JPS58109542A - Slide surface forming material - Google Patents

Abstract

PURPOSE:To provide the titled material showing an excellent effect of reducing the coefficient of friction for a long period of time, obtained by a method wherein a fine powder of a substance having a low slide friction resistance and a high wear resistance is coated with a silicon oil and the coated powder is mixed with a binder resin containing a silicon coupling agent. CONSTITUTION:A fine powder of a substance having a low slide friction resistance and a high wear resistance, such as Teflon, polyethylene, polypropylene, boron nitride or graphite, is prepared and the surface thereof is coated with a thin silicone oil film with a thickness of several molecules or less to increase the contact angle of the surface of the fine powder. In the next step, about 50-150pts.wt. treated fine powder is mixed with 100pts.wt. binder resin and a silicone coupling agent is compounded therein in order to enhance the bonding force of the fine powder and the binder resin to obtain an objective slide surface forming material. The obtained material is applied on the surface of a weather strip rubber to be suitably used in lowering the coefficient of friction.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sliding surface forming material. This is attached to a member that slides in contact with the surface of a rubber or plastic molded product and a glass surface or a metal surface in order to reduce the coefficient of sliding friction and facilitate sliding. In order to achieve this kind of objective, attempts have been made to attach a substance with a small coefficient of friction to the surface of a comb or plastic to make it easier to slide, but none of these methods were desirable. Among these, the most widely used method is to mix fine powder made of a substance with a small coefficient of friction with a suitable binding material such as synthetic resin.
This is a method in which this mixture is applied to a target part to form a sliding surface. This method has the advantage of good workability for forming sliding surfaces, but conventional products have the disadvantage of poor wear resistance and cannot withstand sliding friction, and the disadvantage that the effect of reducing the coefficient of friction is not sustainable. had. The first reason for this is that the adhesion between the fine powder made of a substance with a small coefficient of friction and the bonding material is poor, and repeated sliding causes the fine powder to fall off.

Second, the outer periphery of the fine powder is covered with the bonding material, and at the beginning of sliding, the bonding material with high frictional resistance comes into contact with the sliding surface of glass, metal, etc., and the sliding is repeated to a considerable extent. The point is that it becomes possible to reduce the frictional resistance only when the fine powder is exposed after the surface of the friction layer has been worn off due to heat generation. Thirdly, if the particle size of the fine powder is too small, the smoothness of the surface of the applied part increases, the contact area of the sliding surface increases, and it becomes susceptible to heat-generating wear due to friction.

The present invention relates to a material for forming a sliding surface that eliminates the above-mentioned drawbacks, forms a strong sliding surface with low frictional resistance, and can withstand long-term use. In the present invention, fine powder made of a substance with low frictional resistance is mixed into the binding material, but the feature is that a fine powder ring agent is used to improve the layering properties between the fine powder and the binding material. It is said that

The surface of a fine powder such as a substance with low sliding friction resistance and high wear resistance, such as Teflon, polyethylene, polypropylene, boron nitride, graphite, etc., whose coefficient of static friction against glass is 0.5 or less, is coated with a few molecules or less of silicone oil. coated with a thin film of powder to increase the contact angle on the surface of the fine powder. “This fine powder is mixed into a binding material such as polyisocyanate resin, acrylic resin, or epoxy resin. The mixing ratio must be determined - for example, 50 to 1
Mix fine powder within the range of 50 gills. Since the fine powder is coated with a thin film of silicone oil, it increases the contact angle on the surface, minimizes flaking by the binder resin, and allows the fine powder located in the upper layer to outcrop onto the binder resin surface. Furthermore, since silicone oil itself has lubricating properties, it can be expected to reduce frictional resistance from the initial stage of sliding.

However, minimizing the smearing between the fine powder and the binding material also reduces the bonding properties between the fine powder and the binding material, causing the fine powder to fall off.

Therefore, a silicone coupling agent is made to coexist in the binding material resin. The silicone coupling agent combines with the inorganic portion of the finely powdered silicone oil and the organic portion of the binder resin. If the thickness of the silicone oil film covering the surface of the fine powder is several molecules or less, strong adhesion between the fine powder and the binding material resin can be obtained due to the van der Waals force and the binding force of the coupling agent.

Examples Nylon paratar (average particle size 5 to 20μ) 225 parts by weight dimethylpolysiloxane 24 parts by weight Polyisocyanate resin 4.00” polyether polyol B□ //Silicone cutting agent 30//Ethylene glycol monoacetate
41//Ethyl ether triol 200 〃Manufacturing method Dimethylpolysiloxane (silicone oil) t-) Dissolved in liol to form a doluol solution of dimethylpolysiloxane (silicone oil), and mixed with this dissolved Rk nylon batter. Thereafter, the surface of the nylon balater is thinly coated with dimethylpolysiloxane (silicone oil) by allowing it to stand for at least 1 hour.

Cover with this silicone oil! Air dry the powder. Separately, polyether polyol, silicone coupling agent, and acetic acid ethylene glycol monoethyl ether are thoroughly mixed to form a mixed solution. The mixed nylon powder is mixed into this mixed solution before the silicone, and the mixture is thoroughly stirred. To use, add isocyanate to it, stir it, apply it to the surface of the watherstriff rubber base material using an air spray coating machine, etc.
Let dry for 0 minutes. When this weatherstrip rubber base material was tested using an abrasion resistance testing machine for the promotion of science, it showed performance of 10,000 times (load IKjE, 7ii' warm) or more in dry and wet tests. An automobile window frame was assembled using the above Weatherstritz rubber base material, and the upward and downward torque vibrations of the window glass elevating mechanism were measured.The upward torque was 2.2 K P -cm/se.
c, a value of 1.6 Ky-cm/sec in the downward direction was obtained, and a value of 3.2 KP-cm/sθC1 in the upward direction of the conventional product with flocking
Downward 2.4. A marked decrease in sliding resistance was observed compared to KP-cm/sec.

Claims (1)

[Claims] A fine powder made of a material with low sliding friction resistance and high wear resistance is coated with a film of silicone oil of several molecules or less, and this fine powder is mixed into a binding material resin in which a silicone cuffing agent is coexisting. A sliding surface forming material characterized by being formed by.