JPS601145B2 - Thermoplastic composition for grinding - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a thermoplastic polymer composition with high grinding power.

More specifically, the present invention relates to a thermoplastic composition for grinding that improves and improves the grinding force by increasing the adhesion between the grinding abrasive grains and the thermoplastic polymer.

Conventionally, whetstones, abrasive paper, wire brushes, etc. have been used for polishing or grinding.

However, polishing and abrasive materials have poor compatibility with the object to be ground.
It is irreverent for objects to be ground that have many curved surfaces.

Recently, abrasive materials with improved compatibility have been developed, such as those in which abrasive grains are fixed to polymer threads with adhesive, or those in which abrasive grains are mixed into polymer threads. . It is true that the abrasive thread body has improved conformability, but due to insufficient adhesion between the abrasive grains and the thermoplastic polymer, voids are created between the two, and during the grinding process, the abrasive As a result of the grains peeling off and falling off from the synthetic polymer, the grinding force decreases and the grinding filament wears out prematurely, so that it is only used for cleaning or, at best, for polishing.

On the other hand, the coating on steel materials etc. that has a strong oxide coating on the scorched anchor,
Currently, it is common practice to use mineral acids to remove waste acids, but the treatment of waste acids has become a problem in terms of pollution.

Although mechanical grinding is the best way to eliminate such pollution, each of the existing mechanical grinding methods has its own drawbacks.

For example, there is a method of removing the film on the steel material by spraying steel balls or abrasive grains under high pressure, but the equipment is expensive. Scratches the steel material by blowing pressure. It is difficult to select the particle size of the steel balls or abrasive grains, and there are problems such as high noise and pollution, and there are many problems in practical use. As a result of intensive research to solve these problems, the inventors discovered a thermoplastic composition for grinding that met these requirements, and completed the present invention.

This invention ■Thermoplastic polymer.

(2) 0.01 to 2 parts by weight of the elastomeric block copolymer per 100 parts by weight of the thermoplastic polymer.

■ A thermoplastic composition for grinding consisting of ground five-star grains.

Examples of thermoplastic polymers include nylon 6, nylon 6-6, nylon 6-10, nylon 6-12, and nylon 1.
1. Nylon 12, polyamides such as copolymerized nylon containing these, polyethylene terephthalate, polybutylene terephthalate, polyesters containing these copolymers, polypropylene, polyvinyl alcohol, etc., and polyamides and polyesters. The effect is significant.

The elastomeric block copolymer is obtained by block copolymerizing a heterocyclic nitrogen-containing monopolymer containing a conjugated diene and a monivinyl-substituted aromatic hydrocarbon or a pyridine derivative using an organic alkali metal melting medium.

Conjugated genes include 1,3-butadiene, isoprene, piberylene, methylbentadiene, phenylbutadiene, 3,4-dimethyl-1,3-hexadiene, 4,5
In addition to -diethyl-1,3-octadiene, there are conjugated dienes having reactive substitutions along the primary mirror, such as halogenated dienes such as chloroprene and fluoroprene.

Particularly preferred examples of conjugated genes include butadiene and isoprene. Examples of monovinyl-substituted aromatic hydrocarbons include styrene, various alkylstyrenes,
Examples include paramethoxystyrene, vinylnaphthalene, and vinyltoluene.

Heterocyclic nitrogen-containing monomers containing pyridine derivatives include 2-pynylpyridine, 3-vinylpyridine, 4-vinylpyridine, 3-ethyl-5-vinylpyridine, 2-methyl-5-vinylpyridine, 3,5-jethyl-4-vinylpyridine, etc. There is.

The thermoplasticity of block copolymers obtained from these monomers increases as the proportion of conjugated polymers decreases, and within a certain proportion, the above polymers exhibit the properties of a hot-flow rubber that does not require crosslinking or hot-flow. Because of this, it is classified as an elastomer that is called "self-adhesive."

Note that the elastomeric block copolymer used in the present invention may also include a hydrogenated one.

Elastomeric block copolymer is thermoplastic polymer 1
The amount is preferably 0.01 to 2 parts by weight, most preferably 0.1 to 1 part by weight.

If the amount is less than 0.01 parts by weight, the grinding force will be reduced, and if it exceeds 20 parts by weight, the molded product for grinding will become abrasive and the grinding force will be reduced.

The molecular weight of the elastomeric block copolymer is 5000
It is desirable that it is more than 50,000, most preferably 50,000.
That's all.

Any commonly used abrasive grain material may be used, including fused alumina, siliceous carbide, zirconia, carbide, nitride, boride, artificial abrasive materials such as artificial diamond, diamond, corundum, emery, and diamond. Examples include natural abrasives such as stone, poppy, and stone, and glass.

These may be used alone or in combination. The particle size of the grinding abrasive grains is preferably #40 to #1000.

The proportion of abrasive grains in the composition is preferably 10 to 7% by weight; if it is less than 1% by weight, no grinding force can be expected, and if it is more than 7% by weight, molding becomes extremely difficult.

The thermoplastic grinding composition of this invention can be prepared in various ways.

For example, a method involves melting a thermoplastic polymer and adding a low-grain and elastomeric block copolymer to it.

Alternatively, there is a method in which thermoplastic polymer particles or powder are mixed as homogeneously as possible with elastomeric block copolymer particles or powder and abrasive grains, and the mixture is melted and molded in an extruder. The composition of the present invention is used for grinding and polishing in the form of yarn, film or other suitable form.

In addition, when melt-extruding this thermoplastic molding mixture, it is preferable to maintain the temperature at or above the softening point of the thermoplastic synthetic polymer used. When the composition of the present invention is used for grinding and polishing, it exhibits remarkable grinding ability compared to when conventional grinding materials are used.

Next, examples of this invention will be shown.

Example 1 10 parts by weight of nylon 6 chips with a relative viscosity of 32 (1 tapolymer/10 [98% sulfuric acid)] 2 parts by weight of elastomeric floc copolymer and #100 carbide siliceous abrasive grains
Add 4 parts by weight of (J old standard) and mix.

This mixture was melted at 260 pm using a melt extruder, passed through a weaving nozzle and put into paper at room temperature in water, and after being stretched three times, a monofilament with a diameter of 1.0 m/skin was produced. For comparison, monofilaments were manufactured under exactly the same conditions except for the elastomeric block copolymer, and yarns made of both compositions were made into yarns with a diameter of 30 cm and a width of 10 skins.
Thread length (trim): 5 skin roll brush, 2000
Table 1 shows the ability to grind a stainless steel plate at a circumferential speed of 10 min.

As shown in Table 1, the brushes made of abrasive fibers made with the composition of the present invention have significantly improved abrasive power compared to conventional brushes.

The elastomeric block copolymer used in this example was Tuffprene (trade name, manufactured by Asahi Kasei Corporation), which was composed of parts by weight of styrene 4 and parts by weight of Ptagene 6, and was heated at 200°C and 5000°C. It has a melt index of 9. Example 2 To 10 parts by weight of nylon 6 chips having a relative viscosity of 32, 0.01 parts by weight of an elastomeric block copolymer and 25 parts by weight of carbide silica abrasive grains #240 are added and mixed well.

This mixture was melted at 260 pm using a melting machine, passed through a thread nozzle into paper at room temperature, and stretched three times to produce a monofilament with a diameter of 1.0 m/kite. On the other hand, as a comparative example, a monofilament was produced under exactly the same conditions except that no elastomeric block polymer was added.

These yarns were made into a brush in the same manner as in Example 1.

Table 2 shows the grinding ability for stainless steel plates. The elastomeric block copolymer used was styrene/
Ptagene = 40/60 (parts by weight) 200oo, 50
The material is Thermolastic (trade name, manufactured by Shell) and has a melt index of 1.0 under the condition of 0.0000 m.

As shown in Table 2, the brush made of the abrasive thread produced from the composition of the present invention has significantly improved grinding power compared to Comparative Example 1.

- Example 3 To 10 parts by weight of 0.6 polyethylene terephthalate of $p/e (1 tapolymer/100 0-chlorophenol liquid), 1 part by weight of elastomeric block copolymer and carbide siliceous abrasive grains. Add 19 parts by weight of #180 and mix well.

This mixture was melted at 300 pm using a melt extruder, extruded into water through a paper thread nozzle, and stretched 5 times to a diameter of 1
．． A 0 skin/skin monofilament was produced.

On the other hand, as a comparative example, a monofilament was produced under exactly the same conditions except that no elastomeric block polymer was added. These threads were made into a brush in the same manner as in Example 1.

Table 3 shows the grinding ability for stainless steel plates. As shown in the results in Table 3, it can be seen that the brush made of the abrasive thread produced using the composition of the present invention has significantly improved grinding power compared to the comparative example.

The elastomeric block copolymer used had a composition of styrene/butadiene = 30/70 (parts by weight), and 200
Solprene 411 (manufactured by Philips, trade name) exhibits a melt index of 0.05 at 500 °C and 500 °C.

Claims (1)

[Claims] 1 (1) Thermoplastic polymer. (2) 0.01-20 parts by weight of an elastomeric block copolymer per 100 parts by weight of the thermoplastic polymer. (3) A thermoplastic composition for grinding comprising grinding abrasive grains. 2. In claim 1, the thermoplastic polymer is nylon 6, nylon 6-6, nylon 6-10, nylon 6-12, nylon 11, nylon 12, copolymerized nylon containing these, polyethylene terephthalate. A thermoplastic composition for grinding, which is a thermoplastic polymer selected from polybutylene terephthalate, polybutylene terephthalate, and copolyester containing these. 3 In claim 1, the elastomeric block copolymer is 1,3-butadiene, isoprene, piperylene, methylbutadiene, phenylbutadiene, 3
・Heterocycle containing a component of a conjugated diene selected from 4-dimethyl-1,3-hexadiene, 4,5-diethyl-1,3-octadiene, chloroprene, and fluoroprene and a monovinyl-substituted aromatic hydrocarbon or pyridine derivative A thermoplastic composition for grinding, consisting of a copolymer of nitrogen-containing monomers. 4. The thermoplastic composition for grinding according to claim 3, wherein the monovinyl-substituted aromatic hydrocarbon is a monovinyl-substituted aromatic hydrocarbon selected from styrene, vinyltoluene paramethoxystyrene, and vinylnaphthalene. 5 In claim 3, the heterocyclic nitrogen-containing monomer including pyridine and derivatives is 2-vinylpyridine,
Heterocyclic nitrogen-containing monomer selected from 3-vinylpyridine, 4-vinylpyridine, 3-ethyl-5-vinylpyridine, 2-methyl-5-vinylpyridine, 3,5-diethyl-4-vinylpyridine A thermoplastic composition for grinding. 6. The thermoplastic composition for grinding according to claim 1, wherein the grinding abrasive grains are an artificial grinding material selected from fused alumina, silicon carbide, zirconia, carbide, nitride, boride, and glass artificial diamond. thing. 7. The thermoplastic composition for grinding according to claim 1, wherein the abrasive grains are a natural abrasive selected from diamond, corundum, emery, and garnet soft stone.