JPS63212518A - Manufacture of sliding part - Google Patents

Abstract

PURPOSE:To prevent a line from a solution A tank bottom to a rotary valve and also a clearance between a shaft and a bearing surface from getting clogged by forming resin linings prepared through the process of heating omega-lactam molten substance solution A containing polymerization catalysts at the given temperature on the bearing surface. CONSTITUTION:With a shaft fitted into a bearing face and supported revolvably or reciprocatively, omega-lactam molten substance solution A containing polymerization catalysts for alkaline metal or alkali earth metal compound and omega-lactam molten substance solution B containing polymerization co-catalysts are injected into a clearance between said shaft and bearing surface and polymerically cured to form resin linings on the bearing surface and manufacture a sliding part for sliding the shaft on said linings. In that case, omega-lactam molten substance solution A containing polymerization catalysts is prepared through the process of being heated at the temperature of approximately 110 deg.C. By said process, the line is almost prevented from getting blocked because of the floatings in solution A, and the clogging at clearances between the shaft of the sliding part and the bearing surface is remarkably prevented from occurring and a good resin lining may be formed.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a method for manufacturing sliding parts, and more particularly to a method for manufacturing resin-lined sliding parts using a polyamide reaction injection molding method. It is.

(Prior art) In polyamide-based reaction injection molding, an ω-lactam melt (CAM) containing a polymerization catalyst and an ω-lactam melt containing a polymerization co-catalyst are used.
A molten lactam (liquid B) is simultaneously injected into a mold and reacted in the mold to form a molded product. Conventionally,
The above-mentioned liquid A is made by weighing the ω-lactam and the polymerization catalyst separately, and dissolving them under preset temperature and time conditions.
It was then prepared by cooling and solidifying, and was redissolved when reacting with liquid B.

(Problems to be Solved by the Invention) When manufacturing sliding parts lined with polyamide-based reaction injection molded resin by the above-mentioned conventional method,
In the polyamide reaction injection molding machine described in n# below, the pipe from the bottom of the A liquid tank to the rotary valve is not only blocked, but also becomes incapable of discharging.
When the shaft of a sliding part is fitted into a bearing and supported so that it can rotate or reciprocate freely, and when it is injected into the clearance between the shaft and the bearing surface, there is a drawback that A does not evenly spread over the clearance. Ta.

Figure 4 shows the system concept of the reaction injection molding machine. A liquid 21. into tanks 11, 22, and 24 respectively. B liquid 23. Pour in the cleaning liquid 25 and adjust the temperature inside each tank to about 9
The temperature inside the tank 11 is maintained at 0° C., and the inside of the tank 11 is stirred by an impeller 12. Next, when discharging, the plunger pump 13 and I
S' is activated, and with the rotary valve 14 in the state shown, liquid A 21 and liquid B 23 enter the plunger pump chambers 15 and 15' from the tanks 11 and 22, respectively. Next, move the rotary valve 14 in the opposite direction by 90 degrees.
``rotates, plunger pumps 15 and 13' operate,
AM21 and B liquid 23 pass through a pipe line 17 and reach a static mixer 18, where Ag21 and B liquid 2s are mixed and injected from a discharge port 19 into the clearance between the shaft and the bearing surface (not shown). Ru.

If a sliding part is manufactured using the above-mentioned warp injection molding machine according to the conventional method, the #1 passage 16 will be blocked approximately twice, resulting in the inability to eject, and even if the pipe line 16 is not blocked, , a problem arises in that the mixed liquid cannot be sufficiently injected into the clearance between the shaft and the bearing surface. In particular, the amount of A liquid discharged per time is 5.
When the amount is as small as %l or less, one or both of the above phenomena occur rapidly, significantly reducing productivity.

The reason why the above phenomenon frequently occurs is that the polymerization catalyst itself mixed with ω-lactam in liquid A, its decomposition products or oligomers, etc. are liberated and exist suspended in the ω-lactam solution. As a result, even though the tank 11 is constantly agitated by the impeller 12, a stationary state exists intermittently in the pipe line 16, causing the above-mentioned floating substances to gradually settle and adhere to the pipe wall, or to become attached to the shaft. The ninth problem is that it gets stuck in the clearance with the bearing surface. In the case of adhesion to the pipe wall, as this progresses, the adhered substance acts as an insulator against the heat transferred from outside the pipe, further reducing the pipe temperature.
This further promotes the adhesion of floating substances to the pipe walls.

The present invention is the ninth to solve the above-mentioned problems, and its purpose is to prevent the bottom of the liquid A tank from producing sliding parts lined with polyamide-based reaction injection molded resin. It is an object of the present invention to provide a method for preventing clogging of a pipe line leading from a rotary valve to a rotary valve, and also preventing clogging of a clearance between a shaft and a bearing surface.

(Means for Solving the Problems) In the method of manufacturing a sliding component of the present invention, an alkali is added to the clearance between the shaft and the bearing surface in a state where the mt shaft bearing is fitted and supported so as to be rotatable or reciprocating. ω- containing a polymerization catalyst of metal or alkaline earth metal compound
A lactam melt and an omega-lactam melt containing a polymerization promoter were injected and polymerized and cured to form a resin lining on the bearing surface, so that the curved shaft slid on the resin lining. In producing the sliding part, the sliding part is characterized in that it is prepared through a step of heating an omega-lactam melt containing the polymerization catalyst at a temperature of around 110C.

The present invention will be explained in detail below.

In the present invention, the ω-lactam is, for example, r-.

Butyrolactam, δ-valerolactam, ε-caprolactam, ω-enantholactam, ω-capryllactam,
These include ω-undecanolactam and ω-lauryllactam. These Φ may be used alone or as a mixture of two or more types.

The single catalyst dissolved in the ω-lactam is an alkali metal, an alkaline earth metal, or a compound thereof, which has been conventionally used for anionic polymerization of ω-lactam. Specifically, alkali metals, alkaline earth metals, hydrides thereof, alkyl compounds, aryl compounds, and in particular, reaction products of the above metals or metal compounds with ω-lactams,
Examples include sodium salt, potassium salt, magnesium halide salt, etc. of ω-lactam.

The amount of the polymerization catalyst used is preferably α01 to 20% by mole based on the ω-lactam. If cL0 is less than 1 mol %, the polymerization rate when reacted with liquid B is slow, and furthermore, polymerization may not occur due to the shadow 4 of a trace amount of water, and the value of industrial use is low.

Moreover, when it exceeds 20 mol%, the weather resistance of the final reaction injection molded product is reduced. Therefore, it is uneconomical unless a very high polymerization rate is required.

Afi is prepared by mixing the polymerization catalyst with the ω-lactam'm#a autumn product, raising the temperature to around 110°C, for example, 90°C to 130°C, and maintaining this temperature for 2 to 30 minutes to dissolve it. However, this step is one of the noteworthy points of the present invention. As mentioned above, the polymerization catalyst itself mixed with omega-lactam in liquid A, its decomposition products, or floating substances such as oligomers may cause blockage of pipes or clearance between the shaft and bearing surface in the reaction injection molding machine. This was causing the blockage. In the present invention, the solution of liquid A is 1
By raising the temperature to around 10°C, particularly in the range of 90°C to 0°C, and maintaining this temperature for 2 hours to 30 minutes, the above-mentioned suspended matter was well dissolved in the ω-lactam melt. ing. It is best to keep the temperature within this range longer on the low temperature side and shorter on the high temperature side. For this reason,
A small amount of suspended matter is deposited, and pipe blockage is significantly delayed.
Clogging of the clearance between the shaft and the bearing surface is also significantly reduced.

14# of B liquid of the present invention! The polymerization promoter used for ω
- All compounds conventionally used in polymerizing lactams by the anion-one method can be used. Specific examples thereof include isocyanates such as toluene diisocyanate, 4,4'-diphenylmethane diisocyanate, hexamethylene diisocyanate, polymethylene polyphenyl polyisocyanate, diisocyanate modified with carbodiimide, and hexamethylene-1,6-biscarbamide. Caprolactam, N, N'-
Carbamide lactams such as diphenyl-p-phenylenebiscarbamide caprolactam, N,N'-diphenyl-p-7enylenebiscarpamide pyrrolide, acid halides such as terephthalic acid chloride, adipic acid chloride, sebacic acid chloride, adipic acid chloride, etc. Polyacyl lactams such as polybiscaprolactam, adipoylbispyrrolidone, terephthaloylbiscaprolactam, terephthaloylbispyrrolidone, isophthaloylbiscaprolactam, or the formula ``in the formula ``, where ``human'' represents a halogen atom, ), a is ffl of 1, 2 or 3,
b is two or more pot ridges, Rs represents an alkyl group, an aralkyl group, an alkyloxy group, an aryloxy group, a halogen group or an aralkyloxy group,
Karasu represents a divalent or higher group selected from a hydrocarbon group and a hydrocarbon having an ether bond, and 2 represents (1) a polyether having a minimum molecular weight of about 2000, (2) a polyether segment having a minimum molecular weight of about 2000. gold-containing polyester segment, or (3) minimum molecular weight 1
000 represents a hydrocarbon. is an acid halide monofunctional substance or a lactam functional substance selected from the group consisting of compounds represented by:

In the present invention, the above-mentioned liquids A and B are injected into the clearance between the shaft and the bearing surface using a reaction injection molding machine or the like, after a shaft is fitted into a bearing and supported so as to be rotatable or reciprocating. 1
forming a resin lining on the bearing surface by combining and curing;
A sliding part convex metal is manufactured so that the shaft slides on the resin lining.

(Function) The present invention delays pipe blockage at the bottom of the liquid A tank in polyamide reaction injection molding for manufacturing sliding parts lined with polyamide reaction injection molding material, and the shaft where the material is injected. Significantly reduces clogging of the clearance with the bearing surface.

(Examples) Next, the present invention will be described in more detail based on Examples, but the present invention is not limited thereto.

Embodiment 1 In FIGS. 1 and 2, 1 indicates the outer spline bearing, 2 indicates the shaft of the inner spline that fits into the bearing 1 and is supported freely in the forward direction, and 3 indicates the shaft on the bearing 0k14 of the bearing 1. The resin lining, 5 and 6, is formed by reaction injection molding of polyamide thread, and is the center for 6 exits.

This 5! For the sliding parts of this example, first, a mold release agent is applied to the bearing surface 4 of the bearing 1, and a brimer is applied to the coating surface of the shaft 2. Next, the bearing 1 and the bearing 2 are preheated to 140°C and treated with A liquid and Prepared for injection of B solution.

After mixing 94.5 parts by weight of C-caprolactam and 5.5 parts by weight of bromomagnesium caprolactam, the mixture was heated to 110°C, kept around this temperature for 1 hour, cooled to below 90°C, and solidified by cooling to obtain 14g of B. Liquid A, 55.5 parts by weight of ε-caprolactam, and a polymerization cocatalyst represented by the following formula (17 (where 2 in the formula represents a block copolymer of ethylene oxide and propylene oxide having a molecular weight of about 6000) 44. B liquid consisting of 5 weight s was prepared vI4.These AtL and B liquid were placed in the tank 11 of the reaction injection molding machine shown in FIG.
Add liquid B 23 to. These tanks are maintained at 90° C. by a temperature controller 20.

Next, the plunger pumps 15 and 15' are operated so that the weight ratio of liquid A 21 and liquid B 23 is 1:1, and both liquids are introduced into the static mixer 18 and mixed, and this mixture is passed through the discharge port 19 as described above. Pour an appropriate amount into bearing 1, then @2
was fitted into the bearing 1, so that the mixture was uniformly spread over the clearance between the shaft 2 and the bearing surface 4 with a thickness t of about 22 mm, and the mixture was held at 140° C. for 5 minutes.

In the obtained sliding part, the resin lining 5 was formed over the entire clearance between @2 and the bearing 14, and the shaft 2 did not shake at all.

Furthermore, using liquids A and B having the above compositions, the period of time until the pipe line 16 from the bottom of the tank 11 to the rotary valve 14 for continuous use of the reaction injection molding machine is blocked and discharging becomes impossible is 4. It was a month.

Comparative Example I ε-caprolactam as liquid A? 4.5 heavy it 8
A Suri IIeJ part was formed in the same manner as in Example 1, except that 112 was prepared by mixing 1 tobromomagnesium and 5.5 parts by weight of prolactam.

In the sliding S product, which had been modified, the clearance between the shaft and the bearing surface was clogged, the resin lining was not formed on the entire surface of the clearance, and the shaft rattled.

Furthermore, in this case, it took two weeks until the reaction injection molding machine became unable to eject due to blockage of the pipe line.

Embodiment 2 FIG. 5 shows another sliding S product, including a bearing 7, a shaft 8 fitted therein and rotatably supported, and a bearing surface 10 of the bearing 7 of the same type as used in Embodiment 1. Resin lining 9 (
The average thickness is 15 am).

In this sliding part, a resin lining 9 was formed over the entire clearance between the shaft 8 and the bearing surface 10, and @8 had no rattling and was capable of smooth rotational movement.

(Effects of the Invention) According to the method of manufacturing the sliding wb portion of the present invention, the snowy road is not blocked due to the suspended matter of liquid A, and the clearance between the shaft of the sliding part and the bearing surface is significantly clogged. A beautiful resin lining is formed. For these reasons, the present invention improves the productivity of sliding parts, and its industrial utility value is extremely large.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing a sliding part according to one embodiment of the present invention, FIG. 2 is a plan view of FIG. 1, and FIG. 3 is a sliding #IJ component according to another embodiment of the present invention. FIG. 4 is a conceptual system diagram of a reaction injection molding machine. In the diagram, 1.7... Bearing 2.8... 3.9
... A4 fat lining 4.10 ... Bearing surface patent applicant Mitsubishi Sensanto Kasei Shiki Co., Ltd. Fig. 1 Fig. 23 Fig. 4

Claims (1)

[Claims] When the shaft is fitted into a bearing and supported so that it can rotate or reciprocate, the clearance between the shaft and the bearing surface contains an ω-containing polymerization catalyst of an alkali metal or alkaline earth metal compound.
A lactam melt and an omega-lactam melt containing a polymerization promoter are injected and polymerized and cured to form a resin lining on the bearing surface, and the shaft slides on the resin lining. 1. A method for producing a sliding part, which comprises the step of heating a molten omega-lactam containing the polymerization catalyst at a temperature of around 110°C.