JPH04108855A - Plastic composition and its use - Google Patents

Abstract

PURPOSE:To obtain a plastic composition, excellent in heat, chemical resistance, etc., and utilized as members of radiator tanks or those around water by blending a specific polyamide resin with a specified polyolefin resin composition and an inorganic filler in specific amounts. CONSTITUTION:A plastic composition is obtained by blending 100 pts.wt. total amount of (A) 60-99wt.% polyamide resin, composed of dicarboxylic acid component units composed of terephthalic acid units and other aromatic dicarboxylic acid units or terephthalic acid units and 4-20C aliphatic dicarboxylic acid units and diamine component units composed of diamine units having 4-25C alkylene groups and having 0.5-3dl/g intrinsic viscosity and 70-150 deg.C glass transition temperature and (B) 1-40wt.% composition composed of (B1) a modified crystalline polyolefin modified with a compound selected from carboxylic acids, etc., (B2) a modified flexible polymer modified with a compound selected from the carboxylic acids, etc., and/or (B3) a crystalline polyolefin with (C) 0.5-150 pts.wt. inorganic filter.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field of the Invention The present invention relates to plastic compositions and uses thereof;
More specifically, the present invention relates to a plastic composition particularly excellent in heat resistance and chemical resistance, and a radiator tank or water-related member made of this plastic composition.

Technical background of the invention and its problems In general, polycaprolactam (6-nylon), polyhexamethylene adipamide (6,6-nylon), polyhexamethylene azerai 1-(8,9-nylon), Aliphatic polyamides such as polyhexamethylene sebaamide (6,10-nylon), polyhexamethylene dodecanoamide (8,12-nylon), and polylauric lactam (12-nylon) are polyolefins. It has superior strength, rigidity, heat resistance, and abrasion resistance compared to thermoplastic resins such as typified by thermoplastic resins, and is widely used as an engineering plastic for various molding applications.

However, in order to use aliphatic polyamides such as those mentioned above in the field of engineering plastics, which require even higher performance, they must have heat resistance properties such as melting point, glass transition point, and heat distortion temperature, as well as stiffness, tensile strength, and bending strength. Mechanical properties such as water resistance, boiling water resistance, salt water resistance, and chemical resistance are insufficient. For this reason,
Its use was limited.

Therefore, other resins are inevitably used for applications where aliphatic polyamides cannot be used.

Engineering plastics with excellent heat resistance, mechanical properties, and physical and chemical properties include, for example, PPS (polyphenylene sulfide resin) and PE.
S (polyether sulfone), PEEK (polyether ether ketone), PSF (polysulfone), P
EI (polyetherimide) etc. are used,
More recently, for example, polytetrafluoroethylene (
(trade name: Teflon), polyparaphenylene terephthalimide (trade name: Kevlar), polyimide consisting of a condensate of 4.4°-diaminophenyl ether and pyromellitic anhydride (trade name: Kapton), polyphenylene sulfide, etc. It is used.

However, among these engineering plastics, polytetrafluoroethylene, polyparaphenylene terephthalamide, and the above-mentioned polyamide resins are materials with excellent heat resistance, mechanical properties, and physical and chemical properties, but they cannot be melt-molded. The problem is that it cannot be done. Also, polyphenylene sulfide,
Polyacetal has the problem of poor heat resistance properties such as melting point, glass transition point, and heat distortion temperature, and poor mechanical properties such as impact strength and abrasion resistance.

By the way, from the viewpoint of energy saving through weight reduction, plastics, which are lighter and have better moldability than metal materials, are being widely used as automobile parts. A wide range of automobile parts are molded from these plastics, such as bumpers, car body outer panels, and tanks, and the characteristics required for each part are also very different.

Cooling water storage tanks for automobile radiators (hereinafter referred to as automobile radiator tanks), which are one of these automobile parts, are not only water resistant, but also have excellent heat resistance and chemical resistance, as well as excellent mechanical properties. It is required to have a strong objective.

In other words, the engine cooling water that returns from the engine's water jacket can rise to over 80 degrees Celsius depending on the usage environment, and since the radiator is usually installed near the engine in the engine room, it can become hot at high temperatures. Rigidity is required.

Moreover, since the cooling water returned at high temperature and the cooling water left to cool down to low temperature coexist in the automobile radiator tank, it is desired that the coefficient of thermal expansion has little variation at any temperature.

In recent years, it has also been used as engine cooling water to prevent freezing.
Antifreeze such as polyethylene glycol aqueous solution (long,
Radiator tank (life coolant) is widely used, but if it is used for a long time while containing this antifreeze, there is a problem that the mechanical strength of the radiator tank decreases.

Furthermore, in cold regions, calcium chloride, which is sprayed on roads as an antifreeze agent, causes stress cracks in radiator tanks.

It is also necessary to have excellent chemical resistance against antifreeze and road antifreeze agents.

However, for automobile radiator tanks that require such high performance, none of the above-mentioned conventional materials have been able to satisfy the requirements. There was still room for improvement in this respect.

Purpose of the Invention The present invention attempts to solve the problems associated with the prior art as described above, and aims to improve heat resistance properties such as melting point, glass transition point, and heat distortion temperature, tensile strength, bending strength, and durability. Mechanical properties such as impact strength, physical and chemical properties such as water resistance, boiling water resistance, salt water resistance, saturated water absorption, chemical resistance, fluidity of melt molded products, melt compression moldability, melt injection moldability, The object of the present invention is to provide a plastic composition that has excellent molding properties such as melt extrusion moldability, particularly excellent heat resistance properties and chemical resistance, and uses thereof.

Summary of the Invention The plastic composition according to the present invention includes the following polyamide resin [A]: 60-99% by weight, polyolefin resin composition [B]: 1-40f! Inorganic filler [C]: 0.5 to 150 parts by weight per 100 parts by weight of [A] and [B].

That is, in the polyamide resin [A], the dicarboxylic acid component units constituting the polyamide resin [A] are terephthalic acid component units = 60 to 100 mol%, preferably 70 to 80 mol%, and an aromatic group other than terephthalic acid. Dicarboxylic acid component unit: 0~
40 mol%, preferably 20 to 30 mol% [However, the total of all dicarboxylic acid component units is 100 mol%. ] Alternatively, 230 to 100 mol% of terephthalic acid component units, preferably 40 to 70 mol%, and 20 to 70 mol% of aliphatic dicarboxylic acid component units having 4 to 20 carbon atoms, preferably 30 to 60 mol% [however, total The amount of dicarboxylic acid component units is 100 mol%. ], the diamine component unit is a diamine component unit having an alkylene group having 4 to 25 carbon atoms, and the intrinsic viscosity [η] of the polyamide resin [A] measured in concentrated sulfuric acid at 30°C is 0.5-3. Od, l)/g, and the glass transition temperature [Tgl is 70 to 150°C.

In addition, the polyolefin resin composition [B] can be used in the following blending amounts of (1) alone, (1) and (11), (1) and (ii).
i) or a combination of (i).

(i) Modified crystalline polyolefin modified with at least one compound selected from carboxylic acids, carboxylic acid metal salts, carboxylic esters, and acid anhydrides, 50 to 10
0% by weight (11) 20 to 50% by weight of a modified flexible polymer modified with at least one compound selected from carboxylic acid, carboxylic acid metal salt, carboxylic acid ester, and acid anhydride (iii) Crystalline polyolefin : 0 to 50 ffl amount % In addition, the composition [in B, (i) alone, (i) and (ii),
(i) and (iii) or (i) and (ii)
In any combination of and (ii>), the total amount of
The sum π°1 is 100% by weight.

The radiator tank and water parts according to the present invention are made of the above-mentioned plastic composition.

Since the plastic composition according to the present invention is composed of the above-mentioned specific components, it has excellent heat resistance, mechanical properties, physicochemical properties, molding properties, etc., and especially excellent heat resistance properties and chemical resistance. ing.

Since the radiator tank and water parts according to the present invention are made of the above-mentioned plastic composition,
The excellent properties of the above composition can be exhibited.

Detailed Description of the Invention The plastic composition according to the present invention will be specifically described below.

The plastic composition of the present invention basically comprises a polyamide resin [A], a polyolefin resin [B], an inorganic filler [
C].

The polyamide resin [A] used in the present invention is composed of repeating units consisting of a specific dicarboxylic acid component unit (1) as described below and a specific aliphatic diamine component unit (2) as described below. There is.

The dicarboxylic acid component unit (1) contains a terephthalic acid component unit as an essential component. In addition, dicarboxylic acid component units (
1) may contain other dicarboxylic acid component units in addition to the terephthalic acid component units.

Examples of carboxylic acid component units other than terephthalic acid component units include aromatic dicarboxylic acid component units other than terephthalic acid component units and aliphatic dicarboxylic acid component units.

Examples of aromatic dicarboxylic acid component units other than terephthalic acid include component units derived from isophthalic acid, 2-methylterephthalic acid, and naphthalene dicarboxylic acid. When the polyamide resin [A] contains aromatic dicarboxylic acid component units other than terephthalic acid component units, isophthalic acid component units are particularly preferred as such component units.

The aliphatic dicarboxylic acid component unit has 4 to 20 carbon atoms.
, preferably derived from aliphatic dicarboxylic acids having 6 to 12 alkylene groups.

Examples of aliphatic dicarboxylic acids used to derive such aliphatic dicarboxylic acid component units include succinic acid, adipic acid, azelaic acid, and sebacic acid. When the polyamide resin [A] used in the present invention contains an aliphatic dicarboxylic acid component unit, an adipic acid component unit is particularly preferred as such a component unit.

Along with the dicarboxylic acid component unit (1) as described above, the diamine component unit (2) constituting the polyamide resin used in the present invention is derived from a diamine having an aliphatic alkylene group having 4 to 25 carbon atoms. It is a component unit.

Specific examples of such aliphatic alkylene diamines include linear 1,4-diaminobutane, 1,6-diamithexane, 7-diaminohbutane, 1,8-diaminooctane, and 1.9-diaminohexane. -Diaminononane, 1.10-diaminodecane, 1. II-diaminoundecane, 1.12
Mention may be made of diaminododecane and branched linear trimethyl-1,6-diamithexane.

Particularly in the present invention, the diamine component unit is preferably a component unit derived from a linear aliphatic alkylene diamine. Such linear aliphatic alkylene diamines are preferably 1,6-diamithexane, 1,8-diaminooctane, 1,1,0-diaminodecane, 1,12-diaminododecane, and mixtures thereof. used. Further, among these, 1,6-diamithexane is particularly preferably used.

Intrinsic viscosity of polyamide resin [A] used in the present invention [
η] is 0.5 to 3. Od1/g, preferably 0.8~
It is 1.5 dN/g. When the intrinsic viscosity [η] is 0.5 or more, the mechanical properties are excellent, and when the intrinsic viscosity [η] is 3.0697 g or less, the forming properties are excellent.

The glass transition temperature [Tgl of the polyamide resin [A] is 7
The temperature is 0 to 150°C, preferably 80 to 130°C. When the glass transition temperature [Tgl] is 70°C or higher, the heat resistance properties are excellent, and when the glass transition temperature [Tgl] is 150'C or lower, the forming properties are excellent.

The polyamide resin [A] used in the present invention contains terephthalic acid component units in an amount of 60 to 100 mol% in 100 mol% of all dicarboxylic acid component units, and aromatic dicarboxylic acid component units other than terephthalic acid in an amount of 0 to 100 mol%. 40 mol% of repeating units, or 30 to 100 mol% of terephthalic acid component units and 0 to 70 mol% of aliphatic dicarboxylic acid component units. ing.

The polyolefin resin composition [B] includes (i) a modified crystalline polyolefin and a modified soft polymer, (ii) a modified crystalline polyolefin and a crystalline polyolefin, or (iii) a modified crystalline polyolefin, a modified soft polymer, and a crystalline polyolefin. consisting of any combination of polyolefins. This polyolefin resin composite acid [B] contains 50 to 100% by weight of the modified crystalline polyolefin, preferably 70 to 10% by weight of the resin composition [83,100% by weight].
In an amount of 0% by weight, the modified flexible polymer is present in an amount of 0 to 50% by weight, preferably 0 to 30% by weight, and the crystalline polyolefin is included in an amount of 0 to 50% by weight, preferably 0 to 20% by weight. It is. In this polyolefin resin [B],
When the modified soft polymer and the crystalline polyolefin are within the above ranges, the resulting plastic composition tends to have improved mechanical properties.

The above-mentioned modified crystalline polyolefin contained in this polyolefin resin composition [B] is a crystalline polyolefin made of at least one compound (modifier) selected from carboxylic acids, carboxylic acid metal salts, carboxylic acid esters, and acid anhydrides. It has been denatured.

Examples of carboxylic acids include acetic acid, acrylic acid, methacrylic acid, fumaric acid, itaconic acid, etc.
Examples of carboxylic acid metal salts include thorium salts, calcium salts, magnesium salts, and zinc salts of carboxylic acids, and examples of carboxylic acid esters include methyl esters, ethyl esters, propyl esters, and carboxylic acid esters. Examples of the acid anhydride include butyl ester and vinyl ester, and maleic anhydride. Further, examples of the crystalline polyolefin modified by such a modifier include polyethylene, polypropylene, polybutene, and the like. The crystallinity of these polyolefins is usually
It is 10% or more, preferably 30 to 80%. In the present invention, these modified crystalline polyolefins may be used alone or in combination of two or more.

The degree of polymerization of the modified crystalline polyolefin used in the present invention is not particularly limited, and usually has a melt index of 0.
Modified crystalline polyolefins within the range of 0.01 to 1.00 g/10 min can be arbitrarily selected.

The above-mentioned modified crystalline polyolefin can be produced according to known methods such as the Parater modification method and the melt modification method.

The polyolefin resin composition [B] contains a modified soft polymer, and when forming this modified soft polymer, the same modifier as that used when forming the above-mentioned modified crystalline polyolefin is used. Modifiers are used. In addition, soft polymers modified with such modifiers include (a)
α-olefin copolymer, (b) α-olefin/diene copolymer, (c) aromatic vinyl hydrocarbon/conjugated diene random copolymer, aromatic vinyl hydrocarbon/conjugated diene block copolymer Examples include combinations or hydrides thereof.

As the α-olefin copolymer (a), a non-quality or low-crystalline copolymer formed from at least two types of α-olefins (including ethylene) is used.

Specifically]) ethylene/α-olefin (α-olefin does not include ethylene. The same shall apply hereinafter) copolymer, (i
i) A propylene/α-olefin (α-olefin in this case does not include propylene; the same applies hereinafter) copolymer is used.

The α-olefin used in constructing the ethylene/α-olefin copolymer (i) is usually an α-olefin having 3 to 20 carbon atoms, such as propylene, 1
-butene, ■-pentene, ■-hexene, 4-methyl-
Examples include 1-pentene, -octene, -decene, and mixtures thereof. Among these, α-olefins having 3 to 1° of carbon atoms are particularly preferred.

In addition, propylene/α-olefin copolymer (ii)
Among the above-mentioned α-olefins, the α-olefin used in forming the
20 α-olefins can be exemplified. Among these, α-olefins having 4 to 10 carbon atoms are particularly preferred.

Ethylene/α-olefin copolymer (i) as described above
The molar ratio of ethylene component units to α-olefin component units (ethylene/α-olefin) varies depending on the type of α-olefin used, but is generally preferably from 30/70 to 9515.

In addition, propylene/α-olefin copolymer (IT)
The molar ratio of propylene component units to α-olefin component units (propylene/α-olefin) varies depending on the type of α-olefin used, but is generally preferably 30/70 to 9515.

Specifically, as the α-olefin/diene copolymer (b), (tii) ethylene/α-olefin/diene copolymer and (IV) propylene/α-olefin/diene copolymer are used. .

Ethylene/α-olefin/diene copolymer (iii
) as the α-olefin used in constructing the
As mentioned above, α-olefins having 3 to 20 carbon atoms can be exemplified. Of these, especially 3 to 1 carbon atoms
0 α-olefins are preferred.

In addition, propylene/α-olefin/diene copolymer N
Among the α-olefins mentioned above, the α-olefin used in constructing Y) has 4 to 4 carbon atoms.
20 α-olefins can be exemplified. Among these, α-olefins having 4 to 10 carbon atoms are particularly preferred.

Ethylene/α-olefin/diene copolymer (iii
) or the diene used when constructing the propylene/α-olefin/diene copolymer (1v):
1. Chained non-conjugated dienes such as 4-hexadiene, ■, 6-octadiene, 2-methyl-1,5-hexadiene, 6-methyl-15-hebutadiene, 7-methyl-■, 6-octadiene , cyclohexadiene, dicyclopentadiene, methyltetrahydroindene, 5-vinylnorbornene, 5-ethylidene-2-norbornene, 5-methylene-2-norbornene, 5-itupropylidene-2
- cyclic non-conjugated dienes such as norbornene, 6-chloromethyl-5-isopropenyl-2-norbornene, 2,
3-diisopropylidene-5-norbornene, 2-ethylidene-3-isopropylidene-5-norbornene, 2-
Examples include propenyl-2,2-norbornadiene.

In the above-mentioned ethylene/α-olefin/diene copolymer (iii), the molar ratio of ethylene component units to α-olefin component units (ethylene/α-olefin) varies depending on the type of α-olefin used. Although it varies, it is generally preferable that it is 30/70 to 9515.

The content of diene component units in this copolymer (iii) is preferably 1 to 20 mol%, preferably 2 to 15 mol%.

Propylene/α-olefin/diene copolymer (1v)
The molar ratio of propylene component units to α-olefin component units (propylene/α-olefin) varies depending on the type of α-olefin used, but is generally preferably from 30/70 to 9515.

Further, the content of diene component units in this copolymer (1) is 1 to 20 mol%, preferably 2 to 15 mol%.
It is desirable that

As the aromatic vinyl hydrocarbon/conjugated diene random or block copolymer or its hydride (c),
Specifically, (V) styrene/butadiene block copolymer, (vl) styrene/butadiene/styrene block copolymer, (Vtt) styrene/isoprene block copolymer, (Viii) styrene/isoprene/styrene block. copolymer, (jX) hydrogenated styrene/butadiene/styrene block copolymer, (X) hydrogenated styrene/isoprene/styrene block copolymer, (
, H) Styrene-butadiene random copolymer, etc. are used.

In these copolymer rubbers, the molar ratio of aromatic vinyl hydrocarbon component units to conjugated diene component units (aromatic vinyl hydrocarbon/conjugated diene) is 10/90 to 70.
/30 is preferable.

Hydrogenated styrene/butadiene/styrene block copolymer (iX) is a copolymer obtained by hydrogenating some or all of the double bonds remaining in the above styrene/butadiene/styrene block copolymer (Vi). It is a combination.

Further, the hydrogenated styrene/isoprene/styrene block copolymer (X) is obtained by hydrogenating some or all of the double bonds remaining in the above styrene/isoprene/styrene block copolymer (viii). It is a copolymer.

The above-mentioned (i) to (X
Component i) has a glass transition temperature (Tg) of 0°C or lower, preferably -10°C or lower, more preferably -20°C or lower, and has an intrinsic viscosity measured in decalin at 135°C [
η] is 0.01 to 10 dΩ/g, preferably 0.08 to
7 dρ/g, and the degree of crystallinity measured by X-ray diffraction is preferably in the range of 0 to 10%, preferably 0 to 7%, particularly preferably 0 to 5%.

The soft copolymer components (i) to (Xi) as described above may be used alone or in combination of two or more.

Examples of the crystalline polyolefin constituting the polyolefin resin composition [B] include polyethylene, polypropylene, polybutene, and the like. Note that this crystalline polyolefin may be used alone or in combination of two or more types. At this time, the molecular weight of the crystalline polyolefin is
Although not particularly limited, MFR is generally 0.01 to 10
A polyolefin of 0 g/10 min is preferably used.

In addition, its crystallinity is 10% or more, preferably 30 to 8
It is 0%.

In the present invention, the polyolefin resin composition [B] consists of a modified crystalline polyolefin, a modified soft polymer and/or a crystalline polyolefin as described above, but this composition [B] consists of the polyamide resin [ A]
It is used in amounts of 1 to 40% by weight relative to 60 to 99% by weight. However, the total of [A] and [B] is 100% by weight.

If the blending ratio of composition [B] is less than 1% by weight, the hygroscopicity of the resulting plastic composition tends to decrease, and if it exceeds 40% by weight, the mechanical properties and heat resistance properties tend to decrease. .

The plastic composition according to the present invention has an inorganic filler [C]
is blended.

Examples of the filler [C] include various fillers having a powder, granule, plate, fiber, needle, cross, and mat shape, and specifically, silica, alumina, Silica alumina, talc, diatomaceous earth, clay, kaolin, glass, mica, graphite, molybdenum disulfide,
Powdered or plate-like inorganic compounds such as Ceracola, red iron, titanium dioxide, zinc oxide, aluminum, copper, stainless steel, glass fiber, carbon fiber, boron fiber, ceramic fiber, asbestos fiber, stainless steel fiber, wollastonite, titanium Examples include fibrous inorganic compounds such as acid potassium, and secondary processed products such as cloth-like products thereof.

These fillers may be used alone or in combination of two or more. Further, these fillers can also be used after being treated with a silane coupling agent or a titanium coupling agent.

Among the fillers described above, specific examples of the powder filler include silica, alumina, silica alumina, titanium dioxide, graphite, and molybdenum disulfide.

The average particle size of the powdered filler as described above is usually 0.1~
It is preferably 200 μm, preferably in the range of 1 to 100 μm. It is preferable that the average particle size is within this range because the abrasion resistance of the resulting plastic composition is significantly improved.

Further, among the above-mentioned fillers, specific examples of the inorganic fibrous filler include glass fiber, carbon fiber, and boron fiber. The use of such fibers improves the mechanical properties such as tensile strength, flexural strength, and flexural modulus of molded objects obtained from plastic compositions;
This is preferable because heat resistance properties such as heat distortion temperature and physical and chemical properties such as water resistance are improved.

The average length of the above-mentioned inorganic fibrous filler is usually 0.
．． It is desirable that the thickness be in the range of 1 to 20 mm, preferably 0.3 to 6 mm. When the average length of the fibrous filler is within this range, the moldability of the plastic composition is improved, and the heat resistance properties such as heat denaturation temperature, tensile strength, bending strength, etc. of the molded article made of this plastic composition are improved. This is preferable because it improves the mechanical properties and the like.

These fillers [C] are used in an amount of 05 to 150 parts by weight based on a total of 100 parts by weight of the polyamide resin [A] and the polyolefin resin composition [B]. If the amount of filler blended is less than 0.5 parts by weight, the effect tends not to be exhibited, and if it exceeds 150 parts by weight, moldability tends to decrease.

In particular, in the case of a powder filler, the above-mentioned polyamide resin [A] and the above-mentioned polyolefin resin composition [
B] is contained in an amount of 150 parts by weight or less, preferably 80 parts by weight or less, particularly preferably 30 parts by weight or less, based on 100 parts by weight in total.

Moreover, by making the amount of the filler blended 0.5 parts by weight or more, the effect of the filler blend can be exhibited.

In addition, in the case of an inorganic fibrous filler, the total amount of polyamide resin [A] and polyolefin resin composition [B] is 1
00 parts by weight, the amount is 150 parts by weight or less, preferably 5 to 130 parts by weight, more preferably 5 to 1 parts by weight.
Preferably, it is included in the plastic composition of the present invention in an amount of 0.00 parts by weight.

Furthermore, by setting the amount of the fibrous filler to be 0.5 parts by weight or more, the effect of the filler can be exerted.

The plastic composition of the present invention may optionally contain an antioxidant, an infrared absorber, a photoprotectant, a heat stabilizer, a phosphite stabilizer, a peroxide decomposer, a basic adjuvant, a nucleating agent, Plasticizers, lubricants, antistatic agents, flame retardants, pigments, dyes, etc. may also be included.

Furthermore, the plastic composition of the present invention may contain other resins within a range that does not impair the excellent properties described above.

Examples of such resins include PPS (polyphenylene sulfite), PPE (polyphenyl ether)
etc., and modified products thereof.

The plastic composition according to the present invention maintains each component of the polyamide resin [A] and the polyolefin resin composition [B], that is, the modified crystalline polyolefin, the modified soft polymer, and/or the crystalline polyolefin, in a molten state. However, it can be adjusted by a method such as blending the inorganic filler [C] and, if necessary, other resins therein and kneading them. At this time, ordinary kneading equipment such as an extruder, a kneader, etc. can be used.

Using the plastic composition according to the present invention as described above, ordinary melt molding methods such as compression molding method, injection molding method,
Alternatively, by using an extrusion method or the like, radiator tanks used for various heat dissipation and cooling applications such as automobiles can be manufactured.

Furthermore, the plastic composition according to the present invention can be used not only for the above-mentioned radiator tank but also as a plumbing member provided around the radiator tank.

Examples of water-related members include a pump impeller, a pump head cover, a flange, and a pump casing.

Such water components can be manufactured using the same method as the radiator tank described above.

In addition to the above-mentioned uses, the plastic composition according to the present invention can also be used in various uses such as engineering plastics by ordinary molding methods. For example, it can be used as a resin composition for forming a chemical pump or the like. In particular, as engineering plastics for forming molded objects that are used under severe temperature conditions where one side of the wall of the molded object is in contact with a high-temperature liquid and the other side is in contact with a low-temperature liquid or gas. It can be suitably used.

Effects of the Invention Since the plastic composition according to the present invention is composed of the specific resin composition as described above, it has excellent heat resistance properties such as melting point, glass transition point, and heat distortion temperature, tensile strength, bending strength, impact strength, dynamic friction coefficient, Mechanical properties such as taper wear, physical and chemical properties such as water resistance, boiling water resistance, salt water resistance, saturated water absorption, chemical resistance, fluidity of melt molded products, melt compression moldability, melt injection moldability, It has excellent molding properties such as melt extrusion moldability, and is especially excellent in heat resistance and chemical resistance.

Example 1 Next, the present invention will be explained in more detail with reference to Examples.
The present invention is not limited to these examples in any way as long as they do not go beyond the gist of the invention.

Granulation method: First, 35 mol% of terephthalic acid component units and 15 mol% of isophthalic acid component units [however, the total of dicarboxylic acid component units is 50 mol%. Hexamethylene diamine 5
0 mol%, and the intrinsic viscosity [η] measured in concentrated sulfuric acid at 30°C is 1. ．． 1 dB/g, and the glass transition temperature [T
A polyamide resin [A] having a temperature of 125°C was prepared.

Next, maleic anhydride was grafted onto the ethylene-propylene copolymer, and the grafting ratio was 7% by weight, and the molar ratio of ethylene component units to propylene component units (ethylene/propylene) was 81/19. , the glass transition temperature [T g] is -58°C, and 135°C
Intrinsic viscosity measured in decalin [η is 2.19 dρ/
Ethylene propylene rubber (modified with maleic acid) was prepared, having a crystallinity of 5% as measured by X-ray diffraction.

On the other hand, 0.7% by weight of maleic anhydride is grafted, the crystallinity is 40%, and the melt flow rate (MF
A modified polypropylene with R) of 9 g/10 min was prepared.

Next, the ethylene propylene rubber (maleic acid modified product) was added to this modified polypropylene at an internal weight ratio of 2.
A modified polypropylene resin composition [B] containing ethylene-propylene rubber was prepared by blending the components in an amount of 5% by weight.

Polyamide resin [A148
Parts by weight of the modified polypropylene resin composition containing ethylene/propylene rubber [8312 parts by weight] were placed in a normal vent (
= into the hopper of a shaft extruder (e.g. PCM45 from Yusho Tekko, TEX44 from Chunichi Wood Works), and then glass fiber (13 μm diameter, 3 mm length) as an inorganic filler [C] from the side feeder. 40 parts by weight of chopped strands were added and granulated at 330°C.

The obtained granules were molded into an injection molding machine (Toshiba IS-50EP).
A test piece was molded by injection molding using a cylinder temperature of 330°C and a mold temperature of 120°C. Next, various tests as described below were conducted.

The results are shown in Table 1.

Examination method [Tensile test] It was conducted according to ASTM D638.

Two types of test piece shapes ■Dumbell Test speed: 20mm/min Test temperature: 23℃ [Bending test It was performed according to ASTM D790.

Test piece shape: 5 xi/2 Xi/8' inches, distance between spans 51 mm Test speed: 20 mm/min Test temperature: 23°C [Izod impact test] Conducted according to ASTM D25B.

Test piece shape: 5/2 xi/2 xi/8 t inch (notched) Test temperature = 23°C [Heat distortion temperature (HDT)] Conducted according to ASTM 1) 648.

Test piece shape: 5 xi/4 xi/2' inch load
Weight: 264 ps+ [Water Resistance] The above tensile test piece was immersed in water at 100°C for 100 hours, and after the water absorption test, a tensile test was conducted under the above test conditions.

[LLC resistance] The above tensile test piece was heated with Nissan genuine long life coolant 5.
Immerse in 0% aqueous solution at 140°C for 400 hours. Resistant LLC
After the test, a tensile test was conducted under the above tensile test conditions.

Examples 2 to 12 The same procedures as in Example 1 were conducted except for changing the raw materials and composition ratios shown in Table 1.

Comparative Examples 1 to 5 The same procedures as in Example 1 were conducted except for changing the raw materials and composition ratios shown in Table 2.

female

Claims (2)

[Claims] (1) Polyamide resin [A]: 60 to 99% by weight, polyolefin resin composition [B]: 1 to 40% by weight, and inorganic filler with respect to a total of 100 parts by weight of [A] and [B]. [C]: 0.5 to 150 parts by weight, and the polyamide resin [A]
The dicarboxylic acid component units constituting the composition are 60 to 100 mol% of terephthalic acid component units and 0 to 40 mol% of aromatic dicarboxylic acid component units other than terephthalic acid [however, the total of all carboxylic acid component units is 100 mol% shall be. ], or 30 to 100 mol% of terephthalic acid component units and 0 to 70 mol% of aliphatic dicarboxylic acid component units having 4 to 20 carbon atoms [however, the total of all carboxylic acid component units is 100 mol%
shall be. ], the diamine component unit consists of a repeating unit consisting of a diamine component unit having an alkylene group having 4 to 25 carbon atoms, and the intrinsic viscosity [η] of the polyamide resin [A] measured in concentrated sulfuric acid at 30°C is within the range of 0.5 to 3.0 dl/g, and the glass transition temperature [Tg] is within the range of 70 to 150°C, and the polyolefin resin composition [B] contains (i) carboxylic acid, carboxylic acid, Modified crystalline polyolefin modified with at least one compound selected from acid metal salts, carboxylic acid esters, and acid anhydrides 50~
100% by weight, (ii) 0 to 50% by weight of a modified flexible polymer modified with at least one compound selected from carboxylic acids, carboxylic acid metal salts, carboxylic acid esters, and acid anhydrides, and/or ( iii) 0 to 50% by weight of crystalline polyolefin [However, modified crystalline polyolefin (i) alone, or modified crystalline polyolefin (i) and modified soft polymer (ii) and/or crystalline polyolefin in composition [B] The total amount with polyolefin (iii) is 100% by weight. ] A plastic composition characterized by comprising: (2) A radiator tank or plumbing member made of the plastic composition according to claim 1.