KR20110084495A - Thermoplastic resin composition for cleaning molding machine - Google Patents

Abstract

The present invention provides a thermoplastic resin composition excellent as a detergent for cleaning a molding machine. Specifically, with respect to 100 parts by mass of polypropylene resin having an MFR of 0.1 to 1.0 g / 10 minutes,
(A) 5 to 60 parts by mass of ethylene / acrylic copolymer,
2 to 60 parts by mass of (B) unsaturated carboxylic acid-modified polyolefin resin,
(C) It is a thermoplastic resin composition for molding machine cleaning containing 1-10 mass parts of surfactants.

Description

Thermoplastic resin composition for molding machine cleaning {THERMOPLASTIC RESIN COMPOSITION FOR CLEANING MOLDING MACHINE}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thermoplastic resin composition for cleaning a molding machine having good cleaning properties of molding machines such as an extruder and an injection molding machine.

Japanese Patent No. 3179190 discloses a purge agent comprising an inorganic filler and a chemical foaming agent in an ethylene / unsaturated carboxylic acid ester copolymer, and Japanese Patent No. 3179253 discloses a polyethylene, an ethylene / unsaturated carboxylic acid ester copolymer, an inorganic filler, A purge agent consisting of a chemical blowing agent and a slip agent is disclosed. Although these purging agents aim at purging an olefin resin, since the washability is not enough and an inorganic filler is mix | blended, substitution with polypropylene resin was not easy.

Japanese Patent Laid-Open No. 4-246443 discloses a resin composition for cleaning in which a mixture of a polyolefin resin, an acrylic copolymer, a neutral salt of organic sulfonic acid, magnesium carbonate, magnesium hydroxide, and the like is mixed. .

Japanese Patent Laid-Open No. 7-329113 discloses a resin composition for cleaning a molding machine containing an olefinic thermoplastic resin containing an unsaturated group-containing carboxylic acid derivative-modified olefinic resin polyalkylene oxide or polyalkylene glycol surfactant and a metal salt of a fatty acid. Although this is disclosed, washability was not enough.

Japanese Patent No. 3784506 discloses a purging agent containing a polyamide, an ethylene-unsaturated carboxylic acid copolymer-based resin, and a metal salt of Group II of the periodic table, but substitution with a polypropylene resin was not easy.

An object of this invention is to provide the thermoplastic resin composition for shaping | molding a molding machine used for shaping | molding a thermoplastic resin, and having good substitution property with the polypropylene resin after washing | cleaning.

The present invention as a solution to the problem

With respect to 100 mass parts of polypropylene resins whose MFR is 0.1-1.0 g / 10min,

(A) 5 to 60 parts by mass of ethylene / acrylic copolymer,

2 to 60 parts by mass of (B) unsaturated carboxylic acid-modified polyolefin resin,

(C) The thermoplastic resin composition for washing the molding machine containing 1-10 mass parts of surfactants is provided.

Moreover, this invention provides the use of the molding machine cleaning of the said thermoplastic resin composition.

The thermoplastic resin composition for cleaning the molding machine of the present invention has good molding machine cleaning property used for molding the thermoplastic resin, and has good substitution property with the polypropylene resin after cleaning, that is, the removal property of the composition remaining after cleaning. This is good.

<Polypropylene resin>

The polypropylene resin has an MFR of 0.1 to 1.0 g / 10 minutes, preferably 0.2 to 0.8 g / 10 minutes, and more preferably 0.3 to 0.7 g / 10 minutes. MFR is the value measured on the conditions of the measurement temperature of 230 degreeC, and 2.16 kg of loads according to the method of ISO 1133.

The polypropylene resin is preferably a mixture of a homopolymer of polypropylene and a block copolymer, the mass ratio of the homopolymer and the block copolymer is preferably 1/9 to 9/1, more preferably 2/8 to 8 / 2, More preferably, it is 3 / 7-7 / 3.

The block copolymer of propylene and ethylene may be sufficient as a polypropylene resin, and in that case, it is preferable that the quantity of a propylene unit exceeds 50 mol%.

<(A) Ethylene Acryl Copolymer>

The component (A) includes ethylene-ethyl acrylate copolymer (EEA), ethylene-methacrylate copolymer (EMA), ethylene-butyl acrylate (EBA), ethylene-methyl methacrylate copolymer (EMMA), and the like. Can be.

Specifically, EVAFLEX (EEA) made by Mitsui DuPont Poly Chemicals, Nippon Bonunia EVA made by Nippon Unicar Co., Ltd., Rex Pearl (EMA) made by Nippon Polyolefin Co., Ltd., LOTRYL (EMA, EBA) made by ATOFINA, Sumitomo Kagaku Arc Lift Co., Ltd. (EMMA) etc. can be mentioned.

Content of (A) component in a composition is 5-60 mass parts with respect to 100 mass parts of polypropylene resins, Preferably it is 10-50 mass parts, More preferably, it is 10-45 mass parts, More preferably, 15 It is-40 mass parts.

<(B) unsaturated carboxylic acid modified polyolefin resin>

Maleic acid modified polyethylene, maleic acid modified polypropylene, etc. can be used as (B) unsaturated carboxylic acid modified polyolefin resin.

Content of (B) component in a composition is 2-60 mass parts with respect to 100 mass parts of polypropylene resins, Preferably it is 10-50 mass parts, More preferably, it is 10-45 mass parts, More preferably, 15 It is-40 mass parts.

<(C) surfactant>

As the surfactant of component (C), a known surfactant may be used as a component of the detergent for washing the molding machine, and at least one selected from the metal salt of alkanesulfonic acid, the metal salt of α-olefinsulfonic acid, and the metal salt of alkylbenzenesulfonic acid is preferable. Do. The alkanes, α-olefins and alkylbenzenes in the metal salt of alkanesulfonic acid, the metal salt of α-olefinsulfonic acid and the metal salt of alkylbenzenesulfonic acid each preferably have 8 to 20 carbon atoms. The metal species to be a salt is at least one selected from alkali metals or alkaline earth metals.

Content of (C) component in a composition is 1-10 mass parts with respect to 100 mass parts of polypropylene resins, Preferably it is 1-5 mass parts, More preferably, it is 4-6 mass parts, More preferably, 1 It is-3 mass parts.

<(D) polyethylene resin>

A polyethylene resin can be further mix | blended with the composition of this invention in order to raise a washing effect. As for content of (D) component, 0-30 mass parts is preferable with respect to 100 mass parts of polypropylene resin, Preferably it is 0-20 mass parts, More preferably, it is 0-10 mass parts.

Moreover, also when mix | blending the block copolymer of propylene and ethylene, the effect similar to the case where the polyethylene resin is mix | blended as (D) component can be acquired.

&Lt; Other components >

The composition of this invention can mix | blend well-known inorganic fillers, such as glass fiber and rock wool further. As for content of an inorganic filler, 0.5-150 weight part is preferable with respect to 100 mass parts of polypropylene resins, 10-140 mass parts is more preferable, 20-120 mass parts is more preferable.

The composition of this invention can contain various well-known additives in the range which can solve the subject of this invention. As a well-known additive, For example, in addition to the alkylene glycol fatty acid ester of Paragraph 12, 13 of Unexamined-Japanese-Patent No. 3179190, the polyhydric alcohol and metal soap of Unexamined-Japanese-Patent No. 2000-119464, or Japan Unexamined-Japanese-Patent 2002- The phosphate ester type compound of Unexamined-Japanese-Patent No. 1734 can be used.

The composition of the present invention can be obtained by premixing each component with a mixer such as Henschel mixer, tumbler blender, kneader and the like, followed by melt kneading in an extruder, or melt kneading with a heating roll or Banbury mixer.

(Example)

Examples 1-4, Comparative Examples 1-4

After mixing each component of the composition shown in Table 1 with the tumbler blender, it melt-kneaded with the extruder and obtained the pellet-shaped washing resin composition. Using these compositions, the washing test was done by the following method. The results are shown in Table 1.

(Cleanability)

Black-colored product (dry color) of polypropylene resin (prime polypropylene J-2000GP, MFR21 made of prime polymer) as injection resin (Mitsubishi injection molding machine "Mitsubishi injection molding machine 265 / 100MSII"; cylinder temperature 250 degreeC) as prior use resin 1% of carbon black concentration 2%) was poured. Next, it evaluated by the usage-amount of the composition of each washing resin composition of the composition of Table 1 until it disappeared (visually confirmed).

(Substitution to Polypropylene Resin)

After the washing was completed, 1 kg of polypropylene resin (prime polypropylene J-2000GP made of prime polymer, MFR21) was discharged, and then, a 10 cm x 10 cm, 2 mm thick flat plate was formed of the polypropylene resin, It judged by the number of shaping | molding until a residue was no longer confirmed.

PP1: polypropylene (prime polypropylene E-150GK made from prime polymer, block copolymer MFR0.6g / 10min)

PP2: polypropylene (prime polypropylene E111G made from a prime polymer, a homopolymer, MFR 0.5g / 10min)

EEA: Ethylene ethyl acrylate copolymer (Elvaloi AC 2112AC made by Mitsui Dupont Polychemical Co., Ltd.)

EMMA: Ethylene methyl methacrylate copolymer (Arclift WD201 made by Sumitomo Chemical Co., Ltd.)

Mah-pe: acid-modified polyethylene (nucrel n0908c made by mitsui DuPont polychemical)

MAH-PP: acid-modified polypropylene (modic P908 made by Mitsubishi Kagaku)

PE: Polyethylene (Hi-Jex 5000SF made from Prime Polymer, high density PE, MFR 0.66)

Surfactants; Sodium Dodecylbenzenesulfonate

As apparent from the contrast of Examples 1 to 4 and Comparative Examples 1 to 3 of Table 1, by using together the ethylene-acrylic copolymer of component (A) and the unsaturated carboxylic acid-modified polyolefin of component (B), In addition to increasing the detergency, the detergency to the polypropylene resin after washing was good (that is, the removability of the composition remaining after washing was good).

Claims (4)

With respect to 100 mass parts of polypropylene resins whose MFR is 0.1-1.0 g / 10min,
(A) 5 to 60 parts by mass of ethylene / acrylic copolymer,
2 to 60 parts by mass of (B) unsaturated carboxylic acid-modified polyolefin resin,
(C) The thermoplastic resin composition for washing a molding machine containing 1-10 mass parts of surfactants. The thermoplastic resin composition according to claim 1, wherein the polypropylene resin is a mixture of a homopolymer of polypropylene and a block copolymer, and the weight ratio of the homopolymer and the block copolymer is 1/9 to 9/1. The thermoplastic resin composition according to claim 1 or 2, wherein the surfactant (C) is at least one selected from a metal salt of alkanesulfonic acid, a metal salt of α-olefinsulfonic acid, and a metal salt of alkylbenzenesulfonic acid. The thermoplastic resin composition of any one of Claims 1-3 which further contains 0-30 mass parts of (D) polyethylene resin with respect to 100 mass parts of polypropylene resins.