KR20070092870A - Transparent thermoplastic acrylonitrile-butadiene-styrene resin compositions - Google Patents

Abstract

A transparent thermoplastic acrylonitrile-butadiene-styrene resin composition is provided to be superior in transparency and heat stability, suppress the formation of gas, and provide a clear surface without forming any die precipitate. A transparent thermoplastic acrylonitrile-butadiene-styrene resin composition comprises a transparent acrylonitrile-butadiene-styrene resin and a polysulfide. The polysulfide has a structure represented by the following formula: R1-[S]n-R2, wherein R1 and R2 are an alkyl group having 9-12 carbon atoms and n is an integer of 3 or 5. The polysulfide is contained in an amount of 0.01-3 parts by weight based on 100 parts by weight of the transparent acrylonitrile-butadiene-styrene resin.

Description

Transparent ABS type thermoplastic resin composition {TRANSPARENT THERMOPLASTIC ACRYLONITRILE-BUTADIENE-STYRENE RESIN COMPOSITIONS}

The present invention relates to a transparent ABS thermoplastic resin composition, and more particularly, to a transparent ABS thermoplastic resin composition excellent in transparency and thermal stability, and excellent in surface sharpness without generating mold deposits.

Transparent acrylonitrile-butadiene-styrene (hereinafter referred to as "ABS") resin is a material having excellent transparency and processability, and is widely used to pursue diversification and differentiation of designs as OA articles and home appliances. In recent years, since these products are being enlarged, it is difficult to obtain sufficient processability with the melting characteristics of the current transparent ABS resin. Thus, a method of using a large amount of lubricant or increasing the processing temperature in order to increase the processability of the resin has been mainly proposed.

However, when injecting a transparent ABS resin at a high temperature for a long time, there is a problem that deteriorates the surface sharpness of the transparent resin by generating a mold precipitate due to the generation of gas due to decomposition of the resin. At this time, it is possible to solve by reinforcing the gas vent (Gas Vent) of the mold, but there is a need to fundamentally suppress the gas generation of the resin itself.

Japanese Laid-Open Patent Publication No. 2001-81271 discloses a transparent thermoplastic resin having excellent transparency and moldability, but when injected at a high temperature for a long time, a mold precipitate is generated due to the generation of gas due to decomposition of the resin. Surface clarity has problems.

In order to solve the problems of the prior art as described above, an object of the present invention is to provide a transparent ABS thermoplastic resin composition excellent in transparency and thermal stability, gas generation is suppressed to prevent the generation of mold deposits and excellent surface clarity. .

The above and other objects of the present invention can be achieved by the present invention described below.

In order to achieve the above object, the present invention provides a transparent thermoplastic resin composition comprising a polysulfide in a transparent acrylonitrile-styrene-butadiene resin.

Hereinafter, the present invention will be described in detail.

The transparent ABS resin is a styrene-based transparent resin prepared by graft copolymerization of a polybutadiene rubber latex into a monomer mixture of a methacrylic acid alkyl ester or an acrylic acid alkyl ester compound, an aromatic vinyl compound, and a vinyl cyan compound.

The polybutadiene rubber latex is preferably used in 10 to 50 parts by weight. When the content is 10 to 50 parts by weight, there is an excellent impact strength and transparency of the molded article.

The methacrylic acid alkyl ester or acrylic acid alkyl ester compound is preferably used in 30 to 70 parts by weight. When the content is 30 to 70 parts by weight, the transparency is excellent, there is an effect that the impact strength is improved.

The aromatic vinyl compound is preferably used in 5 to 25 parts by weight. When the content is 5 to 25 parts by weight, sufficient processability can be secured, and at the same time, transparency is also excellent.

The vinyl cyan compound is preferably used in 1 to 15 parts by weight. When the content is 1 to 15 parts by weight, there is no phenomenon that the color of the resin becomes yellow, and the impact strength is excellent.

The polysulfide may be a compound prepared by a chemical reaction of mercaptan and sulfur, and more preferably has a form represented by the following formula (1).

[Formula 1]

In Chemical Formula 1,

R1 and R2 are alkyl groups having 9 to 12 carbon atoms, and n is an integer of 3 or 5.

It is preferable that the said polysulfide has an alkyl group of 9-12 carbon atoms. When the number of carbon atoms is 9 to 12, the smell is not severe and is easy to apply to the resin, there is an advantageous effect to secure the transparency of the resin.

It is preferable that the said polysulfide is an integer of 3 or 5 the number of sulfur represented by n. If the number of sulfur is an integer of 3 or 5, the effect of suppressing the gas generation of the resin is large, the color is transparent, and there is an effect that it is easy to apply to the resin.

The polysulfides having an integer number of 3 or 5 represented by n may be di-n-nonyl trisulfide, di-n-nonyl pentasulfide, or di-. di-t-nonyl trisulfide, di-t-nonyl pentasulfide, di-n-decyl trisulfide, di-n- Di-n-decyl pentasulfide, di-n-undecyl trisulfide, di-n-undecyl pentasulfide, di-n- Dodecyl trisulfide, di-n-dodecyl pentasulfide, di-t-dodecyl trisulfide, or di-n-dodecyl trisulfide t-dodecyl pentasulfide (di-t-dodecyl pentasulfide) may be used alone or in combination of two or more thereof. Particularly considering the color tone, di-n-nonyl pentasulfide, di-t-dodecyl trisulfide, and di-t-dodecyl pentasulphide t-dodecyl pentasulfide) is preferred.

The polysulfide may be used in an amount of 0.01 to 3 parts by weight, preferably 0.05 to 2 parts by weight, and more preferably 0.1 to 1 part by weight, based on 100 parts by weight of the transparent ABS resin. When the content is 0.01 parts by weight to 3 parts by weight, it is possible to sufficiently suppress the gas generation of the resin to secure the surface sharpness of the transparent resin, there is a remarkably excellent thermal stability.

The transparent ABS thermoplastic resin composition of the present invention may further include additives such as known ultraviolet absorbers, antioxidants, light stabilizers, dyes, or pigments as necessary.

Hereinafter, preferred examples are provided to help understanding of the present invention, but the following examples are merely to illustrate the present invention, and the scope of the present invention is not limited to the following examples.

EXAMPLE

Example 1

(1) Preparation of Transparent ABS Resin (A-1)

15 parts by weight of polybutadiene rubber latex, 85 parts by weight of ion-exchanged water, and 0.2 parts by weight of sodium oleate emulsifier were collectively administered at 50 ° C, and the reaction temperature was raised to 80 ° C over 2 hours for reaction. Then, 80 parts by weight of ion-exchanged water, 0.4 parts by weight of alkylarylsulfonate salt emulsifier, 60.2 parts by weight of methyl methacrylate, 19.8 parts by weight of styrene, 5 parts by weight of acrylonitrile, and tertiary dodecyl mercaptan 0.7 Parts by weight, 0.048 parts by weight of sodium pyrophosphate, 0.012 parts by weight of dextrose, 0.001 parts by weight of ferrous sulfide, and 0.1 parts by weight of cumene hydroperoxide were continuously administered for 6 hours, and then again heated to 82 ° C. Aged for 1 hour, the reaction was terminated. After the completion of the polymerization, the polymerization conversion was 99.5% and the solid coagulation content was 0.1%. An antioxidant and a stabilizer were administered to the latex to coagulate with an aqueous calcium chloride solution at a temperature of 90 ° C. or higher, followed by dehydration and drying to obtain a powder.

(2) Preparation of Transparent ABS Resin Composition

After mixing 0.01 parts by weight of di-n-nonyl pentasulfide (DNPS) as a polysulfide to the prepared transparent ABS resin, melt kneading with a 40 Φ single screw extruder to prepare pellets, and then injection To prepare a specimen, and measured physical properties are shown in Table 1 below.

Example 2

Except for using the di-n-nonyl pentasulfide (DNPS) 0.5 parts by weight as a polysulfide in Example 1 was carried out in the same manner as in Example 1.

Example 3

Except for using the di-t-dodecyl trisulfide (DDTS) 0.5 parts by weight as a polysulfide in Example 1 was carried out in the same manner as in Example 1.

Example 4

0.5 parts by weight of di-n-nonyl pentasulfide (DNPS) and 0.5 parts by weight of di-t-dodecyl trisulfide (DDTS) as the polysulfide in Example 1 The same procedure as in Example 1 was carried out except that the mixture was used.

Example 5

In the preparation of the transparent ABS resin of Example 1 (1) using a transparent ABS resin (A-2) using 20 parts by weight of polybutadiene latex, 54.5 parts by weight of methyl methacrylate, 18.5 parts by weight of styrene, 7 parts by weight of acrylonitrile In the same manner as in Example 1, except that 0.5 parts by weight of di-t-dodecyl pentasulfide (DDPS) was used as a polysulfide in preparing the transparent ABS resin composition of (2). Was carried out.

Example 6

0.5 parts by weight of di-n-nonyl pentasulfide (DNPS) and 1.5 parts by weight of di-t-dodecyl trisulfide (DDTS) as polysulfides in Example 5 The same procedure as in Example 5 was carried out except that the mixture was used.

Comparative Example 1

Except that the polysulfide was not used in Example 1 was carried out in the same manner as in Example 1.

The physical properties of the specimens prepared according to the Examples and Comparative Examples were measured by the following method and the results are shown in Table 1 below.

* Haze-measured according to ASTM 1003.

* Surface sharpness (light transmittance)-measured according to ASTM 1003.

* Retention Thermal Stability-After injection for 15 minutes at 250 ℃ in an injection molding machine, injection molded products were obtained, and the ΔE values of the molded products not retained using Color Lab Quest II of Hunter Lab were calculated by the following equation. .

[Equation]

In the above equation, the subscript 2 represents the injection molded article after staying in the injection molding machine, and the subscript 1 represents a molded article not remaining.

division Transparent ABS resin Polysulfide Transparency (%) Surface sharpness (%) △ E A-1 A-2 Kinds Parts by weight Example 1 100 DNPS 0.1 1.8 91.0 2.5 Example 2 100 DNPS 0.5 1.8 91.5 2.6 Example 3 100 DDTS 0.5 1.9 91.7 2.0 Example 4 100 DNPS DDTS 0.5 0.5 2.0 91.7 2.9 Example 5 100 DDPS 0.5 1.9 91.5 2.8 Example 6 100 DNPS DDTS 0.5 1.5 2.1 91.2 2.7 Comparative Example 1 100 - - 2.3 86 3.0

As described above, the transparent ABS-based thermoplastic resin composition including the polysulfide of the present invention has excellent transparency, almost no discoloration during injection retention, and gas generation is suppressed to prevent mold deposits, thereby providing excellent surface sharpness. There is an effect of providing a transparent ABS thermoplastic resin composition.

Although described in detail above with reference to the specific embodiments of the present invention, it will be apparent to those skilled in the art that various changes and modifications can be made within the scope and spirit of the present invention, and such variations and modifications belong to the appended claims. It is also natural.

Claims (6)

A transparent ABS thermoplastic resin composition comprising a polysulfide in a transparent acrylonitrile-butadiene-styrene resin. The method of claim 1, The polysulfide is a transparent ABS thermoplastic resin composition, characterized in that represented by the formula (1). [Formula 1]

In Chemical Formula 1, R1 and R2 are alkyl groups having 9 to 12 carbon atoms, and n is an integer of 3 or 5. The method of claim 1, The polysulfide is a transparent ABS thermoplastic resin composition, characterized in that contained in 0.01 to 3 parts by weight based on 100 parts by weight of the transparent acrylonitrile-butadiene-styrene resin. The method of claim 1, The transparent acrylonitrile-butadiene-styrene resin is polybutadiene rubber latex 10 to 50 parts by weight, methacrylic acid alkyl ester or acrylic acid alkyl ester compound 30 to 70 parts by weight, aromatic vinyl compound 5 to 25 parts by weight, and vinyl cyan A transparent thermoplastic resin composition prepared by graft copolymerization of 1 to 15 parts by weight of a compound. The method of claim 1, The polysulfides include di-n-nonyl trisulfide, di-n-nonyl pentasulfide, and di-t-nonyl trisulfide ), Di-t-nonyl pentasulfide, di-n-decyl trisulfide, di-n-decyl pentasulfide, Di-n-undecyl trisulfide, di-n-undecyl pentasulfide, di-n-dodecyl trisulfide Di-n-dodecyl pentasulfide, di-t-dodecyl trisulfide, and di-t-dodecyl pentasulfide A transparent thermoplastic resin composition, characterized in that at least one selected from the group consisting of pentasulfide) is used. The method of claim 1, The transparent thermoplastic resin composition further comprises one or more additives selected from the group consisting of ultraviolet absorbers, antioxidants, light stabilizers, dyes, and pigments.