KR960009932B1 - Polyamide resin composition having excellent transparence and slipping - Google Patents

Abstract

The polyamide resin is composed of 0.01-0.4wt% halogenated organic phosphoric ester as a antistatic agent, 0.1-5wt% octadecane amide as a slipping improvement agent, 0.01-0.1wt% talc with average particle size of 5 Pm as antiblocking agent and 0.01-0.5wt% calcium stearate as a lubricant against 100wt% polyamide resin with molecular weight more than 40000.

Description

Polyamide resin composition excellent in transparency and slipperiness

The present invention relates to a polyamide resin composition excellent in transparency and slip properties.

More specifically, the present invention relates to a polyamide resin composition suitable for producing a molded article such as a film having excellent surface properties, moldability, and particularly slip properties.

In general, a film formed of a polyamide resin composition is widely used for food packaging, various chemical packaging, or general packaging materials due to its toughness, gloss, solvent resistance, and high gas barrier properties.

However, in the film formed of polyamide, which is used for various packaging materials, the properties required in addition to the above properties are slip and transparency. A number of proposals have been made so far to improve the transparency and slip, but at the same time satisfy the slip and transparency. I could not make it.

That is, when enumerating the conventional radix for improving the transparency or slip properties of the film formed of polyamide, first, calcium carbonate, kaolinite, pentide, silica and the like are added to the polyamide resin in an appropriate amount to the film surface In this case, the slipperiness was improved, but in this case, a large number of fish eye (PCI) was formed in the film, and the transparency of the film itself was deteriorated because the added inorganic fine particles were formed in the same sphere as the crystal nucleus. there was.

Second, polyolefin resins lacking compatibility were added to the polyamide resin to improve transparency. However, the polyamide resin was insufficient to improve slipability, and the surface gloss was degraded.

Third, a method of improving the slipperiness of the film by adding ethylene bisamide derivative to the polyamide resin or improving the transparency by adding an organic zinc compound has been proposed, but these properties can be improved either of transparency or slipperiness. However, transparency and slip could not be satisfied at the same time.

In addition, the method of adding various organic compounds to the polyamide resin not only exhibits sufficient slip property, but also produces poor adhesiveness between layers when the film is produced in a multilayer, and also reduces the printability during film processing. There were many problems to be put to practical use.

The present invention has been made in an effort to provide a polyamide resin composition capable of simultaneously satisfying the above problems, that is, slippage and transparency of packaging films molded from polyamide resins. same.

That is, the present invention is 0.01 to 0.4 parts by weight of halogenated organic phosphate ester and 0.1 to 5.0 parts by weight of octadecane amide, talc of 0.01 to 0.1 parts by weight of an average particle diameter of 5 μm to 100 parts by weight of a high molecular weight polyamide resin having a molecular weight of 40,000 or more, calcium The present invention relates to a polyamide resin composition which can satisfy both slip and transparency formed by adding 0.01 to 0.5 parts by weight of stearate.

In the present invention, the purpose of employing a high molecular weight polyamide having a molecular weight of 40,000 or more is to prevent slippage and increase of fisheye when the film is manufactured. When the molecular weight of the polyamide is 40,000 or less, the slipability of the film is poor. Not only that, but the occurrence of PII may increase.

In the present invention, the purpose of adding the halogenated organophosphate ester is to impart a permanent antistatic effect and heat resistance. Specific examples thereof include tris (2,3-dichloropropyl) phosphate and tris (2-brom-3-chloropropyl ) Phosphate, tris (2-chloroethyl) phosphate, tris (2,4-dichlorophenyl) phosphate, tris (2,3-dibromine propyl) phosphate, tris (2-bromine ethyl) phosphate and the like.

The amount of polyamide added is preferably 0.01 to 0.4 parts by weight, and preferably 0.1 to 0.3 parts by weight.

If it is out of the above illustrated range, it is impossible to expect a permanent antistatic effect, a problem occurs that the heat resistance is lowered.

In addition, in the present invention, octadecane amide is added to improve the slip property of the film. The amount of addition is appropriately 0.1 to 0.5 parts by weight based on polyamide, and preferably 1.0 to 3.0 parts by weight is added without degrading transparency. The slip property can be improved.

In addition, it is preferable to use the talc added with an antiblocking agent whose average particle diameter is 5 micrometers, and the addition amount with respect to a polyamide is preferable 0.01 to 0.1 weight part.

If the added amount is 0.01 parts by weight or less, the antiblocking properties of the film is lowered, and when 0.1 parts by weight or more, the transparency of the film is lowered.

And it is suitable to achieve the object of the present invention that the magnesium component of the talc component is 15% by weight or less relative to the talc itself.

On the other hand, in the production of the film according to the polyamide composition of the present invention to improve the extrusion state from the extrusion die (Die) and to facilitate the desorption of the film to add calcium stearate as a lubricant component, the optimum for polyamide The amount of added is preferably 0.01 to 0.5 parts by weight.

Therefore, the present invention is 100 parts by weight of high molecular weight polyamide with a molecular weight of 40,000 or more 0.01 to 0.4 parts by weight of a halogenated phosphate ester as an antistatic agent, 0.1 to 5.0 parts by weight of octadecane amide as a slip improver and 0.001 to 0.1 parts by weight of talc as an antiblocking agent, By adding 0.01 to 0.5 parts by weight of calcium stearate as a lubricant, it is possible to express an effect of simultaneously improving the transparency and slipperiness of the polyamide film by the organic action of each other.

Embodiments illustrating the present invention in more detail are as follows.

Example 1-4 and Comparative Example 1-3

Nylon 6 pellets having a relative viscosity of 2.7, a diameter of 1.5 mm ø, and a length of 2 mm were obtained by a known melt polymerization method under normal pressure at 100 parts by weight of? -caprolactam.

The nylon 6 pellets were treated with water, and the yam was extracted, dried in a vacuum of 0.3 mmHg at 105 ° C., and then tris (2-chloroethyl) phosphate was added thereto for at least 8 hours under a nitrogen atmosphere of 150 ° C. After polymerization, pellets having a relative viscosity of 4.3 were obtained, and the pellets prepared by post-polymerization were mixed with octadecane amide, talc, and calcium stearate, and then melted at 250 ° C. A 400 mm film was produced.

TABLE 1

※ However, light transmittance is measured according to ASTM-D-1003 and slip property is measured according to ASTM-D-1894-63.

Claims (1)

0.01 to 0.4 parts by weight of halogenated organophosphate ester, 0.1 to 5.0 parts by weight of octadecaneamide, 0.01 to 0.1 parts by weight of talc having an average particle diameter of 5 μg and 0.01 to 0.5 parts by weight of calcium stearate, relative to 100 parts by weight of polyamide resin having a molecular weight of 40,000 or more. Polyamide resin composition excellent in transparency and slipperiness which were added.