JPS59159845A - Vinyl chloride resin composition - Google Patents

Abstract

PURPOSE:To provide a vinyl chloride resin compsn. having excellent resistance to weather and low-temperature impact, consisting of a vinyl chloride resin and a vinyl chloride graft copolymer resin obtd. by copolymerizing vinyl chloride with an ethylene/vinyl acetate copolymer resin. CONSTITUTION:A resin compsn. consists of 10-40pts.wt. vinyl chloride resin having an average degree of polymn. of 600-1,400 and 90-60pts.wt. vinyl chloride graft copolymer resin obtd. by graft copolymerizing 95-80pts.wt. vinyl chloride onto 5-20pts.wt. ethylene/vinyl acetate copolymer resin having a vinyl acetate content of 10-45wt%. Pref. the vinyl acetate content of said copolymer resin is 15-30wt% from the viewpoint of reducing lowering in rigidity. The vinyl chloride resin is one having an average degree of polymn. of 600-1,400 prepd. by suspension polymn., and one having an average degree of polymn. of 700-1,100 is preferred from the viewpoints of flow characteristics and compatibility.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a vinyl chloride resin composition having excellent weather resistance and low-temperature impact resistance.

More specifically, for 5 to 20 parts of ethylene vinyl acetate copolymer resin having a vinyl acetate content of 10 to 45% by weight,
Consists of 90 to 60 parts by weight of a vinyl chloride-based graft copolymer resin obtained by graft copolymerizing 95 to 80 parts by weight of vinyl chloride, and 10 to 40 parts by weight of a vinyl chloride-based resin having an average degree of polymerization of 600 to 1,400. The present invention relates to a resin composition characterized by:

Vinyl chloride resins have excellent physical and mechanical properties and are therefore used in many applications.

It has sufficient performance for practical use in terms of warpability, heat resistance, and -11 resistance. However, it has the disadvantage that it has very low impact resistance, and an impact strengthener must be added. Various types of impact strengthening agents are known in the art, such as MBS, chlorinated polyethylene, and acrylic rubber, but most of them improve impact strength at room temperature, but greatly reduce heat resistance and rigidity. There was little improvement in impact resistance at low temperatures and poor weather resistance, so there were practical limitations in building materials and window frame applications that required impact resistance and weather resistance at low temperatures. .

As a result of repeated studies by the present inventors to overcome the various drawbacks mentioned above, we found that the use of a mixture of ethylene vinyl acetate copolymer resin and vinyl chloride resin provides good weather resistance, low-temperature impact resistance, heat resistance, The present invention was completed based on the knowledge that a resin composition with well-balanced rigidity can be obtained.

That is, the present invention relates to a vinyl chloride resin composition with excellent weather resistance and low-temperature impact resistance, and provides a composition particularly suitable for outdoor building components and external window frames for cold regions. .

The graft copolymer resin of ethylene vinyl acetate copolymer resin and vinyl chloride used in the present invention may be produced by any method such as suspension polymerization, emulsion polymerization, swelling polymerization, or bulk polymerization, and its shape It may also be in the form of a powder or a single grain.

As will be described later, in the present invention, the graft copolymer resin is preferably used in a powder form obtained by the suspension polymerization method, since it is used in combination with the suspension polymerization vinyl chloride resin.

The vinyl acetate content of the ethylene vinyl acetate copolymer resin, which is a component constituting the graft copolymer resin used in the present invention, can range from 10 to 45% by weight. Preferably, the vinyl content is 15 to 30% by weight. In addition, the graft copolymer resin is
An ethylene vinyl acetate copolymer resin can be used in a range of 5 to 20 parts by weight per 95 to 80 parts by weight of vinyl chloride.

The vinyl chloride resin used in the present invention is produced by a suspension polymerization method and has an average polymerization degree of 600 to 1,400, but due to fluidity and compatibility issues, the average polymerization degree is 700 to 1.
A range of 100 is preferred.

This vinyl chloride resin may be any of vinyl chloride homopolymer resin, vinyl chloride/vinyl acetate copolymer resin, and vinyl chloride/ethylene copolymer resin.

The mixing ratio of the graft copolymer resin and vinyl chloride resin used in the present invention is 10 to 40 parts by weight of the vinyl chloride resin to 90 to 60 parts by weight of the graft copolymer resin. In view of the balance of impact resistance, it is preferable to use 10 to 30 parts by weight of the vinyl chloride resin based on 90 to 70 parts by weight of the graft copolymer resin.

In the above, when the graft copolymer resin is 90 parts by weight or more, the rigidity is insufficient, and when it is 60 parts by weight or less, the impact resistance at low temperatures is insufficient.

The composition of the present invention optionally contains stabilizers and lubricants.

There is no problem in adding fillers, ultraviolet absorbers, antioxidants, pigments, etc. in conventionally known proportions.

An example of a stabilizer that can be added is tribasic lead sulfate.

Examples include lead stabilizers such as lead stearate, metal soap stabilizers such as calcium stearate and zinc stearate, organotin stabilizers such as octyltin mercaptide and diptyltin maleate, and organic surface phosphate esters, Examples include co-stabilizers such as phenylindole.

Examples of lubricants include hydrocarbon lubricants such as natural paraffin and liquid paraffin polyethylene wax, fatty acid lubricants such as stearic acid, fatty acid amide lubricants such as stearamide, ester lubricants such as ethylene glycol monostearate, and calcium laurate. Examples include metal soap-based lubricants.

Examples of fillers include calcium carbonate, kaolin, clay, and gypsum.

Examples of ultraviolet absorbers include benzophenone-based UV absorbers such as 2,4-dihydroxybenzophenone, bencitoriazole-based UV absorbers such as 2-(2'-hydroxy-5-methylphenyl)pencitriazo and Ru, and salicylic acid ester-based UV absorbers such as phenyl salicylate. can be given.

Examples of antioxidants include bisphenols such as 2-27-methylene-bis-(4methyl-6-tert-butylphenol), monophenols such as 2,6-ditertiary-butylphenol, and 2,5-ditertiary-butylhydroquinone. Examples include hydroquinone antioxidants.

Examples of pigments include carbon black and titanium oxide.

The resin composition of the present invention is prepared by adding various additives such as stabilizers, fillers, lubricants, pigments, etc. to the graft copolymer resin and vinyl chloride resin in a Henschel mixer.

It is obtained by uniformly mixing the composition using a conventionally known method using a Banbury mixer, etc. When the composition is actually used, it can be manufactured into building materials, window frames, etc. by conventionally known extrusion molding method or injection molding method. is obtained.

The composition of the present invention has high impact resistance at low temperatures and excellent weather resistance, so it can withstand severe usage conditions. Therefore, it is particularly impact resistant at severe low temperatures.

Suitable for window frames and outdoor building materials that require weather resistance.

The present invention will be explained below with reference to Examples.

Example 1 25 parts by weight of a vinyl chloride resin having an average degree of polymerization of 820 was mixed with 75 parts by weight of a graft copolymer resin consisting of 12 parts by weight of an ethylene vinyl acetate copolymer resin having a vinyl acetate content of 20 parts by weight and 88 parts by weight of vinyl chloride. Resin 100 obtained by
1.5 parts by weight of tribasic lead sulfate and 2.0 parts by weight of lead stearate.

15 parts by weight of dibasic lead stearate, 5 parts by weight of calcium carbonate
．． 0 parts by weight were uniformly mixed, kneaded for 10 minutes with a hot roll at 165°C, and pressed for 10 minutes with a hot press at 180°C to create a sheet, and the physical properties of samples taken from this sheet were determined. It was measured.

Comparative Example 1 A resin prepared by mixing 100 parts by weight of vinyl chloride resin with an average degree of polymerization of 820 and 10 parts by weight of methyl methacrylate-butadiene-styrene graft cobolimer was substituted for 100 parts by weight of the mixed resin of Example 1. The rest was carried out in the same manner as in Example 1.

The physical property test results are summarized in Table 1.

The measurement methods used to measure these physical properties are as follows.

(1) Heat distortion temperature test Method described in JIBK 7207 (2) Tensile test Method described in J Engineering S K 6745 (3) Sea r pain view line 1 deception J engineering 8 to 711
Method described in 1 (4) Bending test J to K72
Method described in Q5 (5) Accelerated weathering test JIsA14?
Comparing the heat distortion temperatures from Table 1, Example 1 is superior to Comparative Example 1, indicating that there is less deterioration in thermal properties.

The results show that the yield strength, maximum bending strength, and bending modulus are almost the same, and the rigidity is not significantly reduced.

Comparing the Charpy impact strength, Example 1 shows particularly excellent performance in the low temperature range, which is more than double that of Comparative Example 1.

A comparison of the Charpy impact strength after the accelerated weathering test shows that Example 1 has a significantly higher strength retention than Comparative Example 1, and is particularly excellent.

That is, the resin composition of the present invention can be said to be suitable for fields that require high impact resistance and weather resistance at low temperatures.

Example 2 40 parts by weight of a vinyl chloride resin having an average degree of polymerization of 1050 was mixed with 60 parts by weight of a graft copolymer resin consisting of 15 parts by weight of an ethylene-vinyl acetate copolymer resin having a vinyl acetate content of 21% by weight and 85 parts by weight of vinyl chloride. Resin 10 obtained by
The physical properties of 0 parts by weight were evaluated in the same manner as in Example 1, and the Charpy impact strength measured at -20°C was 10 kg.
Suho.

23. After 1000 hours of accelerated weathering test. :Charpy impact strength measured by C: 16 kg-on/crl (remaining rate: 7
8ch), which showed that it was excellent.

Patent applicant: Toyo Soda Kogyo Co., Ltd.

Claims (1)

[Claims] Ethylene acetate with a vinyl acetate content of 10 to 45 parts
90 to 60 parts by weight of a vinyl chloride graft copolymer resin obtained by graft copolymerizing 95 to 80 parts by weight of vinyl chloride to 5 to 20 parts by weight of a vinyl copolymer resin, and an average degree of polymerization of 600 to 1400 parts by weight. A vinyl chloride resin composition comprising 10 to 4 ag of a vinyl chloride resin.