JPS60246701A - Antistatic foamed polyurethane shoe sole - 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 antistatic foamed polyurethane shoe soles, and more particularly to:
This invention relates to antistatic foamed polyurethane shoe soles that do not contaminate floors or generate dust.

Antistatic shoes are widely used in factories, laboratories, etc.

The soles of shoes used in such places are designed in consideration of electrostatic shock caused by dynamic electricity and charging of the human body caused by static electricity.
It is designed to have an electrical resistance of 10' to 108 ohms. Conventionally, the soles of antistatic shoes have been rubber soles to which carbon blank is added, which can be easily designed to have an electrical resistance within the above-mentioned range.

However, rubber soles containing carbon black cannot be used in factories that manufacture integrated circuits, precision machinery, drugs, etc., assembly factories, laboratories, etc. because they contaminate floors and generate dust. There were drawbacks.

On the other hand, as a shoe sole material, foamed polyurethane is as widely used as rubber, and it does not pollute the floor or generate dust. Although it is suitable as a material for shoe soles, it has a high electrical resistance, making it difficult to design it within the range of 10 5 to 10 6 Ω.

The present invention was invented in view of these circumstances, and it provides conductivity to foamed polyurethane so that it has the desired electrical resistance, thereby preventing it from contaminating the floor or generating dust. The purpose of this invention is to provide a foamed polyurethane shoe sole that will not dry out.

The object of the present invention is to provide an antistatic foamed polyurethane shoe sole characterized in that 1 to 20 parts by weight of a quaternary ammonium salt or a non-electrolyte higher fatty nitrogen compound is added to 100 parts by weight of foamed polyurethane. This was achieved by offering.

Examples of the present invention will be described below.

First, the following liquid foamed polyurethane raw material is prepared.

Part A polyester polyol 100 parts by weight (butylene 7
1.4-butanediol 15 〃 Triethylene 7mine 0.5 〃 Silicone foam stabilizer 1 〃 White pigment 1 〃 Liquid B polyester polyol 100 Weight s (butylene acybate type, molecular weight approx. 2.500) Methylene diisocyanate] 40〃Quaternary ammonium salt and non-electrolyte higher fatty nitrogen compound are sequentially added to the above liquid A in varying amounts.1 However, this addition amount is the same as when mixing liquids A and B. 0.7, 1, 10, 20.23 parts by weight of quaternary ammonium salt and 0.7. L 1(i, 20.2
Each was added in an amount of 3 parts by weight, and the added liquid was converted into A'0+K O-7+Δ'1. A'
+o, A'go, A'zz, A'o, ? , A'+,
A”lo+A″′2゜ A′#2. It is abbreviated as

The thus obtained liquid A' or liquid A# and liquid B were mixed at a ratio of liquid A/liquid B - 106/100.
A 5 cm shoe sole mold was used to foam and harden to obtain a foamed polyurethane shoe sole.

The electrical resistance value of this foamed polyurethane shoe sole was measured according to the second test method of JIS T8103.

Electrical resistance (Ω) A'. Foamed polyurethane sole using 1.3X
1011A'0.7 6.7 x 109 A'+ 8.5 X 10'A'+o 5.7 X 106 A'201.6 x 105 A'23 1.1 X 109 Al”+ 4.7 x 107 A”+o 6.I X 106 Nto 8.8 X 105 A”z35.3 The foamed polyurethane shoe soles manufactured using this method have too high an electrical resistance and do not have antistatic properties.1, A'Z3, A''23
Foamed polyurethane shoe soles produced using this method have antistatic properties, but curing in the sole mold is significantly delayed and physical properties are impaired, making them impractical.

Therefore, in order to achieve the object of the present invention, the quaternary ammonium salt and the non-electrolytic higher aliphatic nitrogen compound should be
It was found that 0 part by weight was required.

Of the above, A'. Foamed polyurethane shoe soles made of the following materials were left standing in each of the atmospheres listed below, and changes in electrical resistance were examined.

Atmosphere conditions Atmosphere 1: Stand for 4 days at a temperature of 70°C and a humidity of 20X.

〃 2: After standing for 2 days at a temperature of 80°C and a humidity of 90X, for 3 days at a temperature of 40°C and a humidity of 2θχ 3: Soaked in Sesoken water (10001M solution) for 4 days, at a temperature of 40°C and a humidity of 2θχ Leave it inside for 3 days.

Electrical resistance after standing in each atmosphere Atmosphere 1 5.4 x 10Ω // 2 5.6 x 10'Ω // 3 B, 5 x 10'Ω According to the above results, polyurethane foam left standing in each atmosphere Although the sole of the shoe is slightly lower than that of a foamed polyurethane shoe sole (electrical resistance of 5.7 XIO') that has not been left in each atmosphere, it can be seen that this does not deviate from the purpose of the present invention.

In addition, A'+, A'IO, A'2G, A"1. A"
Shoes were manufactured using foamed polyurethane soles using A''20 and used in an integrated circuit manufacturing factory, but did not contaminate the floor or generate dust.

Patent applicant Tsukiboshi Kasei Co., Ltd.

Claims (1)

[Claims] An antistatic foamed polyurethane shoe sole, characterized in that 1 to 20 parts by weight of a quaternary ammonium salt or a non-electrolytic higher aliphatic nitrogen compound is added to 100 parts by weight of the foamed polyurethane.