JPS58500240A - Impregnation of porous articles - 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] Impregnation of porous articles The present invention is suitable for use with metals such as porous rigid articles, 4'1 FK metal castings and sintered metal products. in articles such as wood and inorganic materials such as brick, stone, concrete, etc. This relates to the sealing of pores. However, the pores in the material prevent the impregnating agent from washing out. It is important that it is not so large that it will cause damage. In one embodiment of the invention, the It is used to impregnate materials such as paper and cloth with a soaking agent.

Impregnating metal with resin is a well-established method of sealing pores. casting The size and shape of the pores in the casting always vary, and therefore the leakage in the casting The product becomes unusable. Automotive industry, especially where cast parts are under pressure Besides this well-known cause of rejection of castings used in There are a number of problems that may arise. 1. Poor plating, enamel firing. Includes the possibility of corrosion, organic matter entrapment, and bacterial growth. nru.

In general, pores can be divided into three types: through pores, blind pores, and closed pores. Kan Ventilation holes cause air leakage, and it is the pores of this strain that hook makers pay attention to first.

Blind pores with only one inlet on the surface will not create leakage, but will reduce the flow of process liquid. There is no problem as long as it is not present in excess during the surface finish due to absorption.

Other similar defects often encountered in castings include alligator skin, cracks, gas holes, and inclusions. There are things. All these defects are 7° leaks, often mistakenly referred to as pore morphology. When examining a casting marked as porous by an inspector, a corpse was found. Show that the casting actually has crocodile skin, cracks, or gas holes. There are many.

Various methods of sealing pores, which have been widely used over the years, include Includes oil coating and welding. All these techniques are extremely labor intensive , therefore the cost is high. Moreover, there is no guarantee that the process will be successful.

A commonly used linear method is to use a bath of high molecular weight poly-y- be. Immerse the cleaned parts in single Kf# solution for a few minutes, remove, and then evaporate the solvent. If allowed, sealing will be achieved. This technique leaves a thin film of polymer on the surface. Therefore, it cannot be used for highly machined parts that require strict dimensional tolerances.

In addition, some of the required chemical nuclides, anode complexes, or chemical nuclides Surface treatment must be performed before dipping. percolation is limited n stomata tree Filling with fat is incomplete and melting is an unavoidable result of using bath additives, so please fill in twice. The above treatment is not necessary, and the airtightness of the casting under high pressure cannot be expected.

The vacuum impregnation process has been in use for about 25 years. During this time, VCI Bakery From varnishes to sodium silicate and a wide range of polyesters. Many types of sealants have been used with varying degrees of success. The best of this kind The current process uses a specially made unsaturated polyester with high permeability. It is used in combination with low viscosity monomers such as Typically, this unsaturated polyester Tel is a reaction product of phthalic anhydride and oleic anhydride with propylene glycol. It is. Stabilizes the viscosity of the impregnating agent during preparation and prevents excessive curing at temperatures in the region of 130°C The combination of inhibitor and catalyst is selected to give . linear polyester styrene Cross-linking by means of a hard solvent-resistant resin that completely fills the pores is obtained. typical made For the manufacturing process, place the clean, cold casting in an autoclave and heat it to 1z7H. Includes placing under a vacuum of low Q for a minimum of 20 minutes.

At this point, pour the impregnating agent into the autoclave until the liquid level is about 2 inches above the casting. Make it so. The pressure of 90 to 100 pounds per square inch is then applied to the autoclave. Leave in the oven for at least 30 minutes.

Next, the 1-impregnating agent liquid is returned to the storage tank so that the casting can be removed. 7. Send to a cleaning bath to remove a thin layer of surface residue left by the runt. short 9 mizukiri After the first period, soak in oil at 130℃ for 45-60 minutes. As for the last process step, the parts are transported and placed in a hot air recirculation furnace for one hour. Remove dirt from the surface by washing with clean water. With this clever processing method, temperatures ranging from -40℃ to Pressurized and airtight up to 12,000 lb/in2 within +250°C hot water temperature range You can get the sex.

Other systems include, for example, those of the indigo type described in British Patent No. L291108. Some use impregnating agents that harden under anaerobic conditions.

The present invention applies to impregnating agents t% of the type described in British Patent No. L54' (801). However, it is not limited to this type of impregnating agent. This rice curing agent heat cures at a temperature of about 90°C and therefore can be used in bath form or as a spray. It is convenient to harden the casting by contacting it with hot water in the form of a mold.

Conventional impregnation processes were conducted in batches. These processes, for example, Not that it's very useful in dealing with moving vehicle tally blocks. . However, gold &#I6# and relics can be handled individually. Seven AKs are general The casting is sealed off, pressurized from inside with an impregnating agent, and the tube is vacuumed to contain the casting. It is necessary to immerse it in a soaking agent. Both of these two methods reduce the opening of the casting. It cannot be said to be highly desirable because of the inherent problem of sealing. .

According to British Patent Application No. &07 &231 published on 30th September 1981. , the article to be impregnated is placed on a plywood or other support member, and the lid, such as an n1 cylinder, is made of plywood. Place K over the article to form a seal with f′L (K like a glass bell); The upper part of the cylinder is vacuumed (i.e. reduced pressure) and air is taken out from the pores 1'L (for example (for at least 30 seconds), and the impregnating agent is applied under vacuum until it at least covers the pores (preferably for at least 30 seconds). (preferably through the plywood), the vacuum is released and n1 excess impregnant is removed from the lid (preferably through the plywood). When the lid is lifted from the plywood, the lid is removed from the plywood.

Next, one casting was taken up from the plywood and included n1 the aforesaid British Patent No. L54τ801. In the case of soaking agents, the caster may be used for subsequent treatments such as cold water washing and hot water spraying. Place the objects on the conveyor.

In the published UK Patent Application No. 2.072゜231 by the applicant, after impregnation, Cleaning and curing takes place in a tunnel through which the casting passes on a conveyor. death However, such an arrangement takes up a large amount of floor space. Processing conditions, especially time and temperature It has been found that it is desirable to easily control K over the entire history.

According to one aspect of the invention, the cleaning and/or curing is performed by means of a lid that engages the support plate of the article. The process is carried out in one processing chamber or two or more processing chambers. goods on one support Conveyor means are provided for moving from one support plate to the next. or , as described in the said British Patent Application, at least part of the support plate is It can be pre-prepared in part of the yard.

According to another aspect of the invention, the curing of the impregnating agent in the pores is carried out at a temperature in the range of 60-130°C. It is carried out by contact with a gas (preferably air) at a temperature. % British Patent No. L54?80 An impregnating agent such as that described in Specification No. 1 has a very rapid effect on contact with the gas. Not only does hardening take place, but undesirable areas on the surface of the casting are removed before it has had a chance to harden. The impregnating agent is burned off. This means that the process step must be thoroughly cleaned and cleaned beforehand. It means jin which makes floors unnecessary. When draining is insufficient or not fast enough The impregnating agent can be removed by mechanical means such as centrifugation or gas blowing.

In other words, the entire process after impregnation can be carried out in a dry process.

The hot air may be stationary, but is preferably blown onto the article. This means that It may be carried out in a tunnel (e.g. air flow transverse to the direction of motion) or in a static furnace. 0 It is possible for the article to be rotated during the hot air treatment. In addition to heating the product to the impregnating agent curing temperature, the impregnating agent in the pores (apart from thermal curing) ) Vaporizes excess impregnating agent on the surface of the article, leaving AfK substantially unaffected. It was found that it was valid n'ft:. In some cases, the exhaust gases are combusted. It is better to avoid air pollution problems.

For purposes of illustration, embodiments of the invention are described below with reference to the accompanying FIG. .

FIG. 1 of the accompanying drawings shows a side view of the device according to the invention.

2 is an end view of the apparatus of FIG. 1; FIG.

Figure 3 is similar to Figure 2, but with an improved device that processes two items at the same time. show.

FIG. 4 is a cross-sectional view of the improved curing field.

Referring to Figure 1.2, the device supports three air, /11 unders 4, 5, and 6. A frame it with a gantry 2 having a frame it-contains. Each rod of these cylinders is Glass bell-shaped lid 10 that moves between an upper position indicated by a solid line n and a lower position indicated by a chain line n ．． 11s12 is supported. In the lower position, the lids 10, 11, 12 are supported In cooperation with plates 14.1B and 16, the first, second and third processing chambers (from right to left in Figure 1) ) will be established.

The first treatment chamber is an impregnation chamber, as shown in Figures 1 to 3 of the above-mentioned British patent application by Mr. Motoide. The impregnation chamber is operated substantially similar to the impregnation chamber described in . The lid lO is connected to the support plate 14 and the sealing top The N1 impregnant is passed through the support plate 141 through the pipe line 1st and then evacuated. Then enter. Preferably, at the same time, the vacuum in the impregnating agent reservoir is completely released. Do it. The vacuum in the post-impregnation treatment chamber is released, and the nS impregnation agent is passed through the support plate 14t. eject and return.

The second processing W/L has a support plate 15t-holder with a rotatable internal area (not shown). Due to this rotation, the impregnating agent still remaining on the surface of the p1 article is centrifuged. Items can be kept clean. Quantity 11 has a key inside that rotates around the axis. A cap (not shown) t-held, resting on the top of the article and in the interior area of the support plate. [-Keep item on fi. Cold air is sent directly onto the item to blow away excess impregnant. 1 air jet 20 (three ti are shown in Fig. 1) is arranged so that There is. However, cleaning can also be done by centrifugation alone or air jets alone. can. As an alternative to this, Gen) 1 - Ordinary cooling with or without Washing can also be used.

As shown in FIG. 1, the third processing chamber has a pipe 22t for supplying hot water to the lid 12. , the waste water exits through the support plate 161'' and is recirculated.Hot air or water vapor You can also use

The transport system includes fixed rails 25 fixed to the frame 1.

The entire length of this rail runs. The rail 25 has four rollers 26t, and A movable rail sink 7 is attached to the roller. This movable rail is a pneumatic series A placket 28 attached to the main body (not shown) allows the movement of the can be done. On the rail 27 is a transport rail with four arms 30t' spaced apart. 29 is installed. The outer end of each arm 30 has gripping means alt-.

Special case [When it comes to the problem, the article is a vaporizer with an opening at the top, and the gripping means 31 Contains an air V ring arranged to inflate a rubber ring within the opening. . Two parallel rings at each end for mounting the transport rail 29 on the rail 27 32 is used and one additional air cylinder is required to raise and lower it. 84 is used. In this way, the four arms 30 are raised and lowered at the same time. .

With the lid lifted, the arm 30 and its gripping means 31 move the article forward. Placing it on a support plate will make it look better. Next, the arm moves to a position between the urns. and then the lid is lowered. After the processing is completed, the arm 30 is again suspended from the article; Move the item forward again.

As shown in Figure 3, in order to transport two items side by side at the same time, each The arm 30 has two gripping means 31.

As shown in FIG. 4, the support plate 14 has a grating 35, below which is a vertical A motor 37t and an accompanying fan 36 which can rotate around it are arranged. Lid 10 A sleeve 38 is mounted therein with a radial arm (not shown), the sleeve having a perforated Surrounding quality material goods. A dark light heater is placed inside the annular space 41 formed in this way. A tar element 39 is arranged. In practice, air is forced by the fan 36. The article is then recirculated downward through the space 41t. recirculate like this It is economical to burn some gas or steam given by the article 20. In this case, the lid 10 is made of thin stainless steel, which helps to avoid air contamination problems. Ru.

During operation, the transport system unloads the items from one conveyor and transfers them to the other after processing. place on the conveyor.

O Depending on implementation, it may be possible to shorten 15IJ to about 1 minute for 1 cycle. There was a heading.

In one improved method of the invention, the article is cleaned with an organic solvent in a second filtrate and then cleaned with an impregnating agent. is collected. Any solvent remaining on the article is evaporated in the third chamber.

If you wish, you can heat the finished product in a TV oven to harden the finish. You can also do it.

Fta, 2 F103 International Research Center lost

Claims (1)

[Claims] 1. Remove excess impregnating agent from the pores by centrifugal force and by spraying gas. Curing is carried out by gas in the range 6G-180°C, impregnation of porous articles. Method. Li! Claim 1, wherein the gas temperature of the chemical substance is in the range of Zoo-130°C. Method described. a After the hot gas created by the heater element comes into contact with the article, the heater IN 3. A method according to claim 1 or 2, wherein the method is repeatedly recycled. Table: Impregnating agent in chambers and pores for removing excess impregnating agent from articles [For curing From childhood, excessive impregnating agent [removal] 1. A gas machine for air transport or goods oysK) 1, as described in claim 1. Apparatus for carrying out the method described. a. The curing chamber has a heating element and gas flow recirculation of 1,000 Rt. The device according to item 4 of the scope of demand. 6 ts1o support plate for porous medium products, 1st Oii for the support plate, and 101o A means for applying reduced pressure to the upper part of IIO, and for raising and lowering @101it. The means for replenishing the impregnating agent during soaking and the support plate for removing the impregnating agent during coughing A passage means and next to the irises 10 support plate 2 a second support plate at 11 and moving said article from the first support plate to the second support plate; a conveyor means for forming a second treatment i1 in cooperation with a second support plate; a second lid, a means for raising and lowering the second lid; tx2 treatment to clean the article and/or harden the impregnating agent in the pores of the article. impregnating said porous article with means for treating said article in a base; equipment for. ? A third support plate next to the support plate #I2 and a third support plate in cooperation with the third support plate The eighth lid arranged to form a processing chamber and the third lid are raised and lowered. and means for transporting the articles from the first support plate to the second support plate. The jLSth Claim 6, wherein the second chamber is a clean chamber and the third chamber is a curing chamber. Device. a. A conveyor means is placed on a carrier arranged to move alongside the support plate. the free end of the article and the deposit when the arm is raised Claims 1. Claims: 1. A support plate arranged to carry an article and advance it to the next support plate. The device according to paragraph 7. a　The arm moves to a position where it does not align with the mosquito roof when the lid tries to lower. 818. The pm of claim 818, wherein the pm is located at 1. The arm twists when lifting the item from the support plate 13 As described in claim 8 and 9, one carrier is pivot-mounted as shown in FIG. equipment. IL: A conveyor with three support plates arranged so that they move forward when the lid is raised. 8. A device according to claim 7 forming part of a means. IL second support plate includes a rotating carousel for centrifuging excess impregnating agent from the article. An apparatus according to any one of claims 6 to 10. A second lid is provided with a cold air generator to blow away excess impregnating agent from the article. 1. The apparatus according to any one of claims 6 to 10 and 12. 14. Claims in which the second chamber has means for replenishing liquid cleaning fluid Apparatus according to any one of paragraphs 6 to 10 and 12.13. 16 Means for the third chamber to supply hot gas, hot water or steam for curing An apparatus according to any one of claims 6 to 14 having the following. 1a A third chamber has a heating element and circulates the resulting hot air into the chamber. Claims 6 to 14 are provided with fan means so as to The device described in No. Suzun. 1? fi has an internal sleeve for receiving items, and a ring-shaped cavity between the cough sleeve 1 and the lid. A heater element is placed between the holes, a hole is drilled in the support plate, and a fan means is placed in the support plate. under the air heater element and then the article through the mt. 17. The device of claim 16, wherein the device is arranged to move air through the device. .