JPS6037405A - Clamp - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a clamp for wiring and piping having hinge characteristics.

Conventionally, polypropylene resin has been widely used as a clamp material due to its excellent hinge properties, but polypropylene resin is not heat resistant in fields such as the automobile industry, where assembly processes involve high-temperature treatment processes of 200 to 230 degrees Celsius, such as during paint drying. It lacks functionality and is not used.

Materials for heat-resistant clamps are required to have heat resistance of 230°C or higher and maintain hinge properties even after high-temperature treatment in addition to heat resistance in normal conditions. Engineering plastics such as polyethylene terephthalate and polyphenylene sulfide are known, but most of these resins do not have sufficient hinge properties, especially after high-temperature treatment, and some resins with relatively good hinge properties are extremely susceptible to damage. It is worth it.

In addition to polypropylene resins, there are nylon resins such as nylon 6 and 12 which have excellent hinge properties, but these resins lack heat resistance.

Addition of plasticizers and rubber-like substances is generally known as a method of improving the flexibility and elongation of resins, and attempts have been made to add plasticizers and rubber-like substances to the above heat-resistant resins, but although the normal hinge properties are improved, after high-temperature treatment Satisfactory hinge properties have not been obtained due to volatilization of the plasticizer and deterioration of the resin.

As a result of intensive research into heat-resistant clamps that do not deteriorate hinge properties even after high-temperature treatment, the inventors of the present invention found that a polyamide containing a specific amount of nylon 6.11.12.6.10 or 6.12 resin was blended with nylon 66 resin. The present invention was achieved by discovering that the resin composition has excellent heat resistance at temperatures above 230° C. and excellent hinge properties not only in the normal state but also in the hinge properties after high-temperature treatment.

That is, in the present invention, 10 to 90 parts by weight of nylon 66 resin and 90 to 10 parts by weight of at least one type of nylon resin such as nylon 6.11.12.6.10 and 6.12 are added to a total of 100 parts by weight, and inorganic The present invention provides a clamp for wiring and piping having a hinge portion made of a polyamide resin composition containing 0 to 100 parts by weight of a filler.

The nylon resin used in the present invention preferably has a medium to high molecular weight because if the molecular weight is too low, the hinge properties will be insufficient.

The blending amount of these nylon resins is 10% of nylon 66 resin.
~90% by weight, preferably 20-80% by weight, nylon 6
．． 11.12.Nylon resin other than at least one type of nylon 66 resin of 6/10 and 6/12 is 90~
10% by weight, preferably 80 to 20 weight percent. If the content of nylon 66 resin is less than 10% by weight, the clamp of the molded product will melt or deform during high temperature treatment at 230°C, and if it exceeds 90% by weight, the hinge properties, especially the hinge properties after high temperature treatment, will be insufficient.

On the other hand, the inorganic filler is used for the purpose of improving mechanical strength, particularly structural stability during high-temperature processing, and non-fibrous fillers such as calcium carbonate, talc, kaolin, mica, etc. are preferable in order to suppress deterioration of hinge properties.

The amount of these inorganic fillers added is 1
0 to 100 parts by weight, preferably 0 to 100 parts by weight
It is 60 parts by weight. If it exceeds 100 parts by weight, the hinge properties will deteriorate.

Conventional methods can be used to blend multiple nylon resins and inorganic fillers, such as tri-blending multiple nylon resins and inorganic fillers and molding them as is, melt mixing in a drive l/nod edge extruder, and compression. Molding etc. can be applied. Furthermore, when adding an inorganic filler, use of a coupling agent improves dispersibility and adhesion with the nylon resin, and is effective in improving hinge properties, mechanical strength, and heat resistance.

The composition used in the clamp of the present invention may include heat-resistant stabilizers, weather-resistant stabilizers, plasticizers, lubricants, nucleating agents, pigments, dyes,
Flame retardants, foaming agents, etc. may be added as appropriate.

The shape of the clamp of the present invention, for example, as shown in Fig. 1, has a wiring or piping part (1), a fixing holding part (2) to a structure such as an automobile, a hinge part (3), and holding and fixing wiring, etc. It is equipped with fitting parts (4, 5) for the purpose of connecting, and always has a hinge part.

The clamp of the present invention has excellent heat resistance, hinge properties, especially hinge properties after high-temperature treatment, structural stability, and mechanical strength, and is particularly suitable for automobile-related fields where high-temperature painting is performed.

Next, Examples and Comparative Examples will be given.

51 Example 1 Nylon 66 resin (UBE Nylon 202 manufactured by Ube Industries)
6B) 55 parts by weight, nylon 6 resin (UB manufactured by Ube Industries)
Mix 45 parts by weight of E nylon 1022B) and 30 parts by weight of an inorganic filler (Satenton A5 manufactured by Hayashi Kasei ■),
Melt cross-wire granulation is performed using a 30-inch twin-screw extruder manufactured by Ikegu Iron Works.
A polyamide resin composition was obtained, which was molded into a clamp using an injection molding machine, and its heat resistance and hinge properties were measured. The results are shown in Table 1.

Example 2 An experiment was conducted under the same conditions as in Example 1 except that the mixing ratio of nylon 66 resin and nylon 6 resin was changed to 30 parts by weight of nylon 66 resin and 70 parts by weight of nylon 6 resin.

The results are shown in Table 1.

Example 3 An experiment was conducted under the same conditions as in Example 1, except that nylon 12 resin (UBE nylon 3024B, manufactured by Ube Industries, Ltd.) was used as the base of the nylon 6 resin in Example 1 in a 45-layered phase. The results are shown in Table 1.

6- Comparative Example 1 An experiment was conducted under the same conditions as in Example 1 using 80 parts by weight of nylon 66 resin, 20 parts by weight of a plasticizer for nylon (Valu BS manufactured by Marubishi Yuka ■), and 30 parts by weight of an inorganic filler. I did it. The results are shown in Table 1.

In Examples 1 to 3 and Comparative Example 1, the inorganic filler was surface-treated with a silane coupling agent.

The heat resistance test was conducted at 230°C for 30 minutes and at 240°C for 30 minutes to examine the presence or absence of melting and deformation, as well as the hinge characteristics after the treatment. The question is whether it can withstand the above bending.

Table 1 4 6 tsubo, 11 LaR

Claims (1)

[Claims] A clamp for wiring and piping having a hinge part characterized by 10 to 90 weight t of nylon 66 resin and 90 to 10 weight t of nylon resin other than nylon 66 resin.