JPS62256859A - Polycarbonate composition - Google Patents

Abstract

PURPOSE:To improve chemical resistance, by blending a polycarbonate resin with a nylon resin and a silane coupling agent having an epoxy or isocyanate group. CONSTITUTION:A polycarbonate resin (A) is mixed with a nylon resin (B) (e.g., nylon 6 or nylon 12) and a silane coupling agent (C) having an epoxy or isocyanate group to obtain the desired polycarbonate compsn. 100pts.wt. component A is blended with 1-200pts.wt. component B and 0.01-5pts.wt. component C. Examples of the component C are gamma-glycidoxypropyltrimethoxysilane, gamma- isocyanatopropyltriethoxysilane, etc. The polycarbonate has excellent mechanical strength and chemical resistance and is suitable for use in the field of materials which are brought into contact with water.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a polycarbonate composition with excellent chemical resistance.

[Conventional technology]

Polycarbonate resin has excellent heat resistance and impact resistance, and is widely used in fields such as various machinery parts such as office equipment and automobile exterior parts such as bumpers, but its poor chemical resistance limits its use. There is.

To improve this, attempts have been made to blend polyester resins such as polyethylene terephthalate and polybutylene terephthalate, or polyolefins such as polyethylene into polycarbonate, but the effects of improving chemical resistance and heat resistance are not sufficient. On the other hand, attempts have been made to improve polycarbonate by blending nylon resin with it (Japanese Patent Application Laid-open No.
/4L, It) Uri issue, JP-A-59-4 r j t
J' publication). However, when nylon resin is blended with polycarbonate resin, the polycarbonate resin generally decomposes, the molecular weight of the polycarbonate decreases significantly, and the strength decreases, so that it is currently impossible to obtain a product that can withstand practical use.

[Purpose of the invention]

The present inventors conducted an investigation in order to obtain a polycarbonate with a small decrease in molecular weight of polycarbonate even when a nylon resin is blended with the polycarbonate resin, and therefore has excellent mechanical strength and chemical resistance.As a result, a certain specific compound By simultaneously blending the following, a composition that meets the purpose was found and the present invention was achieved.

That is, a polycarbonate composition characterized by blending a nylon resin and a silane coupling agent containing an epoxy group or an isocyanate group with a polycarbonate resin has been found.

[Structure of the invention]

The polycarbonate resin used in the present invention is a polymer or copolymer obtained by a phosgene method in which various dihydroxydiaryl compounds are reacted with phosgene, or a transesterification method in which a dihydroxydiaryl compound is reacted with a carbonate ester such as diphenyl carbonate. It is a combination, and representative examples include ko, 2-bis (Hiro-bis).
Examples include polycarbonate resins made from hydroxyphenyl)propane (bisphenol A).

In addition to bisphenol A, the dihydroxydiaryl compounds include bis(≠-hydroxyphenyl)methane, /,/-bis(4=-hydroxyphenyl)ethane,
, 2,2-bis(4L-hydroxyphenyl)butane,
Co, Corbis(couhydroxyphenyl)octane, Bis(≠-hydroxyphenyl)phenylmethane, Co, 2
-bis(ILL-hydroxy-3-methylphenyl)propane, /,/-bis(Hiro-hydroxy-3-tert-butylphenyl)propane, co,2-bis(4L-hydroxy-3-bromophenyl)furopane, 2 , -bis(hydroxy-3,!dibromophenyl)propane, -bis(hydroxyaryl)alkanes of co,λ-bis(4A-hydroxy-3,jdichlorophenyl)propane, /, /-bis( ≠-hydroxyphenyl) cyclopentane, /, /-bis(Hiro-hydroxyphenyl)
Bis(hydroxyaryl)cycloalkanes such as cyclohexane, ≠, 4LI-dihydroxyphenyl ether, ≠, dihydroxydiarylethers such as 4L/-dihydroxy-3,3'-dimethyldiphenyl ether, ≠, 1I -'-dihydroxydiphenyl sulfide, Hiroshi, 4A'-dihydrox7-3.3'-
Dihydroxydiaryl sulfides such as dimethyl diphenyl sulfide, ≠, 3'-dihydroxydiphenyl sulfoxide, ≠'-dihydroxy-3,3'
- dihydroxydiaryl sulfoxides such as dimethyl diphenyl sulfoxide, Hiroshi, 4t'-dihydroxydiphenyl sulfone, ≠, ≠'-dihydroxy-3,
Examples include dihydroxydiarylsulfones such as 3'-dimethyldiphenylsulfone.

These can be used alone or in a mixture of two or more,
In addition to these, piperazine, dipiperidyl, hydroquinone, resorcinol, 4L, ≠'-dihydroxydiphenyl, etc. may be mixed at equal humidity and used.

In addition, the nylon used in the present invention includes 3
Polyamides obtained by polycondensation of lactams having more than one ring member, polymerizable ω-amino acids, dibasic acids, and diamines can be used. Specifically, polymers such as ε-caprolactam, aminocaproic acid, enantholactam, 7-aminohbutanoic acid, //-aminoundecanoic acid, teraminononanoic acid, α-pyrrolidone, α-piperidone, hexamethylene diamine, Polycondensation of diamines such as nonamethylenecyamine, undecamethylene diamine, dodecamethylene diamine, and metaxylylene diamine with dicarboxylic acids such as terephthalic acid, isophthalic acid, adipic acid, cepatic acid, dodecane dibasic acid, and geltaric acid. The resulting polymers or copolymers thereof, e.g.
Nylon Hiromu, Otsu, 7! , //, /, 2, Otsu 1g%g,
9, g, 10, Otsu, //, Otsu, /2, tT, t/l,
Otsu, 741% 6e/≦T can be cited for 6//-1.

Among these, polyamide-forming components consisting of aliphatic diamine and isophthalic acid and/or terephthalic acid are j0~
A 100-layer nylon resin is preferred because it has good compatibility with polycarbonate, transparency, and dimensional stability.

The blend of nylon Tlyi fat is polycarbonate 10
1 to -〇〇 for 0 parts by weight? parts, preferably 2~/
! It is an important part of Q, and if the amount is small, the effect of improving chemical resistance will be small, and if it is too much, the thermal stability will be poor and the strength will be low.

As the epoxy group- or isocyanate group-containing silane coupling agent, various well-known silane coupling agents can be used. are the same or different hydroxyl groups, alkoxy groups,
Indicates a hydrolyzable group such as a halogen baby. n is /, λ,
A silane coupling agent represented by the formula (an integer of 3) is particularly suitable. Specifically, epoxy-based silane coupling agents such as γ-glycidoxypropyltrimethoxysilane and β-(3,4L-epoxycyclohexyl)ethyltrimethoxysilane, and isocyanate-based silanes such as γ-isocyanatepropyltriethoxysilane. Mention may be made of coupling agents. Of course, these 7-run coupling agents can also be used as a mixture of AA1 or higher.The compounding amount is 0.01 parts by weight per 100 parts by weight of polycarbonate resin.
~! Parts by weight, more preferably 0.02 to 3 parts by weight, are preferable since the molecular weight decreases less.

The nylon resin and the 7-run coupling agent can be blended into the polycarbonate resin at any stage up to just before molding the final molded product by any known means. The simplest method is to tri-blend polycarbonate and additives, but this tri-blend may be melt mixed and extruded to form pellets.

Alternatively, a master pellet containing a predetermined amount or more of the additive may be prepared, and this may be blended with the polycarbonate for dilution.

To obtain the final molded product, the blend or pellets described above may be fed to various molding machines such as injection, extrusion, blow, and compression, and molded according to conventional methods, but in some cases, additives may be added to the molding machine. It can also be done by machine.

In addition to the above-mentioned formulations, the composition of the present invention may also contain various well-known additives, such as glass fiber, carbon nitride, reinforcing agents such as metal whiskers, silica, alumina, silica-alumina clay minerals, and silica-alumina clay minerals. It may contain fillers such as magnesium clay minerals, calcium silicate, calcium carbonate, asbestos, and carbon black, as well as other lubricants, nucleating agents, antioxidants, flame retardants, antistatic agents, weathering agents, and the like.

〔Example〕

EXAMPLES The present invention will be explained in more detail below with reference to Examples, but the present invention is not limited to these Examples.

The measurement items in the examples were carried out by the following methods.

(1) Nylon ηrel J engineering 5K-617
Measurement was made using an Ostwald viscosity tube in accordance with 0.0.

(2) T7 (glass transition temperature) differential scanning heat fk
Measurements were taken.

(3) Polycarbonate molecular weight device: Toyo Soda)! LC/θcoUR column: Toyo Soda asoooH, G Hirooo.

The solution was measured with tetrahydrofuran using H4, (J3000H4, (J2000H6, (Hiromoto Column)) to measure the number average molecular weight.

(4) Tensile strength, elongation AEITM D≦3? ASTM D-264 was used using a 771 inch thick specimen.

(6) Gasoline resistance test Tensile test piece has 0. ! A bending strain of 1 was applied, and after immersing in gasoline for 5 minutes, it was air-dried for 2 hours. A tensile test was performed using the test piece to determine the elongation.

[Production example of aromatic nylon]

Distilled water s3 and 9 hexamethylenediamine aqueous solution (/θ
wt%)/3. Add Rimisaki, isophthalic acid, /ji, terephthalic acid, 9 cod, stir and dissolve evenly in the tank, and then add acetic acid! After adding 39, put it into an autoclave. 2. sI6/
Water is distilled out while maintaining the internal pressure of /- until the concentration of nylon salt reaches 0 weight, and then /3 kg/ctd.
After increasing the pressure to
After vacuum polymerization was carried out at a reduced pressure of rr for 7 hours, the product was extruded into chips. The polymer thus obtained is ηre
l 2.2.71127°C.

Examples/~3, Comparative Examples/~100 parts by weight of Hirobunshi-FJ2JOOOO bisphenol A type polycarbonate were blended with the above-mentioned aromatic nylon resin and silane coupling agent after drying as shown in Table-/, 2 with coaxial vent extruder manufactured by Nakatani Machinery
? The mixture was kneaded and pelletized at θ°C. The pellets were dried with hot air and then molded using a 3.6 oz injection molding machine (Toshiba Machine L57JS) at a temperature of 300°C and a mold temperature of ? Samples for physical property tests were prepared at θ°C. Using this, normal tensile test,
d @ strike was measured. We also checked gasoline resistance. In order to determine the degree of molecular weight reduction of the polycarbonate resin, the molded product was crushed and then subjected to reflux extraction with methylene chloride to extract the polycarbonate. The molecular weight of the extracted polycarbonate was measured using GPO.

For comparison, an epoxy compound and an isocyanate compound were mixed and the same procedure was carried out in the case of fc. Note that all of these molded products were transparent.

〔Effect of the invention〕

As shown in Table 2, the resin composition obtained according to the present invention has extremely excellent chemical resistance, and its commercial use value is extremely high.

Sender: Mitsubishi Chemical Industries, Ltd. Representative Patent Attorney Tayayo - Others/Names

Claims (3)

[Claims] (1) A polycarbonate composition comprising a polycarbonate resin, a nylon resin, and a silane coupling agent containing an epoxy group or an isocyanate group. (2) 100 parts by weight of polycarbonate resin, 1 to 200 parts by weight of nylon resin, and 0.0 parts by weight of silane coupling agent
Polycarbonate composition according to claim 1, characterized in that it consists of 1 to 5 parts by weight. (3) The polycarbonate composition according to claim 1 or 2, wherein the nylon resin contains 50 to 100% by weight of a polyamide forming component consisting of an aliphatic diamine and isophthalic acid and/or terephthalic acid. thing.