisakusho at a mold temperature of 80 C and a mold temperature of 0 kQ/d to obtain a molded product for object measurement.

The results of measuring the mechanical strength of this molded article are shown below.

Tensile strength 1,6ooAg/cd Notch non-impact strength 1 18 kq * tx
/ CD falling ball impact strength 103 kti # C
M flexural modulus: 950 kg/am The same amount of glass fiber was mixed with nylon resin (55% by weight) without mixing the penzenosulfonic acid derivative alkylamide, and one sample was tested in the same way. The results are shown below.

Tensile strength 2.000 kti / d Knop non-impact strength 9 0 kg ・α / cd Falling weight impact strength 70 kti 61 Flexural modulus 1.20
0 kti/dAs is clear from the above comparison results,
The glass fiber reinforced polyamide resin composition of the present invention has significantly improved impact strength.

Example 2 p-) Physical properties were measured under exactly the same conditions as in Example 1 using one sample with the addition of lueno-ethylsulfonamide.

The result is as follows.

Tensile strength 1.420 kq / cd notch non-impact strength 11 6 ky α / ci Falling weight impact strength 95 kq-α Flexural modulus 950 kg @ mj Similar to the results of Example 1, the impact strengths are significantly different .

Example 3 2 to 25 parts by weight of penzenosulfonoptylamide were added to 100 parts by weight of a resin composition reinforced with 55% by weight of nylon 6 resin and 45% by weight of glass M fiber, and used in Example 1. Screw rotation speed 6 Or in the single molding machine Noritsuta
pm, after melting and mixing at a warp/taper temperature of 265°C,
Obtain test pieces for measuring physical properties.

The physical property measurement conditions are exactly the same as in Example 1.

As is clear from the result table, penzenosulfonphthyl 72
F cn ffx The impact strength is the same even though the tri-blend method is used. If the amount of one benzenesulfone butyramide added is less than 5%, the effect of improving impact strength is small.

Example 4 45% by weight of copolymerized nylon (6/66=90/10) resin, 45% by weight of glass fiber, and 10% by weight of benzenesulfone butyramide were mixed, and an extrusion molded product was injected in the same manner as in Example 1. 1 piece molded.

The physical properties were measured and the results are as follows: 〇Tensile strength
1.380 kg/cd□ Non-chip impact strength
1 28 kQ fist rs/c+1 falling weight impact strength 130 kg -ex bending modulus 830
kq / *j The physical properties of the same glass fiber-reinforced copolymerized nylon resin without benzenesulfone butyramide mixed therein are as follows.

Tensile strength 1.780 kq/cd notch non-impact strength 106 kq-cm/cd falling weight impact strength 110 mm/α Flexural modulus 1.250 mm/- Glass fiber reinforced copolymerized nylon resin also has the impact of the present invention A remarkable strength-to-strength effect is observed.

Patent applicant Higashi Shikikai Co., Ltd.

Claims (1)

[Claims] A glass fiber-reinforced polyamide resin composition comprising 86 to 30% by weight of polyamide, 10 to 50% by weight of glass fines, and 4 to 20% by weight of alkylamides of be/xenosulfonic acid derivatives.