JPS6081215A - Ultra-high-molecular-weight polyethylene composition - Google Patents

Abstract

PURPOSE:The titled composition having improved flow properties even with keeping wear resistance and chemical resistance, making thin molding possible, obtained by adding an additional matter such as styrene monomer, etc. to an ultra-high-molecular-weight polyethylene. CONSTITUTION:100pts.wt. ultra-high-molecular-weight polyethylene having >=2,000,000 average polymerization degree is blended with preferably 3-20pts.wt. styrene monomer, and if necessary, 0.5-10pts.wt. metal soup (e.g., Ba stearate, etc.) of IIa or IIb group, to give the desired composition.

Description

[Detailed description of the invention] Technical field; The present invention relates to ultra-high molecular weight polyethylene compositions, particularly ultra-high molecular weight polyethylene compositions.

Ultra-high molecular weight polyethylene with an average molecular weight of 2 million or more - Additives such as styrene monomer are added to ultra-high molecular weight polyethylene to maintain the properties of the ultra-high molecular weight polyethylene, such as abrasion, while giving it flowability and making it easier to mold. The present invention relates to molecular weight polyethylene compositions.

Prior Art: Ultra-high molecular weight polyethylene has an average degree of polymerization of 1 million or more, and resins with an average degree of polymerization of 6 million are currently being produced. Such ultra-high molecular weight polyethylene has high hardness and excellent wear resistance.

However, due to the strong cohesion between molecules, the 711 resistance is poor.

Very difficult to mold. Generally, one-hole molding is performed under pressure and high temperature. If a special shape of resin is required, the product cannot be supplied at a low price because it is processed by cutting. In addition to the above-mentioned pressure pressing method, attempts have been made to use ram extraction and extrusion molding using special single- or double-screw equipment, but the productivity is poor and the cost is comparable to the press-cutting method, making it impractical. Japanese Unexamined Patent Publication No. 51-90360 discloses a screw used in the crosstalk/forming process. However, even with this disclosed technology, the flowability of the resin is not essentially improved, and the flowability of the molten resin in the molding machine is still poor, so that it penetrates only slowly. This results in poor productivity and high costs.Furthermore, molding of this resin requires a high temperature of 2° to 250°C, similar to the pressure pressing method and extrusion method described above. Decomposition occurs and the molecular weight decreases.For this reason.

Wear resistance decreases. JP-A-58-59243 discloses an example in which approximately 3 parts of an aliphatic cyclic hydrocarbon polymer is added to facilitate molding. Although the resin is diluted by the additive and the flowability is slightly improved, it is still not sufficient, so this method of molding can only be applied to specific molding equipment such as extrusion molding machines. Furthermore, since the zero degree of the ultra-high molecular weight polyethylene itself becomes thinner, chemical resistance and abrasion resistance are reduced.

Object of the invention: The object of the invention is to obtain ultrahigh molecular weight 1. It is an object of the present invention to provide an ultra-polymer +j4" polyethylene fiber composition that has curing properties and is easily molded without reducing the abrasion resistance and chemical properties of polyethylene. It is an object of the present invention to provide an ultra-high molecular weight polyethylene composite material that has high properties and can be molded into thin walls, thereby making it possible to supply molded products at low prices.

Summary of the invention: The polyethylene tlffl product of the present invention has an average degree of polymerization of 2
It contains ultra-high molecular weight polyethylene and styrene monomers of more than 1,000,000, thereby achieving the above objectives.

The uninvented ultra-high molecular weight polyethylene composition also has an ultra-high molecular weight polyethylene composition with an average concentration of 2,000,000 January 7, and styrene monomers.
) h containing at least one block of metallic soap, whereby the above object is achieved.

The styrene monomer is preferably 1 to 100 parts by weight, preferably 3 to 20 parts by weight, per 100 parts by weight of high molecular weight polyethylene.
llNi'tgflノ$U合TE containing salel. l rRh
If the l part is reduced, the purpose of the present invention will not be achieved, and 10
If it exceeds 0, the abrasion resistance and solvent resistance of the resin will decrease significantly. The styrene monomer acts as a shoulder strap for the ultra-high molecular weight polyethylene and imparts healing properties. Furthermore, the added heat causes a polymerization reaction. At high temperatures, styrene monomer or modified polymers act as a solvent for ultra-high molecular weight polyethylene.

After 1j shaping, it completely changes into a polymer due to residual heat. The polymer that is cooled and solidified in a room has a network structure and has appropriate strength, so it does not impair the wear resistance, chemical resistance, etc. inherent to ultra-high molecular weight polyethylene.

In addition, metal soap from group A of the periodic table [A, jib group] is used as a lubricant in a proportion of 0 to 100 parts by weight of ultra-high molecular weight polyethylene composition.
．． It is contained in a proportion of 5 to 10 parts by weight. The metal soap is an organic carboxylic acid having 10 to 32 carbon atoms, such as magnesium salt or calcium salt.

These are strontium salt, barium salt, zinc salt, and cadmium salt. If the carbon constant is within the above range, the metal salt is several fff
i i1 may be combined.

Fruit fat example; The present invention will be described below with reference to preferred embodiments.

Example 1 Seven parts of 100-h polyethylene with an average degree of polymerization of 2 million and 5 parts of styrene monomer (1 part) were placed in a super mixer and mixed at 100C.
Extrusion molding was carried out at 240 to 260° C. using a twin-screw extruder with a diameter of 15 cm to produce a sheet with a width of 15 crn and a thickness of 2 imaginary. The extrusion speed and the amount of extrusion per minute (sheet weight) were determined.Next, 200 mesh of molding sand was sprayed from the nozzle onto this sheet, and the sheet was heated.
The amount of wear per 00g was measured. The results are shown in the table below.

Example 1 except that a portion of 100 tons of ultra-high molecular weight polyethylene with an average degree of polymerization of 2 million, 5 parts of heavily damaged styrene monomer, and 3 parts by weight of calcium moncitate salt were used.
It is similar to

Comparative Example 1 The same procedure as in Example 1 was carried out except that only ultra-high polymer + polyethylene with an average degree of polymerization of 2 million was charged into a super mixer. However, it was not possible to obtain a sheet-like or shaped product.

1-1・Example 2 The same as Example 1 except that only polypropylene was used.

Ratio 11: Example 3 An ultra-high polymer with an average degree of polymerization of 2 million is polyethylene 24
Everything is the same as in Example 1 except that compression molding was performed at 0°C.

Example 3 Ultra-high molecular weight polyethylene 100 with an average lh content of 1,000,000
All procedures were the same as in the example except that M-type part, styrene monomer 3 ili part, and 1 part by weight of barium stearate were used.

Example 4 Ultra high polymer 1) with an average degree of polymerization of 6 million; polyethylene 10
The same procedure as in Example 1 was repeated except that 8 parts by weight of 01, 10 parts by weight of styrene monomer and 3 parts by weight of barium stearate were used. It is R.

Implementation (column 5 Average U [now 6 million, I ultra high polymer -; 1; polyethylene 10 () parts by weight, styrene monomer 50: Jt
All except that the i5 part and the barium stearate 3 heavy part were used were the same as in Setsu VI 14zlJ1.

Example 6 Ultra high polymer with average degree of polymerization of 6 million + 11 polyethylene 10
The procedure was the same as in Example 1 except that 0 parts, 100 ff1 parts of styrene monomer, and 5 parts by weight of barium stearate were used.

Ratio example 4 Ultra high polymer with average degree of polymerization of 6 million) i゛Polyethylene ref 10
(using 0 parts by weight and 120 parts by weight of styrene monomer)
Everything else is the same as in Example 1.

Soup Comparative Example 5 6 parts (100 tons) of ultra-high molecular weight polyethylene (average 6 million) and 111 parts (3 parts) of stearic barium were charged into a super mixer, and the same procedure as in Example 1 was carried out. However, they were unable to obtain a molded product.

Ratio 1 Example 6 Only ultra-high polymer polyethylene having an average degree of polymerization of 6,000,000 was charged into a super mixer, and the same procedure as in Example 1 was carried out. However, it was not possible to obtain a father-shaped sheet molded product.

Comparative Example 7 Same as Example 1 except that only ultra-high molecular weight polyethylene with an average degree of polymerization of 200,000 was used.

Comparative Example 8 Ultra-high molecular weight polyethylene 1 with a 1+1-uniform weight and a Q degree of 200,000
The procedure was the same as in Example 1 except that 00 parts by weight and 3M parts of barium stearate and 3M parts of barium stearate were used.

Effects of the invention: According to the composition of the present invention, since the styrene monomer that can be turned into a polymer by heating is added,
4'B It is possible to improve flowability without sacrificing the excellent properties such as abrasion resistance of ultra-high molecular weight polyethylene, and as a result, molding can be carried out easily. Therefore, the productivity of molded products is improved, and molded products can be supplied at low prices.

The composition of the present invention further includes a lubricant as a lubricant.
Since the Ta-11b group metal soap is added, the flowability of the soap is further improved.

Applicant: Procedural amendment (voluntary) 1. Indication of the case Patent Application No. 189031 of 1989 2. Name of the invention Ultra-high molecular weight polyethylene composition 3. Person making the amendment Related: Patent applicant postal code: 530 Address: 2-4-4 Nishitenma, Kita-ku, Osaka, Japan Patent Department, Tokyo (03) 434-5524 Subject of amendment 5 Contents of amendment (1) Scope of claims attached Correct as shown.

(2) Line 2 from the bottom of page 2 of the specification, line 1 from the bottom of page 4, line 2 from the bottom of page 4, line 4 of page 5, line 1 of page 6
Line 4, line 5 on page 7, line 10 on page 18, line 2 on page 8, line 7 on page 7, line 12 on page 17, line 17 on page 9 Line 2, line 6 of the same page, line 12 of the same page, line 1 of the same page
In line 7 and the bottom line of the same page, the words ``average degree of polymerization'' will be corrected to ``average molecular weight.''

6. List of attached documents (1) Documents stating the scope of the amended claims 1 or more Claims after the amendment ``1. High molecular weight polyethylene composition.

2. The ultra-high molecular weight polyethylene composition according to claim 1, wherein the styrene monomer is contained in a proportion of 1 to 100 parts by weight based on 100 parts by weight of the ultra-high molecular weight polyethylene.

3. Ultra-high molecular weight polyethylene with an average molecular weight of 2 million or more, styrene monomer, and (j8M Table 11a/■b
An ultra-high molecular weight polyethylene #1 composition containing at least one group metal soap.

(The ultra-high molecular weight polyethylene composition according to claim 3, wherein the styrene monomer is contained in a proportion of 1 to 100 parts by weight based on 100 parts by weight of the ultra-high molecular weight polyethylene.

5. The metal stone #L is a magnesium salt, a calcicum salt, a stronticum salt, or a varicum salt of an organic carboxylic acid having a carbon number of 1θ to 32.

The ultra-high molecular weight polyethylene composition 0 according to claim 3, which is at least one selected from the group consisting of zinc salts and cadmium salts.

Claims (1)

[Claims] 1. An ultra-high molecular weight polyethylene composition containing an ultra-high molecular weight polyethylene and a styrene monomer having an average II' of 2 million or more. 2. The ultra-high molecular weight polyethylene m-acid according to claim 1, wherein the styrene monomer is contained in an amount of 1811 parts of 1 to 100 N per 100 parts by weight of the ultra-high molecular weight polyethylene. 3. Ultra-high molecular weight polyethylene with an average degree of polymerization of 2 million or more, styrene monomer, and fMjL table na/11b
A superpolymer "π polyethylene t*l rrM product containing at least one type of group metal maple soap. 4. The styrene monomer is added to the ultra high molecular weight dynamic polyethylene 1100 tlR part to give 1 to 100 parts, lf.
The ultra-high molecular weight polyethylene composition according to claim 3, wherein the ultra-high molecular weight polyethylene composition is contained in a proportion of 1. 5. The metal soap is at least one selected from the group consisting of magnesium salts, calcium salts, strontium salts, barium salts, zinc salts and cadmium salts of organic carboxylic acids having 10 to 32 carbon atoms. The ultra-high molecular weight polyethylene composition according to scope 3. 6. The metal soap is made of the ultra-high molecular weight polyethylene 100
The ultra-high molecular weight polyethylene composition according to claim 3, which is contained in a ratio of 0.5 to 10 parts by weight based on parts by weight.