JPS6047061A - Reinforced polyamide resin composition - Google Patents

Abstract

PURPOSE:To improve mechanical properties and falling weight impact strength, by blending an inorg. mineral powder treated with an organosilane compd. contg. an ethylenically unsaturated bond and glass fiber with a polyamide. CONSTITUTION:At least 40wt% polyamide, 3-40wt% glass fiber and 5-50wt% inorg. mineral powder treated with an organosilane compd. contg. an ethylenically unsaturated bond are blended together, each quantity being based on that of the resulting compsn. As the polyamide, nylon 66 is preferred because of high toughness and heat resistance. As the inorg. powder, those having an average particle size of 2mu are preferred. Calcined kaolin obtd. by calcining kaolin clay at 350-1,000 deg.C for several hr and crushing it into a powder having an average particle size of 2mu or below, is particularly preferred. This reinforced polyamide resin compsn. is suitable for use in preparing automobile parts which require high reliability of plastic materials.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to polyamide resin compositions. More particularly, the present invention relates to reinforced polyamide resin compositions containing inorganic mineral powders having improved practical properties.

Polyamide resin has excellent mechanical and thermal properties and is widely used as a plastic molding material, but it is well known that glass fiber is blended with inorganic mineral powder into polyamide in order to further improve these properties.

In general, inorganic mineral powder does not exhibit its effect even if it is blended with plastic as it is. To deal with this, a so-called coupling agent is applied to the surface of the inorganic mineral powder, and the inorganic mineral powder and the organic plastic are bonded together. A method has been adopted in which the effect of blending is exerted by giving vc affinity between the two.

The coupling agent used at this time is different depending on the type of plastic depending on its function.
For polyamides, it has been customary to use aminosilane compounds. However, reinforced polyamide resin compositions containing inorganic mineral powder treated with an aminosilane compound and gas fibers are superior in mechanical properties such as tensile strength and flexural modulus, and warping deformability. However, its use was limited due to its poor falling weight impact strength.

As a result of intensive study to improve the above drawbacks, the inventors of the present invention found that
Surprisingly, it was discovered that an organosilane compound having an ethylenically unsaturated bond is particularly effective when blended with a polyamide together with an inorganic mineral powder treated with this compound and a glass fiber, which led to the present invention. That is, the present invention is a polyamide composition comprising polyamide, glass fiber, and inorganic mineral powder, wherein the amount of glass fiber in the polyamide composition is 3 to 40% by weight, and the amount of inorganic mineral powder is 5 to 50% by weight. The present invention relates to a reinforced polyamide resin composition characterized in that the amount of polyamide is 40% by weight or more, and the inorganic mineral powder is treated with an organic silane compound having an ethylenically unsaturated bond. Describe the composition.

The polyamide according to the present invention refers to nylon 66 and nylon 61O obtained by condensation polymerization of diamine and dicarboxylic acid.
, nylon 612, nylon 6 obtained by ring-opening polymerization of lactam, nylon 12, nylon 11 obtained by self-polycondensation of u-7 minocarboxylic acid, and copolymers thereof,
Blends, etc.

In particular, nylon 66 is preferred in terms of toughness and side heat resistance.

The glass fiber used in the present invention may be one that can be used as a reinforcing material for polyamide, and there are no particular limitations on the shape of the glass fiber. They can be of any shape, from long fiber types (glass roving) to short fiber types (chopped strands, milled fibers).

The inorganic mineral powder referred to in the present invention is a silicate compound such as calcined kaolin, kaolin, wollastonite, mica 1, or talc, and preferably has an average particle size of 10 μm or less, particularly about 2 μm. In addition, kaolin clay is 350 to 10
After calcination for several hours in the temperature range of 00℃, the average particle size is 2.
Particularly preferred is calcined kaolin that has been ground to less than μ.

Examples of the organic silane compound having an ethylenically unsaturated bond used in the present invention include vinyltriethoxysilane, vinyltris(β-methoxyethoxysilane, γ-methacryloxypropyltrimethoxysilane), and especially vinyltriethoxysilane. Silane is preferred.The blending ratio of the organic silane compound is 0 per 100 parts by weight of the inorganic mineral powder.
．． 05 to 5 layers, preferably 0.3 to 3 layers,
It is surrounded.

If the blending ratio of the organosilane compound is less than 0.05 part by weight, the physical properties of the molded article obtained using this composition will not be sufficiently improved, and even if it exceeds 5 parts, it is particularly preferable. It is not suitable because no effect is obtained and the physical properties of the molded product tend to deteriorate.

A known method is employed for surface treating the inorganic mineral powder with an organic compound having an ethylenically unsaturated bond.

For example, a method may be used in which a sufficient amount of inorganic mineral powder and an organic 7-run compound are directly charged into a Hensel mixer and mixed with high speed stirring.

The blending amount of the glass fiber used in the present invention is not more than a240 weight per total composition, preferably &;: S to 35 weight weight. When the amount of glass fiber blended is less than 3% by weight, the properties of the reinforced polyamide resin composition are not improved to the extent expected, and when it exceeds 40% by weight, the moldability of the composition is significantly reduced. .

The amount of inorganic mineral powder used in the present invention is 5 to 50% by weight, preferably 15 to 40% by weight based on the total composition.
It is. If the amount of inorganic mineral powder blended is less than 5% by weight, the blending effect will not be sufficient, and if it exceeds 50% by weight, melt mixing will be difficult and the moldability of the composition will be significantly reduced. Therefore, it is not practical.

The reinforced polyamide resin composition of the present invention is prepared by a conventional method for preparing polyamide resin compositions. For example, after premixing polyamide pellets, glass fibers, and organosilane-treated inorganic mineral powder, and feeding this into an extruder and melt-kneading, the reinforced composition of the present invention is produced without impairing its moldability or physical properties. Unless otherwise specified, other components such as pigments, dyes, side heating agents, oxidative deterioration inhibitors, lubricants, twisting agents, antistatic agents, mold release agents, plasticizers, other resin polymers, etc. may be added. can.

The reinforced polyamide resin composition of the present invention has improved mechanical properties such as tensile strength and flexural modulus, less deformation, and improved practical properties such as improved falling weight impact strength. It is particularly useful as a material for automobile parts that require strict reliability as a plastic material, such as cylinder rad covers, trunk axle rear covers, radiator tanks, and heater tanks.

The present invention will be explained in further detail with reference to Examples below. The physical properties of the test pieces described in Examples and Comparative Examples were measured according to the following method.

(1) Tensile test: ASTM D 63B (2) Bending test: ASTM D 790 (8) Heat distortion temperature: AS
TM D 648 (Drop weight impact test: J!S K72
xx (6) Sled deformation: Small flat plate (13
0x110x3) was used. The formed small flat plate was placed on a flat surface, local gaps caused by warping were observed, and the degree of the gap was evaluated as A, B, and C in descending order.

Example 1 Nylon 66, 60~ with a relative viscosity of 2.80, glass fiber (Asahi Fiberglass MA416) 10Kf and vinyltriethoxysilane (Shin-Etsu Silicon KBE 1003)
) Calcined kaolin surface treated with 6GOf (ENG
EL) Manufactured by IARD: ■5atintone Na
1) Pre-mix 30 kg with a bottle blender,
Then, using a 70φ single-screw extruder, the mixture was melt-mixed at 290° C. to obtain a pellet of reinforced polyamide resin composition. The obtained pellet was molded into a test piece for measuring physical properties at a temperature of 290° C. using an injection molding machine, and various physical properties were evaluated. The results are shown in Table 1.

Examples 2 to 3 Test pieces for measuring physical properties were molded in exactly the same manner as in Example 1, except that the proportions of nylon 66, glass fiber, and silane-treated calcined kaolin were changed as shown in Table 1, and various physical properties were evaluated. did. The results are shown in Table 1. - Comparative Examples 1 to 2 Test pieces for measuring physical properties were molded in the same manner as in Example 1, except that the proportions of nylon 66, glass fiber, and silica/treated m-form kaolin were changed to the proportions shown in Table 1. Physical properties were evaluated. The results are shown in Table 1.

Comparative Example 3 Instead of vinyltriethoxysilane, γ-aminoprobyltriethoxy7silane (manufactured by Fuyunika: A-1100) was used.
) was used to form a test piece for measuring physical properties in the same manner as in Example 1, and various physical properties were evaluated.

The results are shown in Table 1.

Comparative Example 4 Nylo 766.60Kf with a relative viscosity of 2.80 and vinyltriethoxysilane (Shin-Etsu Silicon S KBE 1003)
) 800g'' blush-treated calcined kaolin (ENG
ELI (ARD M:■5atintone NIL
1) A test piece for measuring physical properties was molded in exactly the same manner as in Example 1 except that 40 kg was used and no glass fiber was used, and various physical properties were evaluated. The results are shown in Table 1.

Comparative Example 5 r-aminopropyltriethoxysilane (manufactured by Nippon Unicar: A-1100) instead of vinyltriethoxysilane
A test piece for measuring physical properties was molded in the same manner as in Comparative Example 4 except that the following was used, and various physical properties were evaluated.

The results are shown in Table 1.

Margin below

Claims (1)

[Scope of Claims] L A polyamide resin composition comprising polyamide, glass fiber, and inorganic mineral powder, wherein the amount of glass fiber in the composition is 3 to 40% by weight, and the amount of inorganic mineral powder is 5 to 50% by weight.
% by weight, the amount of bonamide is 40% by weight or more, and the inorganic mineral powder is treated with an organic silane compound having an ethylenically unsaturated bond. Reinforced polyamide resin composition according to claim 1, which is calcined kaolin & Reinforced polyamide resin composition according to claim 1, wherein the reinforced polyamide resin composition is a material for automobile parts