JPS5845465B2 - Polyamide materials - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an aluminum silicate-containing polyamide composition having good impact resistance.

Powdered inorganic oxides, carbonates, sulfates, silicates, etc. have long been used as fillers for thermosetting resins such as phenolic resins and epoxy resins, and have recently been used to save resources and reduce calories generated during combustion. It has been widely used as a filler for polyethylene resin and polypropylene resin for the purpose of

As for polyamide resins, many polyamide compositions containing such fillers have been proposed so far.

However, in polyamide compositions containing such fillers, impact strength (particularly falling weight impact strength) is significantly reduced, which has been considered a major problem in product design.

Polyamide compositions containing aluminum silicate are no exception to this and have the disadvantage of very low impact strength.

Furthermore, polyamide compositions containing calcined aluminum silicate have relatively high impact strength, but this is still not necessarily sufficient for practical use.

The present inventors have conducted intensive research to overcome the drawbacks of such aluminum silicate-containing polyamide compositions and to make them superior in impact resistance. It has been unexpectedly discovered that impact strength can be significantly increased when aluminum powder and surface-treated glass spheres are simultaneously blended in a specific ratio, and the present invention has been completed based on this finding.

That is, the present invention provides (4) glass spheres with an average particle diameter of 50 μm or less that have been surface-treated with an organosilicon compound;
B) Aluminum silicate or calcined aluminum silicate powder or a mixture thereof that has been surface-treated with an organosilicon compound at a weight ratio of A:B of 1:1 to 1.
:4, and the total amount of A and B is 30 to 60 of the total weight of the composition
The present invention provides an impact-resistant polyamide composition characterized in that the composition is blended with polyamide in such a proportion that the weight of the composition is excellent.

The polyamide composition of the present invention has much better impact resistance than a polyamide composition containing alone aluminum silicate surface-treated with an organosilicon compound or glass spheres surface-treated with an organosilicon compound. and
The effects of using both in combination are surprising.

In the present invention, one precept of the filler is an average particle size of 50
It is necessary to use glass bulbs with a diameter of 5 to 40 microns, preferably 5 to 40 microns.

When glass spheres having an average particle diameter exceeding 50 μm are used, no improvement in impact strength is observed.

The surface of the glass bulb must be treated in advance with an organosilicon compound, which is commonly called a silane coupling agent, such as γ-aminopropyltrimethoxysilane, γ-glycid Aminoalkyltrialkoxysilanes such as xyprobyltrimethoxysilane are used.

The aluminum silicate according to the present invention is a naturally occurring clay, a fired clay obtained by firing the same, and the surfaces thereof must also be treated with an organosilicon compound.

When aluminum silicate without surface treatment is used, the reinforcing effect is weak and is insufficient to achieve the object of the present invention.

The average particle size of this aluminum silicate is 0.1 to
A suitable value is 10μ, preferably 0.5 to 5μ.

It is necessary to use the above-mentioned A component and B component in such a ratio that the weight ratio of A:B is 1:1 to 1:4.

When the ratio of component B to component A exceeds this range, no improvement in impact strength is observed, and when it decreases below this range, mechanical strength and rigidity tend to decrease.

In the composition of the present invention, component A and component B need to be blended in such a way that the total amount thereof is 30 to 60 percent by weight of the total weight of the composition.

If this amount is less than 30 weight φ, no reinforcing effect will be observed, and if it exceeds 60 weight φ, it will become extremely brittle, which is not practical.

The polyamides used in the present invention include nylon 66, nylon 610, and nylon 612 obtained by condensation polymerization of diamine and dicarboxylic acid, nylon 6 obtained by ring-opening polymerization of lactam, and nylon 12 obtained by self-polymerization of ω-aminocarboxylic acid. These include nylon 7 and nylon 11 obtained by condensation, and copolymers and blends thereof.

In addition, in the polyamide composition of the present invention, calcium silicate,
It is also possible to contain fillers such as talc, mica, silica, calcium carbonate, and calcium sulfate, lubricants, dyes and pigments, and the like.

Examples of the present invention will be described below, but the present invention is not limited only to these examples.

Example 1 Nylon 66 resin 60% by weight, aluminum silicate 30% by weight with an average particle diameter of 1 μm surface treated with γ-aminopropyltrimethoxysilane, glass with an average particle diameter of 10 μm surface treated with γ-aminopropyltrimethoxysilane Ten weight balls were kneaded using a 40φ vented extruder and pelletized.

Using this pellet, 130
A flat molded product measuring 110 mm x 3 mm was molded.

Using this molded article, an impact test was conducted using a dart impact tester manufactured by Tester Sangyo Co., Ltd. (a drop impact tester manufactured according to ASTM D1709-62T) using a dart with a tip of 20R.

On the other hand, dumbbell test pieces and strip test pieces were molded using a 1-ounce injection molding machine and used for physical property measurements.

As a result, as shown in Table 1, it was confirmed that a product with high rigidity and high impact strength could be obtained.

Comparative Example 1 40 weight φ glass spheres having an average particle size of 10 μ and surface-treated with γ-aminopropyltrimethoxysilane and nylon 66 resin 60 weight were kneaded in a 40 φ vented extruder and pelletized.

It was molded in the same manner as in Example 1 and subjected to measurement of physical properties.

As shown in Table 1, the strength was not very high and the impact strength was only low.

Furthermore, instead of the glass bulb, a test was conducted using 40 weight cakes of aluminum silicate with an average particle size of 1 μm that had been surface-treated with γ-aminopropyltrimethoxysilane.

As shown in Table 1, only relatively high strength but relatively low impact strength was obtained.

Example 2 A test was carried out exactly as in Example 1, except that calcined aluminum silicate was used instead of aluminum silicate.

As a result, as shown in Table 2, products with extremely high impact strength were obtained.

Example 3 A test 11 was carried out in exactly the same manner as in Example 1, except that nylon 6 resin was used in place of the nylon 66 resin in Example 1.

As a result, as shown in Table 2, polyamide compositions with excellent performance were obtained.

Comparative Examples 2 to 7 Polyamide compositions as shown in Table 2 were manufactured and tested for physical properties.

As a result, both compositions have some performance deficiencies;
A polyamide composition with the desired performance was not obtained.

Example 4 Nylon 66 resin 60 parts by weight, aluminum silicate 20 parts by weight having an average particle diameter of 1 μm surface-treated with γ-aminopropyltrimethoxysilane, and average particle diameter 1.2 μm surface-treating with γ-aminopropyltrimethoxysilane. 10 parts by weight of calcined aluminum silicate and 10 parts by weight of glass spheres with an average particle diameter of 30 μm whose surface was treated with γ-aminopropyltrimethoxysilane were kneaded into pellets using a 40φ vented extruder, and molded in the same manner as in Example 1. The sample was then subjected to physical property measurements.

As a result, as shown in Table 3, polyamide compositions with excellent performance were obtained.

Claims (1)

[Claims] 1 (A) Glass spheres with an average particle size of 50 μm or less that have been surface-treated with an organosilicon compound, and (B) Aluminum silicate or calcined aluminum silicate powder that has been surface-treated with an organosilicon compound, or a mixture thereof. and are blended into the polyamide in such a proportion that the weight ratio of A:B is 1:1 to 1:4, and the total amount of A and B is 30 to 60% by weight of the total weight of the composition. impact-resistant polyamide composition.