JPS58217541A - Low-temperature impact-resistant resin composition - Google Patents

Abstract

PURPOSE:To provide a vinyl chloride resin compns. exhibiting excellent impact resistance at low temp., by adding an impact modifier and a processing aid. CONSTITUTION:100pts.wt. vinyl chloride resin such as a graft copolymer obtd. from vinyl chloride and an ethylene/vinyl acetate copolymer, 5-25pts.wt. impact modifier, pref. based on an acrylic resin, and 0.5-20pts.wt. olefin processing aid such as an ethylene/alpha-olefin copolymer, are blended together.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a low-temperature impact-resistant resin composition, and more particularly to a vinyl chloride-based resin composition that exhibits excellent impact resistance at low temperatures.

In order to improve the impact resistance of vinyl chloride resin, styrene-butadiene rubber (SDR) and polybutadiene-acrylonitrile-styrene graft polymerization (8BS
), polybutadiene-methyl methacrylate-styrene graft polymers (MBS) and other butadiene-based truncation polymers, polyethylene (PE), chlorinated polyethylene (CPE), ethylene-vinyl acetate copolymers <Evh ), those based on polyolefin resins, and acrylic acid ester-based 114 resins (RA).

It is well known that acrylic resin-based materials such as methacrylic acid ester resins (RFvLA) should be used as impact resistance improvers.

However, molded products made from vinyl chloride resin compositions containing modifiers for improving impact resistance do not have the expected impact resistance above room temperature, but their impact resistance significantly deteriorates at low temperatures. 1. For example, when used outdoors such as agricultural props and road props, even a slight external force may cause cracks in the winter.'9. Zoni was used in practical applications in cold regions or low humidity environments.

The purpose of the present invention is to avoid such problems and to provide a tau resin composition that exhibits excellent impact resistance, especially when kept at low temperatures. It is made by adding a property improver (1) and an olefin-based processing aid (1) to a vinyl resin.

In the present invention, examples of the vinyl chloride resin include copolymers of vinyl chloride and vinyl acetate, ethylene propylene, vinylitine chloride, dister acrylate, etc., in addition to vinyl chloride resin, but in particular, ethylene-acetic acid Graft polymer of vinyl copolymer and vinyl chloride (EVA-pvc
) is a preferred material for the present invention because it itself has considerable low temperature impact resistance.

Also, a system that uses EVA in combination with vinyl chloride resin.

Ethylene-vinyl chloride copolymer CP (VC-E))
Systems using VA in combination have physical properties similar to those of EVA-PVC, and are therefore suitable as the vinyl chloride-based bright resin of the present invention.

In addition, in the present invention, one type or number 74 or more appropriately selected from the above-mentioned vinyl chloride resins is used, and in addition to the external υ+ll agent, if necessary, a heat stabilizer, a fi agent,
Antioxidants, UV absorbers, inorganic fillers, and flame retardants can be added.

Next, in the present invention, as impact resistance improvers, known ones based on buta-C-ene type side fats, polyolefin resins, and acrylic resins as mentioned above are used. It is preferable that In the present invention, one or more types of impact resistance improvers can be selected and used, but 1 to 50 parts by weight, preferably 5 to 25 parts by weight per 100 parts of vinyl chloride resin. Please add as much as possible.

Furthermore, as an ophthalmic processing aid added to the vinyl chloride resin together with the impact resistance improver, ethylene-α-olefin copolymer (α-Et) and other copolymers, or combinations of olefin resin and other substances can be used. Use a mixture. Olefin-based JJO processing aids can also be used in combinations of 11 or 2 or more.
Add in the range of ~30 parts by weight, preferably 05-20 parts by weight.

Next, the test results of the comparative column and the practical column of the present invention will be described.

Throughout Tests A-1 to A-6, each sample was kneaded with an 8-inch test roll (roll 17, 150 mm).
~ 160℃ (1 roll and kneading for 5 minutes) to make a sheet to be kneaded, press coloring (temperature 180℃ for 1 hour 1 hour)
Press at a maximum pressure of 120°C for 0 minutes to form a smooth sheet with a thickness of 5cm.

A test piece conforming to JIS K-7111 was formed by cutting IJII machining. The exam is Charpy f'i attack UC
The test was conducted using a testing machine in accordance with JIS K-7111, and the test piece was heated or cooled so that it would be tested at a predetermined temperature IW. In addition, the acrylic modifier, acrylic processing aid, and olefin processing aid used in each test are each under the trade name Frej) HIA28. Metablen P501, Tafmar P
O680 was used.

[Test A-1] As a vinyl chloride resin, Hi-Resin H-130 (trade name, manufactured by Toyo Soda Kogyo Co., Ltd.) (al) was selected from EVA-PvCQ.

H-120 (bl, H-110 (cl, EVA
Containing 40% (d).

P (contains 4 ethylene from VC-E; = s
o.

(Using LJA bivinyl resin 1 with el and p = 1000, 5 heavy liquid parts of lead-based stabilizer for each 100 parts by weight.

7.5 parts by weight of acrylic modifier, 1 part of acrylic processing aid
．． Test heath ram head (23'C.

-10°C) and residual temperature (-10°C) are as shown in the following table σ).

[Test Person-2] A lead-based stabilizer was prepared by adding 7.5 parts by weight of an acrylic modifier to 100 parts by weight of HiResin H-130 as the vinyl chloride resin.

Impact value (23℃, -10℃) and residual rate (-
10°C) are as shown in the following table.

[Test A-3] Hiresin H-130 (trade name) was used as the vinyl chloride resin, and 5 parts by weight of lead stabilizer and 1.5 parts by weight of acrylic processing aid were added to 100 parts by weight of the vinyl chloride resin.

3 parts by weight of an olefin-based processing aid is added to the acrylic yarn number η31 (at, 1; 1) to which 3 parts by weight of an olefin-based processing aid is added.
From MBS, the product name is Kane Ace B22 [cl; from the olefinic modifier CPE, the product name is Gusolac G-2.
45 (product name TG-40 from di and EVA-PVC
The impact value of the test piece to which each of the seven substances was added (23
℃, -10℃) and residual rate (-10℃) are shown in the following table.

[Test A-4] Vinyl chloride resin as vinyl chloride resin = 1000)
(EVA for lo heavy kick part (product name Elpaloy 843)
Impact of a test piece prepared by adding 10 parts by weight of a lead-based stabilizer, 1.5 parts by weight of an acrylic processing aid, an acrylic modifier, and an olefin processing aid as appropriate. Value (23℃, -10℃) and residual rate (-10℃
) are shown in the table below.

[Test A-5] Using the part name Hi-Resist 130 as the vinyl chloride resin, 100 parts by weight of the resin, 5 parts by weight of a pressurized lead agent, and 1.5 parts by weight of an acrylic processing aid were added to the acrylic modifier. , Impact value (23'C, -10°C) of test piece with olefinic processing aid and commercial additive added: J-: and residual h:
(-10'C) +i This is a trace of the r table.

[Test A-6] As a vinyl chloride resin, trade name: Ire C/H-130
5 parts by weight of lead-based stabilizer to the 100-yen amount 1),
Acrylic processing aid 1. Impact value of test pieces (23°C
, -10C) and residual rate (-10C) are shown in the following table.

[Test B]

Next, the sample was tested according to JISK-711 in the same manner as in each of the above tests.
The sample was molded into a test piece having a value of 0, and tested in accordance with JIS K-7110 using an Izot tester. The present invention contains 100 parts by weight of the product name Hi-Resin H-130, 5 parts by weight of a lead-based stabilizer, 0.5 ton h (parts) of a cord stabilizer, and 7.5 parts by weight of an acrylic modifier.

Comparative product 1 contains 100 parts by weight of part name Hi-Resin H-130 and 6 parts by weight of tin-based stabilizer. part, acrylic yarn modifier 15ME ft part,
Comparative product 2 is vinyl chloride resin (i;=to
oo), 100-weight lead-based stabilizer, 15 weight parts of acrylic modifier, and 1.5 parts by weight of acrylic processing aid were added, and the shock value at each defined temperature, The remaining rates are shown in the table below.

From the above test results, it is clear that as a vinyl chloride-based resin, it is preferable to use a graft polymer or copolymer with vinyl chloride as the main resin, or a system in which EVA is used in combination, rather than vinyl chloride resin alone, and to improve impact resistance. The appropriate amount of the olefin-based 71υ processing aid is determined based on the fact that acrylic-based modifiers are preferred as property improvers, and the type and amount of vinyl chloride resin, modifier, etc. By adding this, the impact resistance at low temperatures is dramatically improved.)
.

Agent Mutsuaki Nozawa

Claims (1)

[Scope of Claims] (11) A low-temperature impact resistant resin composition characterized by adding an impact resistance improver and an olefin processing aid to a vinyl chloride resin. (2) A vinyl chloride resin The resin composition according to claim (1), which is a graph zt combination of an ethylene-vinyl acetate copolymer and vinyl chloride. (3) The vinyl chloride resin is a vinyl chloride resin mixed with ethylene-
The resin composition according to claim (1), which is a system in which a vinyl acetate copolymer is also used. (4) The resin composition according to claim (1), in which the vinyl chloride resin is a combination of an ethylene-vinyl chloride copolymer and an ethylene-vinyl acetate copolymer. (5) The resin composition according to claim (1), wherein the impact resistance improver is a modifier based on an acrylic resin. (6) 100 parts by weight of vinyl chloride resin, 5 to 25 parts by weight of impact resistance improver and 2 to 2 parts of olefin processing aid O, S
The resin composition according to claim (1), in which 0 parts by weight is added.