JPH0456863B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a high-impact transparent nylon resin composition that can be produced easily at low cost and has good moldability without impairing the excellent mechanical and chemical properties inherent to nylon. It is about things. Conventionally, transparent polyamides have been mainly produced by cocondensation polymerization of cyclic monomers and nylon monomers (see, for example, Japanese Patent Laid-Open No. 51-119794 and West German Publication No. 2743515), and they also maintain the excellent chemical resistance inherent to nylon. Because of this, common transparent resins (e.g., polymethyl methacrylate, polystyrene,
(acrylonitrile styrene resin, polycarbonate, etc.) are being used in fields where they cannot be used because they devitrify or crack with regular organic chemicals. However, the cost is high due to the use of special cyclic monomers, and the cyclic monomer segments in the copolymer have a high melting temperature.
There were also problems such as poor moldability of the obtained copolymer. Therefore, as a result of intensive efforts to solve the above-mentioned drawbacks, the present invention has been developed by combining a polyamide resin and specific additives, which is inexpensive and has good moldability, while still retaining the excellent chemical properties inherent to polyamide resin. It was discovered that high impact transparent nylon can be produced and the present invention was achieved. That is, in the present invention, 100 parts by weight of a polyamide resin having 14 or less amide groups per 100 carbon atoms,
1.0 parts by weight or more and less than 10.0 parts by weight of lithium halide, preferably 4.0 parts by weight or more and less than 10.0 parts by weight,
More preferably, a high impact transparent nylon resin composition containing 5.0 parts by weight or more and 10.0 parts by weight is provided. Conventionally, a composition in which lithium chloride is blended with polyamide is publicly known as seen in Japanese Patent Application Laid-open No. 56-61454, but this is a composition in which a small amount of lithium chloride is blended for the sole purpose of application as a heat-sensitive element. However, there is no mention of high impact resistance or transparency of the molded product. Also, Tokukai Akira
No. 57-185349 describes a composition in which lithium chloride is blended with polyε-caprolactam (nylon 6), but there is no mention of high impact strength or transparency here either. The polyamide resin used in the present invention is a polyamide with a low concentration of amide groups such as nylon 11, nylon 12, nylon 6/10, or nylon 6/12, and more specifically, a polyamide with a low carbon atom concentration.
Homopolyamide or copolyamide with 14 or less amide groups per 100 amide groups. Among the lithium halides that are additive components in the present invention, lithium fluoride, lithium iodide, lithium bromide, and the like are also effective, but lithium chloride is particularly effective. The amount of lithium halide used in the present invention is at least 1.0 parts by weight and less than 10.0 parts by weight, preferably at least 4.0 parts by weight and less than 10.0 parts by weight, and more preferably at least 5.0 parts by weight and less than 10.0 parts by weight. , sufficient transparency at 1.0 parts by weight or less;
High impact resistance cannot be obtained, and if it exceeds 10 parts by weight, the lithium halide itself will be dispersed as solid particles in the polyamide resin, resulting in a sharp drop in transparency, which is not preferable. The method of adding lithium chloride to the polyamide resin in the present invention is not particularly limited, but includes a method of immersing polyamide pellets or powder in an aqueous lithium chloride solution, a method of mixing lithium chloride and polyamide pellets or powder, and then melt-kneading the mixture using an extruder. Any method can be used, such as adding it at the stage of polyamide polymerization. The high-impact transparent nylon composition containing lithium halide of the present invention is put into practical use after being molded into an arbitrary shape by a method such as press molding, extrusion molding, or injection molding. The high impact transparent nylon compositions of the present invention may also contain conventional resin additives such as oxidative stabilizers,
Flame retardants, ultraviolet stabilizers, heat stabilizers, etc. may be added. The high-impact transparent nylon composition of the present invention thus obtained has extremely high impact resistance, very good transparency, good processability and mechanical properties, and very good resistance to organic chemicals. The effects of the present invention will be explained below with reference to Examples and Comparative Examples, but the present invention is not limited to these Examples. Example 1 Nylon 12 (Diamid manufactured by Daicel Hyulus)
To 100 parts by weight of lithium chloride (L1901), 3 parts by weight of lithium chloride (special grade manufactured by Hanui Chemical Co., Ltd.) was added, mixed using a Henschel mixer, melt-kneaded using an extruder, and then pelletized using a pelletizer. When a sheet with a thickness of about 0.5 mm was made from this pellet by press molding at 220°C, it had good transparency. In addition, test specimens were made by injection molding according to ASTM D256, and the Izod impact strength was measured, and the impact resistance was extremely excellent. The properties of this product are shown in Table 1. Example 2 Nylon 6/12 (D1700 manufactured by Daicel Hyulus)
When 5 parts by weight of lithium chloride was added to 100 parts by weight and a sheet with a thickness of about 0.5 mm was prepared in exactly the same manner as in the example, it had good transparency. Further, when the Izod impact strength was measured in exactly the same manner as in Example 1, the impact resistance was extremely excellent. The properties of this product are shown in Table 1. Example 3 Nylon 11 (Rilsan BESNO manufactured by ATO) 100
Adding 4 parts by weight of lithium chloride to the parts by weight,
When a sheet with a thickness of about 0.5 mm was prepared in exactly the same manner as in Example 1, it had good transparency. Further, when the Izod impact strength was measured in exactly the same manner as in Example 1, the impact resistance was extremely excellent. The properties of this product are shown in Table 1. Example 4 5 parts by weight of lithium chloride was added to 100 parts by weight of nylon 12 (L1840Y manufactured by Daicel Hyulus; containing a heat-resistant stabilizer), and a sheet with a thickness of approximately 0.5 mm was prepared in exactly the same manner as in Example 1. It had good transparency. Further, when the Izod impact strength was measured in exactly the same manner as in Example 1, the impact resistance was extremely excellent. The properties of this product are shown in Table 1. Comparative Example 1 A sheet with a thickness of about 0.5 mm and an Izod impact test piece were obtained in exactly the same manner as in Example 1 except that lithium chloride was not added. This material did not exhibit transparency and had low impact resistance. The properties of this product are shown in Table 1. Comparative Example 2 The same procedure as in Example 2 was made except that lithium chloride was not added in Example 3, and the thickness was approximately 0.5 mm.
sheets and Izod impact specimens were obtained. This material did not exhibit transparency and had low impact resistance. The properties of this product are shown in Table 1. Comparative Example 3 Comparative Example 1 except that the amount of lithium chloride added in Example 1 was changed from 5 parts by weight to 0.5 parts by weight.
A sheet with a thickness of about 0.5 mm was obtained in exactly the same manner as above.
This sheet had no transparency at all. The properties of this product are shown in Table 1. Comparative Example 4 A sheet was obtained in exactly the same manner as in Example 1 except that the amount of lithium chloride added was changed from 3 parts by weight to 12 parts by weight. The resulting sheet had small particles that appeared to be lithium chloride dispersed all over it. The properties of this product are shown in Table 1. Example 5 A sheet with a thickness of approximately 0.5 mm was prepared in the same manner as in Example 1, except that the amount of lithium chloride added was 7 parts by weight, and the sheet had good transparency. . Further, when the Izod impact strength was measured in exactly the same manner as in Example 1, the impact resistance was extremely excellent. The properties of this product are shown in Table 1. Example 6 A sheet with a thickness of approximately 0.5 mm was prepared in the same manner as in Example 1, except that the amount of lithium chloride added was 9 parts by weight, and the sheet had good transparency. . Further, when the Izod impact strength was measured in exactly the same manner as in Example 1, the impact resistance was extremely excellent. The properties of this product are shown in Table 1. 【table】

Claims (1)

[Claims] 1. A transparent nylon composition containing 1.0 parts by weight or more and less than 10.0 parts by weight of lithium halide in 100 parts by weight of a polyamide resin having 14 or less amide groups per 100 carbon atoms.