JPS58155918A - Molding method of polymer molded object having surface covered with ultra-high-molecular-weight polyethylene molded object - Google Patents

Abstract

PURPOSE:To obtain a firm bonded face, by providing the powder layer of an ultra-high-molecular-weight polyethylene on the surface of a polymer molded object and molding this at the temperature above the crystalline melting point of the ultra-high-molecular-weight polyethylene and below 300 deg.C and under a pressure above 5kg/cm<2> and below 500kg/cm<2>. CONSTITUTION:The powder layer of an ultra-high-molecular-weight polyethylene is provided on the surface of a polymer molded object and this is molded at a temperature above the crystalline melting point of the ultra-high-molecular- weight polyethylene and below 300 deg.C, preferably above 150 deg.C and below 250 deg.C, and under a pressure above 5kg/cm<2> and below 500kg/cm<2>, preferably above 10kg/ cm<2> and below 250kg/<2>. By this, a polymer molded object having a firm bonded face due to the formation of both sea island layers at a boundary face between the polymer and the ultra-high-molecular-weight polyethylene and a surface covered with the ultra-high-molecular-weight polyethylene can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION In the present invention, when coating the surface of a polymer molded body with ultra-high molecular weight polyethylene, ultra-high molecular weight polyethylene powder or granite is always added to the interface between the polymer and the ultra-high molecular weight polyethylene. - The surface of the ultra-high molecular weight polyethylene is characterized by having a strong bonding surface by forming a seabird layer on the interface between the two by heating and pressurizing the ultra-high molecular weight polyethylene at a temperature higher than the crystal melting point of the ultra-high molecular weight polyethylene. All plastics are 3° ultra-high molecular weight polyethylene.

It has the highest abrasion resistance of all types, and also has excellent physical properties such as low coefficient of friction, low-temperature impact resistance, and sound deadening properties, making it suitable for linings of hopper shooters, conveyors, screws,
Used for pickers, etc.

However, despite the high melting temperature of ultra-high molecular weight polyethylene, polymer chains break at high temperatures or under high mechanical stress, resulting in a decrease in molecular weight. is damaged.

Therefore, during molding, it is necessary to avoid applying high temperatures or high mechanical stress as much as possible.

For example, in compression molding, in order to mold a 30 m sheet, it is necessary to perform a long period of molding at a relatively low temperature of 200 to 220°C for 3 hours. It has drawbacks in terms of molding process, such as requiring the use of a machine and having a very low extrusion speed due to its high melt viscosity.

Therefore, in the conventional method, the cycle required for molding is long, resulting in high molding cost, and since only one type of ultra-high molecular weight polyethylene is used, the heat resistance, dimensional stability, and creep resistance of the molded product are poor.

Furthermore, because molding is difficult, many simple shapes are formed into sheets or rods, so cutting must be used to obtain molded bodies with complex shapes, making it economical to produce molded bodies with free shapes. It was extremely difficult to obtain this information.

Attempts to improve molding processability by focusing on the abrasion resistance, low coefficient of friction, low-temperature impact resistance, sound dampening properties, etc. possessed by ultra-high molecular weight polyethylene have already been published in Japanese Patent Publication No. 43-24525,
This is done by mixing a large amount of plasticizer, lubricant, etc., as disclosed in Japanese Patent Publication No. 44-27463.

However, in general, mixing large amounts of plasticizers, lubricants, etc. in order to improve moldability does improve moldability, but tends to significantly reduce physical properties, especially wear resistance. .

Conventionally, since the surface of ultra-high molecular weight polyethylene is inert, it is difficult to bond ultra-high molecular weight polyethylene and polymer molded bodies.
It was considered extremely difficult.

In order to improve the above-mentioned drawbacks, the inventors of the present invention have proposed a method for producing a polyolefin or polyolefin copolymer whose surface is coated with an ultra-high molecular weight polyethylene molded article in the earlier application (filed on March 5, 1982, title of the invention). As a result of examining the bondability of many polymers with ultra-high molecular weight polyethylene, we found that it is possible to form molded objects of polyolefin or polyolefin copolymer, powder, granules, pellets, or mixtures thereof with ultra-high molecular weight polyethylene. It has been discovered that a strong bond can be obtained by heating and pressing a high molecular weight polyethylene molded article at a temperature higher than the crystal melting point of the ultra high molecular weight polyethylene.

However, the polymers preferably used in the present invention are limited to polyolefins or Bo-11 olefin copolymers, and although their bonding strength is quite strong, it does not necessarily fall into a sufficiently high category. Therefore, its uses are naturally limited.

The present inventors have also conducted extensive research in order to provide polyolefins or polyolefin copolymers with even stronger bonding strength.

As a result, if ultra-high molecular weight polyethylene powder or granule or a mixture thereof is always present at the interface between many polymers and ultra-high molecular weight polyethylene, and the mixture is heated and pressurized at a temperature higher than the crystal melting point of ultra-high molecular weight polyethylene,
It was discovered that a sea-island layer is formed between the two at the interface, resulting in strong bonding strength. Ultra-high molecular weight polyethylene is produced by heating and pressing a polymer molded body molded to match and a powder mixture layer of ultra-high molecular weight polyethylene provided in between to a temperature higher than the crystal melting point of ultra-high molecular weight polyethylene. It has been discovered that a sea-island layer is formed at the interface between the polymer and the polymer, resulting in strong bonding strength.

Furthermore, the present invention was completed by discovering that the method of the present invention improves physical properties such as moldability, heat resistance, dimensional stability, creep resistance, flexibility, and cushioning properties.

In the present invention, the following molding method can be used.

The first method is to provide a powder layer of ultra-high molecular weight polyethylene on the surface of a polymer molded body that has been previously formed into a desired shape, and to apply this powder layer to a powder layer that is higher than the crystalline melting point of ultra-high molecular weight polyethylene.
00℃ or less, preferably 150℃ or more and 250℃ or less, 5 kVcr1 or more and 1 in 500 or less, preferably 1
0 kVcr! By molding under a pressure of 250 kVcIIt or less F, a sea-island layer is formed at the interface between the polymer and the ultra-high molecular weight polyethylene, resulting in a strong bonding surface. This is a method for molding a polymer molded body coated with ultra-high molecular weight polyethylene.

The second method is to apply a 0.000-molecular weight per d between a pre-formed ultra-high molecular weight polyethylene molded body and a polymer molded body molded so that the shape corresponds to the ultra-high molecular weight polyethylene molded body.
A layer of an ultra-high molecular weight polyethylene powder mixture of 5P or more, preferably 0.012
℃ or higher and 250℃ or lower (7) Temperature [,5Vcr1 or higher 5 Q
By molding under a pressure of OkVcIIt or less, preferably 10kVcII or more and 250k55/m or less, a sea-island layer is formed at the interface between the polymer and ultra-high molecular weight polyethylene, and a strong bonding surface is obtained. This is a method for molding a polymer molded body whose surface is covered with a molded body of ultra-high molecular weight polyethylene.

In the case where a powder layer of ultra-high molecular weight polyethylene is provided by the first method and a layer of a powder mixture of ultra-high molecular weight polyethylene is provided by the second method, heating and pressure is applied to a temperature higher than the crystal melting point of the ultra-high molecular weight polyethylene. As a result, while sintering itself, it also diffuses or is pushed into the softened polymer, forming an island layer and providing strong bonding strength.

However, when a powder layer or a powder mixture of a polymer to be bonded is provided instead of a powder layer or a powder mixture of ultra-high molecular weight polyethylene, even when heated and pressurized, the , a sufficiently strong bonding force cannot be obtained for many polymers.

This is thought to be due to the fact that ultra-high molecular weight polyethylene is inherently molten (7), and the molded product has already been sintered, so the degree of diffusion is extremely small.

The ultra-high molecular weight polyethylene used in the present invention means a composition containing as a main component a polyethylene having a viscosity average molecular weight of 500,000 or more, preferably 1 to 1,000,000 or more.

Additives to ultra-high molecular weight polyethylene include paraffin wax and low molecular weight polyethylene wax.

Aliphatic hydrocarbons such as alcohol, alicyclic hydrocarbons such as cyclopentene and cyclopentadiene, higher alcohols such as cetyl alcohol and alcohol, aliphatic esters such as butyl oleate, and higher aliphatics such as zinc stearate. There are plasticizers such as metal salts, lubricants, surfactants, etc., and those contained alone or in a mixture of two or more can be preferably used in the present invention. .

The ultra-high molecular weight polyethylene powder mixture as used in the present invention is mainly composed of ultra-high molecular weight polyethylene powder or granule, or a mixture thereof, and may include silica powder, calumium carbonate, alumina, hydroxide, etc. Fillers such as aluminum and carbon black, plasticizers,
Contains additives such as lubricants, stabilizers, and colorants.

The reason why the first method uses an ultra-high molecular weight polyethylene powder layer and the second method uses a layer of an ultra-high molecular weight polyethylene powder mixture is that the addition of fillers improves the wear resistance of the ultra-high molecular weight polyethylene. , because it significantly impairs the low coefficient of friction.
A layer of a powder mixture of ultra-high molecular weight polyethylene cannot be used for the surface layer of the compact, that is, the first method.

If the temperature is below the crystal melting point of ultra-high molecular weight polyethylene, 7intering of ultra-high molecular weight polyethylene will not occur and the bonding strength will be insufficient, and if the temperature is above 300°C, ultra-high molecular weight polyethylene will thermally decompose. , is not preferable because the physical properties deteriorate.

If the pressure is less than 5 kVcd1, the time required for sintering will be long and the bonding force will be weak, which is undesirable.
For oolcp7 or higher, there is no difference in the time required for intertaring, and no further pressure is required.

When providing an ultra-high molecular weight polyethylene powder or granule layer between a polymer molded body and an ultra-high molecular weight polyethylene molded body, if the density is less than 0.005 per d, a sufficient sea-island layer cannot be formed and sufficient strength cannot be obtained. I can't get it.

The adhesive surface of the polymer or ultra-high molecular weight polyethylene used in the present invention may have irregularities, protrusions, or depressions formed in advance, and in that case, those having irregularities, protrusions, or depressions of 200μ or more can be preferably used. The formation of the unevenness, protrusion, or depression is not necessarily an essential condition.

Among the polymers mentioned in the present invention, those that can be most preferably used are high, medium, or low density polyethylene, polypropylene, polybutene, polybutadiene, polyisoprene,
Polyolefins such as polyvinyl acetate and polybentenamer, or ethylene-propylene copolymers, ethylene-
These are copolymers such as propylene-diene copolymer, ethylene-vinyl acetate copolymer, styrene-butadiene copolymer, etc. Among them, those that can be preferably used are nylon 4
, nylon 6, nylon 11, nylon 12, nylon 6/6, nylon 6010, homopolyamide or copolyamide, polycarbonate, methyl methacrylate, etc. Usable materials include polyacetal, polyethylene terephthalate, polybutylene terephthalate. Saturated polyesters such as polyester, polyacrylonitrile, styrene-acrylonitrile copolymer,
There are copolymers such as styrene-butadiene-acrylonitrile copolymer, and the like.

It also contains the above polymers as main components, including glass fiber, carbon fiber, silica powder, calcium carbonate,
Those containing fillers such as alumina, aluminum hydroxide, carbon black, etc., or additives such as plasticizers, stabilizers, lubricants, vulcanizing agents, colorants, antistatic agents, etc., can also be preferably used.

The ultra-high molecular weight polyethylene molded product referred to in the present invention is a product of any shape such as a film, sheet, plate, cylinder, hollow, square prism, etc., and is mainly thin-walled, but in some cases, it may be partially or entirely thick. It may be thick.

The polymer molded product referred to in the present invention is a molded product that shortens the molding cycle and has properties such as heat resistance, dimensional stability, creep resistance, flexibility, and cushioning properties in order to obtain a molded product with the desired wall thickness and shape. It is a holding material for ultra-high molecular weight polyethylene to improve the quality of the ultra-high molecular weight polyethylene. It is desirable that the bonding surface has the same shape as the bonding surface.

In the present invention, a polymer molded body whose surface is coated with ultra-high molecular weight polyethylene is a shape that corresponds to the intended use, and whose surface has direct wear resistance, low coefficient of friction, low-temperature impact resistance, sound damping properties, This refers to a molded article in which the parts that require the following are covered with ultra-high molecular weight polyethylene.

According to the present invention, by providing a powder or granule layer of ultra-high molecular weight polyethylene at the interface between the polymer and ultra-high molecular weight polyethylene, it is possible to mold ultra-high molecular weight polyethylene alone, which was conventionally obtained by long-term sintering. To obtain an integrally molded polymer body whose surface is coated with ultra-high molecular weight polyethylene, having the same wall thickness and shape as the body, with a very short molding cycle, that is, at a low cost, and with an extremely strong bond. I can do it.

Furthermore, one of the economic effects of the present invention is that the amount of expensive ultra-high molecular weight polyethylene used can be significantly reduced.

Furthermore, since many polymers can be selected depending on the use and purpose, physical properties such as heat resistance, dimensional stability, creep resistance, flexibility, and cushioning properties can be significantly improved.

In addition, conventionally, molded objects with complex shapes were obtained by cutting, but according to the method of the present invention, since ultra-high molecular weight polyethylene is used in a relatively thin wall, moldability is improved, and molded objects with complex shapes can be obtained. It can also be efficiently molded in one piece.

The present invention will be specifically explained below using Examples and Comparative Examples.

Example 1 A polypropylene sheet (25W x 45) x 3 tries) previously molded under normal molding conditions is placed in a compression mold, and ultra-high molecular weight polyethylene (Hyzex Million 240M, Mitsui Petrochemical Co., Ltd.) is placed on top of it.
21, heated under 50 kVcII pressure for 15 minutes, raised the temperature to 200°C, and kept at 200°C and 50°C for 5 minutes.

Thereafter, cooling was started and the temperature was raised to 50° C. for 10 minutes.

By the above method, a polypropylene sheet whose surface was coated with ultra-high molecular weight polyethylene was obtained.

Table 1 shows the appearance of the obtained sheet, and the results of the beating abrasion test, tensile test, and heat cycle test.

The respective test methods are as follows.

(1) Tapping abrasion test An iron bar weighing 5 kg (2 scratches in diameter) was allowed to fall naturally onto the center of the sheet from a height of 7 m 100 times, and the condition of the sheet at that time was observed.

(2) Tensile test 25W×45×O, 1tws when molding the above sheet
A piece of aluminum foil was placed between the two sheets in advance as shown in Figure 1, and the resulting sheet was pulled in the thickness direction to determine the bonding force between the two sheets.

(3) Heat cycle test The obtained sheet was subjected to one cycle of -40°C x 30 minutes + 80°C x 30 minutes, and the state of the sheet after 5 cycles was observed.

Examples 2 to 13 Each sheet was obtained in the same manner as in Example 1, except that the molding was performed using the polymer and heating temperature shown in Table 1. The test results of the obtained sheet are shown in Table-1.

Example 14 A polypropylene sheet (25W x 45) Put it in a mold.

At that time, 0.5% ultra-high molecular weight polyethylene powder is placed between both sheets in advance. Put it in.

This was heated under a pressure of 50 kfI/CI/l for 15 minutes to raise the temperature to 200°C, and then kept at 200°C.
, hold for 5 minutes on the elm at 50°C.

Thereafter, cooling was started and brought to 50° C. for 10 minutes. By the above method, a polypropylene 7-tate whose surface was coated with ultra-high molecular weight polyethylene was obtained.

The test results of the obtained sheet are shown in Table 1.

Examples 15 to 19' Each 7'-t was obtained in the same manner as in Example 14, except that the molding was performed using the polymer and heating temperature shown in Table 1.

The test results of the obtained sheet are shown in Table 1.

Example 20 A sheet was obtained in the same manner as in Example 1, except that the ultra-high molecular weight polyethylene was an ultra-high molecular weight polyethylene composition containing 3% of polyethylene wax having a molecular weight of 2000 (Hoechstwax PA520) as an additive.

The test results of the obtained sheet are shown in Table-1.

Example 21 Same as Example 14 except that the ultra-high molecular weight polyethylene powder used for the intermediate layer between the ultra-high molecular weight polyethylene sheet and the polypropylene sheet is a powder of an ultra-high molecular weight polyethylene composition containing 3% carbon black. I got the sheet using this method.

The test results of the obtained sheet are shown in Table-1.

Comparative Examples 1 to 3 Each sheet was obtained in the same manner as in Example 1, except that the molding was performed using the polymer and heating temperature shown in Table 1.

The test results of the obtained sheet are shown in Table-1.

Comparative Example 4 A polypropylene sheet (25w x 451! Heat it for 15 minutes under 50 ki7 pressure to raise the temperature to 200℃, then heat it at 200℃ and 50℃ for 15 minutes.
Hold at kP/m for 5 minutes.

After that, cooling was started and the temperature was raised to 50° C. for 10 minutes.

By the above method, a polypropylene 7-tate whose surface was coated with ultra-high molecular weight polyethylene was obtained.

The test results of the obtained sheet are shown in Table-1.

Comparative Examples 5 to 7 Each sheet was obtained by molding using the polymer and heating temperature shown in Table 1 (other than that, in the same manner as in Comparative Example 4).

The test results of the obtained sheet are shown in Table-1.

Comparative Example 8 3.35' polypropylene was placed in a compression mold,
On top of that, a sheet of ultra-high molecular weight polyethylene (25W x 45j!'X2'
tn) and heated under 50' kYcr & pressure to 1
Raise the temperature to 200℃ for 5 minutes, then keep it at 200℃.
℃ and 50 kVcI/l for 5 minutes.

After that, cooling started and 50U and 1. Ta.

A sheet of polypropylene whose surface was coated with ultra-high molecular weight polyethylene was obtained by the above method.

The test results of the obtained sheet are shown in Table-1.

Comparative Examples 9 to 11 Each sheet was obtained in the same manner as Comparative Example 8 using the polymer and heating time shown in Table 1 (except for -).

Table 1 shows the test results for the notebooks obtained.

Table-1 Note 1: The molding methods in Table 1 have the following meanings.

A: Molding method using ultra-high molecular weight polyethylene powder and polymer molded body.

B: A molding method using an ultra-high molecular weight polyethylene molded body, a polymer molded body, and an ultra-high molecular weight polyethylene powder as an intermediate layer thereof.

C: A molding method using a powder of an ultra-high molecular weight polyethylene composition containing additives and a polymer molded article.

D: A molding method using an ultra-high molecular weight polyethylene molded body, a polymer molded body, and a powder of an ultra-high molecular weight polyethylene composition containing a filler in an intermediate layer thereof.

E: Molding method using an ultra-high molecular weight polyethylene molded body and a polymer molded body.

F: ultra-high molecular weight polyethylene molded body and polymer powder,
Molding method using granules or pellets.

Note 2 The test results in Table 1 have the following meanings.

(1) Appearance: Good means that there is no peeling immediately after taking it out from the mold.

(2) Tapping abrasion test: Good means that there is no peeling after the test.

(3) Heat cycle test: Good means that there is no peeling after the test.

Note 3: In the tensile test, the tensile jig used was 25.0
If it exceeds 1, it will be damaged, so those that do not peel off after 25.0 ky are indicated as 25.0 (.

Example 22 A 7-t'l film of polypropylene whose surface was coated with ultra-high molecular weight polyethylene was heated in the same manner as in Example 1 except that it was kept at 200°C and 50 kFm for 20 minutes. Ta.

Table 2 shows the test results for the notebooks obtained.

Example 23 The surface was coated with ultra-high molecular weight polyethylene in the same manner as in Example 1, except that the temperature was raised to 200 °C in 8 minutes under a pressure of 50 kVcjI, and cooling was immediately started and the temperature was raised to 50 °C in 10 minutes. A sort of polypropylene was obtained.

The test results of the obtained sheet are shown in Table 2.

Table 2゛Note: Please refer to the notes in Table 1 for the molding method and test results.

The drawings are merely schematic representations, and the linear boundaries between the components shown in the drawings are provided provisionally for the convenience of explanation. It does not indicate that.

Furthermore, the expressions such as "or" or "or" in the text are concepts that also include the meaning of "and."

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a test piece in a tensile test, FIG. 2 is a plan view thereof, and FIG. 3 is a side view thereof. a - Aluminum foil (25WX45fflX0.1tW!
n), b...Ultra-high molecular weight polyethylene layer, C...Polymer layer Note that the arrow indicates the direction of tension. Patent Applicant: Asahi Yokuzai Kogyo Co., Ltd. Procedural Amendments (Confrontation) Showa, J/7'l Tsu Month 711 Commissioner of the Patent Office Mr. Nu≧Sugine Kouo rl, 1, Case indication A4 no hB, ¥9 extra 3PB3 Relationship to the incident 5t-p Blood, g< Name (Name) Ta-san, Zaiji-gyomasu? A candlelight 4, deputy person Z neφ', Eh ward admission man zu metohinoysu. ~ 1) 9 In the first line of page 6 of the present specification, the phrase ``to bond'' is corrected to ``1 bond.'' 2) In the second line of page 7 of the same book, the phrase ``to extend'' has been corrected to ``to have.'' 3) In the same book, on page 8, line 18, the phrase ``on the surface'' is corrected to ``the surface.'' 4) Delete "correspondingly" in the first line of page 9 of the same book. 5) Delete the word ``Nakadaka'' on page 13, line 8 of the same book. 6) In the second line of page 16 of the same book, the phrase "by cutting" is corrected to "by cutting." 7), in the 9th line of page 21 of the same book, the phrase ``heating time was used'' is corrected to ``1, which was molded at heating temperature.'' 8), in the third line from the bottom of page 24 of the same book, the word "and" is corrected to "to". 9), the text ``1 composition'' on page 25, line 8 of the same book will be deleted. 10) In the 8th line of the same page in the same book, the phrase “with powder” was replaced with “
"With a powder mixture," I am corrected. Amendment of the above procedures 1 September 1982 II/II 2, Name of the invention 3, Relationship to the case of the person making the amendment Name of patent applicant (name) Asahi Yokuzai Kogyo Co., Ltd. Claims (1) In order to coat the surface of the polymer molded body with ultra-high molecular weight polyethylene, a powder layer of ultra-high molecular weight polyethylene is provided on the surface of the polymer molded body, and this is heated at a temperature above the crystal melting point of the ultra-high molecular weight polyethylene and below 300°C and 5 kV. −
More than 500k7. By molding under a pressure of J or less, a sea-island layer is formed at the interface between the polymer and ultra-high molecular weight polyethylene, resulting in a strong joint surface.The surface is coated with ultra-high molecular weight polyethylene. A method for molding a polymer molded article. (2) In order to coat the surface of the polymer molded body with ultra-high molecular weight polyethylene, the ultra-high molecular weight polyethylene is placed between the ultra-high molecular weight polyethylene molded body and the polymer molded body molded to match the shape of the ultra-high molecular weight polyethylene body. A layer of a powder mixture is provided, and this is heated to a temperature higher than the crystalline melting point of ultra-high molecular weight polyethylene by 30°C.
By molding at a temperature of 0°C or less and a pressure of 5 krJ or more and 500 kri or less, a seabird layer of both is formed at the interface between the polymer and ultra-high molecular weight polyethylene, resulting in a strong contact surface. A method for molding a polymer molded article whose surface is coated with ultra-high polymer needle polyethylene. (3) The following polymers, high, medium,
or polyolefins such as low density polyethylene, polypropylene, polybutene, polybutadiene, polyisoprene, polyvinyl acetate, polypentenamer, or ethylene-propylene copolymer, ethylene l-propylene-
Copolymers such as diene copolymer, ethylene-vinyl acetate copolymer, styrene-butadiene copolymer, styrene-acrylonitrile copolymer, styrene-butadiene-acrylonitrile copolymer, or polyacrylonitrile, ' or nylon 4, One type of homopolyamide or copolyamide such as nylon 6, nylon 11°, nylon 12, nylon 6/6, nylon 6/10, saturated polyester such as polyethylene terephthalate, polybutylene terephthalate, polyacetal, polycarbonate, polymethyl methacrylate, or The molding method according to claim 1 or 2, in which two or more types are used. (4) The method according to claim 1, 2, or 3, wherein irregularities, protrusions, or depressions of 200 μ or more are provided in advance on the bonding surface of the polymer molded product or the ultra-high molecular weight polyethylene molded product. Molding method.

Claims (4)

[Claims] (1) In order to coat the surface of the polymer molded body with ultra-high molecular weight polyethylene, a powder layer of ultra-high molecular weight polyethylene is provided on the surface of the polymer molded body, and this is applied at a temperature above the crystalline melting point of the ultra-high molecular weight polyethylene and below 300°C ( 7) Warm i, 5
By molding under a pressure of kicn or more and 500 kVCr1 or less, a sea-island layer is formed at the interface between the polymer and the ultra-high molecular weight polyethylene, resulting in a strong joint surface.The surface is made of ultra-high molecular weight polyethylene. A method for molding a polymer molded body coated with. (2) In order to coat the surface of the polymer molded body with ultra-high molecular weight polyethylene, the ultra-high molecular weight polyethylene molded body and 1. A layer of a powder mixture of high molecular weight polyethylene is provided, and this is heated at a temperature above the crystalline melting point of ultra-high molecular weight polyethylene and below 300°C.
By molding under a pressure of 5 kFm or more and 500 kFm or less, a sea-island layer is formed at the interface between the polymer and the ultra-high molecular weight polyethylene, resulting in a strong joint surface. A method for molding a polymer molded body coated with molecular weight polyethylene. (3) The following polymers, high, medium,
or polyolefins such as low density polyethylene, polypropylene, polybutene, polybutadiene, polyisoprene, polyvinyl acetate, polypentenamer, or ethylene-propylene copolymer, ethylene-propylene-diene copolymer, ethylene-vinyl acetate copolymer, styrene- Copolymers such as butadiene copolymer, styrene-acrylonitrile copolymer, styrene-butadiene-acrylonitrile copolymer, or polyacrylonitrile,
Or homopolyamide or copolyamide such as nylon 4, nylon 6, nylon 11, nylon 12, nylon 6/6, nylon 6/10, or saturated polyester such as polyethylene terephthalate, polybutylene terephthalate, polyacetal, polycarbonate, polymethyl methacrylate. The molding method according to claim 1 or 2, in which one or more of these are used. (4) The method according to claim 1, 2, or 3, wherein irregularities, protrusions, or depressions of 200 μ or more are provided in advance on the bonding surface of the polymer molded product or the ultra-high molecular weight polyethylene molded product. Molding method.