JPH01190754A - Conductive polyamide resin composition - Google Patents

Abstract

PURPOSE:To obtain a polyamide resin composition made colorable and improved in conductivity and mechanical properties, by mixing a polyamide resin with at least one member selected from among the Group I and/or II metals of the periodic table and their salts. CONSTITUTION:100 pts.wt. polyamide resin (e.g., nylon 6 resin) is mixed with 0.01-15 pts.wt., preferably 1-5 pts.wt. at least one member selected from among the Group I and/or II metals of the periodic table and their salts (e.g., potassium thiocyanate).

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a colorable conductive polyamide resin composition which has a polyamide resin as a base and has excellent conductivity.

[Conventional technology]

The conventional conductive resin with excellent antistatic effect is IC-?
'It is used in carrier cases to protect LSIs, packaging materials for electronic components, etc.

The conductive resin used in this case is mostly a mixture of carbon blank and thermoplastic resin due to problems such as price, electrical properties, mechanical properties, and moldability.

However, although thermoplastic resin containing carbon blank has good conductivity, the resulting molded product has a black tone, making it unsuitable as a conductive resin material when color separation is required, and the aesthetics are poor. Currently, it cannot be used in areas where it is required.Also, there is a method of applying antistatic treatment to the surface of colored molded products, but the disadvantage is that the effect (conductivity) disappears in a short period of time. be.

For this reason, in recent years, various types of conductive resins that are blended with thermoplastic resins and water-soluble resins have been developed and studied as conductive resins that can be colored into desired colors.

However, the common drawbacks of products containing water-soluble resins are that the physical properties of the molded product (e.g., elongation, tensile strength) are significantly reduced, and the surface of the molded product tends to sag, causing lumps to be absorbed. There are disadvantages such as being easy to use.

[Problem that the invention seeks to solve]

The purpose of the present invention is to create a conductive polyamide resin composition that can be colored, which was not possible with conventional conductive resins, is easy to mold, and the resulting molded product has excellent mechanical properties. This is what we provide.

[Means to solve the problem]

In order to achieve the above object, the present invention adds [b1 Group 1 of the periodic table and/or
or one or two metals from group Ⅰ and their salts.
This is a conductive polyamide resin composition containing 0.01 to 15 parts by weight of at least one of the following.

The polyamide resin used in the present invention may be one obtained by repeating amide bonds and condensation polymerization, for example, nylon 12, nylon 11, nylon 6, nylon 6/6'.
, nylon elastomer, etc.

Examples of metals in Groups 1 and 2 of the periodic table include lithium, potassium, sodium, beryllium, calcium, magnesium, aluminum, etc., and metal salts in Groups 1 and 2 of the periodic table include halides and perchlorine. Examples include acid salts, perbromates, chlorates, bromates, thiocyanates, nitrates, sulfates, phosphates, fatty acid salts, etc. Specific compounds include potassium thiocyanate and sodium thiocyanate. , lithium thiocyanate, lithium sulfate, lithium stearate, lithium chloride, lithium perchlorate, etc.

In particular, the above-mentioned metal salts have a white color tone, so even after being blended into polyamide resin, they can be colored into various desired colors, and the mechanical properties and conductivity of the resulting molded products are also improved. It doesn't decrease at all.

In the present invention, (with respect to 100 parts by weight of the al polyamide resin, (b) one or more metals of Group 1 and/or Group Ⅰ of the periodic table and their salts is added in an amount of 0.01 to 15 parts by weight).
Add parts by weight. At this time, (the amount of bl component used is 0.
If the amount is less than 0.01 parts by weight, a sufficient conductive effect cannot be obtained, which is not preferable. However, even if more than 15 parts by weight of the BL component is added, the conductivity effect is not particularly improved, and the mechanical properties of the resin composition are rather deteriorated, which is not preferable.

In addition, it is particularly preferable (when the BL component is 1 to 5 parts by weight, the electrical properties and moldability are particularly well balanced).

There are no particular restrictions on the method for producing the conductive polyamide resin composition of the present invention, and it may be produced by generally blending various additives with polyamide resin.

Any dye or pigment used for coloring the composition of the present invention may be used as long as it has been conventionally used for coloring thermoplastic resins. For the purpose of easily dispersing the dye and pigment, fatty acids, fatty acid metal salts, low molecular weight polymers, fatty acid waxes, etc. may be added.

Furthermore, if desired, other additives such as antioxidants, photodegradation inhibitors, plasticizers (rose octyl henzene, N-butyl henzene sulfonamide, etc.) can be added at an appropriate time. .

Examples and comparative examples will be described below.

Example 1 100 parts by weight of powdered 6-nylon resin and 3 parts by weight of potassium thiocyanate were blended using a Henschel mixer, and then kneaded and extruded using a twin-screw presser to produce the conductive polyamide resin of the present invention. Pellets of the composition were obtained.

Next, using the pellet obtained above, a 100x150x2 test sample was produced using an injection molding machine.

Examples 2 to 8 and Comparative Examples 1 to 6 Examples 2 to 8 and Comparative Examples 1 to 6 were also prepared using the same manufacturing method as in Example 1, and the blending ratios (parts by weight) are shown in Table 1. Moreover, PVA used as an additive indicates polyvinyl alcohol.

Table 1 Next, the samples obtained in Examples 1 to 8 and Comparative Examples 1 to 6 are shown below.
D) was measured and the results are shown in Table 2.

(a) Volume resistivity value A 50 x 50 aluminum foil tape with a conductive adhesive made of baking soda is attached as an electrode to the front and back sides of a molded plate with a thickness of 2 mm, and the measurement is performed in an atmosphere at a temperature of 23° C. and a humidity of 53%.

■ Insulation resistance meter RC-02 manufactured by Kawaguchi Electric Seisakusho is used for measurement.

(+) Tensile strength and (c) Elongation Compliant with ASTM-D 638 (2) Appearance test of molded product The appearance of the specimen is visually judged, and at the same time, the degree of stickiness of the surface condition is judged using a tentacle.

The criteria are as follows.

◎・・・・・・The appearance and surface quality are very good.
・Appearance and surface quality are good ×...Poor appearance or stickiness occurs on the surface.

Table 2 [Effects of the Invention] Polyamide-based resins have polyamide bonds that exhibit polarity within their systems, and for this reason, when the (Al component and (BL component) are mixed together, the FBL component is easily dispersed. It is easy to do, especially [
When a polar metal salt such as potassium thiocyanate, sodium thiocyanate, lithium thiocyanate, lithium perchlorate, lithium chloride, lithium bromide, lithium stearate, lithium sulfate, etc. is blended as a BL component, it is extremely effective. An electrically conductive polyamide resin composition having a dispersed property is obtained.

The composition of the present invention obtained in this way exhibits a stable volume resistivity value in the range of 108 to 10I0Ω-■, and is pale white in color, so that it can be easily added with any coloring agent. , it can be colored to a desired color tone, and colorful molded products can be easily produced.

The volume resistivity value of the resulting molded product is almost the same as that without the addition of colorant.

In this way, the conductive polyamide resin composition of the present invention
Because it can be colored and has excellent conductivity, it can be used for antistatic parts such as IC magazines and IC trays, packaging and storage containers for semiconductor-related products, and products that require dust protection such as automobile interior parts and clean rooms. . Moreover, when producing the above-mentioned molded article, it can be colored in various desired colors, so the purposes of use are significantly increased compared to conventional molded articles using conductive resins containing carbon blanks.

For example, by using colored containers molded using the composition of the present invention and color-coded according to the purpose, the contents can be identified at a glance without opening the container.

Patent applicant: Tokyo Ink Co., Ltd.

Claims (1)

[Claims] (a) 100 parts by weight of polyamide resin, (b) 1 of the metals of Group I and/or Group II of the periodic table and their salts.
A conductive polyamide resin composition comprising 0.01 to 15 parts by weight of one or more species.