JPH0625496A - Plastisol composition - Google Patents

Abstract

PURPOSE:To obtain a plastisol compsn. having a good processibility and undergoing no degradation in quality even when molded at a high temp. by compounding a vinyl chloride (co)polymer, a plasticizer, and a specific viscosity depressant. CONSTITUTION:This plastisol compsn. is prepd. by compounding a vinyl chloride (co)polymer, a plasticizer, a viscosity depressant consisting of an aliph. hydrocarbon having a b.p. of 200-350 deg.C (pref. a 14-18C linear alpha-olefin), and, if necessary, a filler. The compsn., even when the vinyl chloride (co)polymer has a high degree of polymn. and a small amt. of the plasticizer is compounded, is low in viscosity and easily handled and gives an excellent molded article undergoing no degradation in quality, such as the occurrence of craters, even when molded at a high temp.

Description

Detailed Description of the Invention

[0001]

This invention relates to plastisol compositions. More specifically, it relates to a plastisol composition which can be processed without impairing its processability even when processing a vinyl chloride (co) polymer, a filler and the like at a high concentration.

[0002]

2. Description of the Related Art Plastisol is a vinyl chloride (co) polymer compounded with a plasticizer, a viscosity reducing agent, a filler and the like and can be molded in a liquid state, and thus has been used for flooring materials, wallpaper, leather and the like. . To improve the physical properties of these molded products, increase the amount of vinyl chloride (co) polymer used in plastisol,
There are cases where a large amount of filler is used for the purpose of improving flame retardancy and cost reduction, but generally when the vinyl chloride (co) polymer and the amount of filler are increased, the resulting plastisol Since an inconvenience that the viscosity becomes high and the processability is deteriorated, an aliphatic hydrocarbon having a boiling point of 120 to 200 ° C. such as mineral spirits has been conventionally used as a viscosity reducing agent (Kinki Chemical Society of Japan). "Polyvinyl chloride-its basics and applications" p. 580, edited by the Vinyl Division, published by Nikkan Kogyo Shimbun in 1988).

[0003]

In recent years, in order to improve the strength and durability of molded articles, there is a demand for increasing the molecular weight of vinyl chloride resins used in plastisols. In this case, the plastisol composition is processed. It is necessary to raise the temperature to above 200 ° C. Further, even when the surface gloss is required as in the case of floor materials, it is necessary to raise the molding temperature to 200 ° C. or higher. However, in this case, if mineral spirits are used as a viscosity reducing agent, it will volatilize rapidly during the molding process, which may cause processing problems,
There has been a problem of causing deterioration of the quality of the molded product such as generation of craters on the surface.

[0004]

The present inventors have arrived at the present invention as a result of extensive studies to solve the above problems. That is, the present invention provides a plastisol composition comprising a vinyl chloride (co) polymer (A), a plasticizer (B), a viscosity reducing agent (C) and optionally a filler (D), wherein the viscosity reducing agent (C ) Is an aliphatic hydrocarbon having a boiling point of 200 to 350 ° C., which is a plastisol composition.

Vinyl chloride (co) polymer in the present invention (vinyl chloride homopolymer and / or copolymer)
As (A), a usual one can be used. Examples of vinyl chloride copolymers include copolymers of vinyl chloride and other vinyl monomers copolymerizable therewith (for example, vinylidene chloride, vinyl acetate, maleic anhydride or maleic acid ester, vinyl ether, etc.). . The average degree of polymerization of (A) is usually 700 to 5,000, and the particle size is usually 0.
It is 05-200micro.

All of the plasticizers (B) used in this invention are generally useful for this purpose, for example, phthalic acid such as dibutyl phthalate, diisoheptyl phthalate, dioctyl phthalate, diisononyl phthalate, diundecyl phthalate. Examples thereof include esters, adipic acid esters such as dioctyl adipate, sebacic acid esters such as dioctyl sebacate, phosphoric acid esters such as tricresyl phosphate, and mixtures of two or more thereof. Among these, preferred are phthalates, and particularly preferred is dioctyl phthalate.

As the viscosity reducing agent (C) in the present invention, an aliphatic hydrocarbon having a boiling point of 200 to 350 ° C. is used. When (C) a halogenated hydrocarbon having a high affinity for vinyl chloride, a compound having a polar group such as a ketone group or an ester group, or an aromatic hydrocarbon is used, the vinyl chloride swells, and the viscosity increases, so Aliphatic hydrocarbons are preferred in order to obtain a high viscosity-reducing effect with a small amount of addition. Examples of (C) include linear or branched saturated aliphatic hydrocarbons and unsaturated aliphatic hydrocarbons,
Unsaturated aliphatic hydrocarbons, which have the advantage of having a melting point below room temperature and are easy to handle, are preferred. The unsaturated aliphatic hydrocarbon may have an unsaturated group at either the terminal of the molecule or inside the molecule, and may have either a linear or branched structure. From the viewpoint of stability, α-olefins having an unsaturated group at the molecular end are particularly preferable. Among the α-olefins, those having a boiling point of 200 to 350 ° C. include linear α-olefins having 12 to 20 carbon atoms, and particularly preferable are linear α-olefins having 14 to 18 carbon atoms. is there.

The (C) functions to facilitate handling of the plastisol composition in the molding process and to improve the quality of the molded product, and avoids deterioration of the physical properties of the resin of the molded product after molding. Therefore, it is desirable that the resin does not remain in the resin as much as possible. Therefore, the boiling point of (C) is usually 200 to 350 ° C., preferably 230 to 320.
℃. If the boiling point is less than 200 ° C, it volatilizes rapidly during molding, causing deterioration of quality such as craters in the molded product, and if it exceeds 350 ° C, a large amount remains in the resin after molding and the physical properties of the molded product are deteriorated. It is not preferable because it causes a decrease.

The amount of (C) is usually 1 to 100% by weight, preferably 2 to 25% by weight, based on the total weight of (A) and (B). If it is less than 1% by weight, the effect of reducing the viscosity of plastisol is poor, and if it exceeds 100% by weight, it remains in a large amount in the resin after molding and the physical properties of the molded product deteriorate.

The plastisol composition of the present invention may optionally contain a filler (D). Examples of (D) include inorganic fillers (eg, calcium carbonate, talc, kaolin, silica, etc.) and organic fillers (eg, cellulose powder, powdered rubber, reclaimed rubber, etc.).
You may use these 2 or more types together.

If desired, various additives such as a stabilizer, a coloring agent or an adhesiveness-imparting agent may be further added. Stabilizers include metallic soaps (eg calcium stearate, stearic acid etc.), inorganic acid salts (eg dibasic phosphite, dibasic sulphate etc.) and organometallic compounds (eg dibutyltin dilaurate, dibutyltin malate etc.) Is mentioned.
Examples of the colorant include organic pigments, inorganic pigments, dyes and the like. Examples of the adhesiveness-imparting agent include thermosetting phenol resin, block NCO type urethane resin, and epoxy resin. In addition to these, a foaming agent, a flame retardant, a release agent, an antifoaming agent, etc. can be added depending on the purpose.

In the plastisol composition of the present invention, the proportion of each component is not particularly limited, but an example of the formulation is as follows (unit is% by weight). Usually preferably vinyl chloride (co) polymer (A) 10-50 (20-40) plasticizer (B) 10-50 (20-40) viscosity reducer (C) 1-20 (3-10) filling Agent (D) 0-70 (0-60)

Since (C) can be easily mixed with plastisol, the method of addition is not particularly limited, but it is added to the plastisol after its preparation, the method during the preparation of plastisol, the plasticizer, etc. The method of making plastisol can be applied. An ordinary high-viscosity kneading tank such as a planetary mixer is used for compounding.
The temperature at the time of compounding is usually 50 ° C or lower.

[0014]

The present invention will be described in more detail with reference to the following examples, but the present invention is not limited thereto. Parts in the examples indicate parts by weight. Example 1 The following components were charged in a planetary mixer and kneaded at room temperature for 1 hour to obtain plastisol. Vinyl chloride resin 100 parts (Sumitomo Chemical Co., Ltd. Summit PX-U, average degree of polymerization 3
000) Dioctyl phthalate 110 parts 1-hexadecene 5 parts Calcium carbonate 150 parts Calcium stearate 2 parts Zinc stearate 2 parts The obtained plastisol is coated on a steel plate to a thickness of 0.5 mm using a knife coater, It heated for 5 minutes in a 150 degreeC heating furnace. Then, after heating in a heating furnace at 250 ° C. for 3 minutes, it was cooled to obtain a coating film. The surface quality was good and the film thickness was constant. Further, when the coating film was cut and observed, the cross section was uniform.

Example 2 The following components were charged in a planetary mixer and kneaded at room temperature for 1 hour to obtain plastisol. Vinyl chloride resin 100 parts (Sumitomo Chemical Co., Ltd. Summit PX-U, average degree of polymerization 3
000) Dioctyl phthalate 50 parts 1-tetradecene 5 parts Calcium carbonate 20 parts Calcium stearate 2 parts Zinc stearate 2 parts The obtained plastisol is coated on a steel plate to a thickness of 0.3 mm using a knife coater, It heated for 5 minutes in a 150 degreeC heating furnace. Then, after heating in a heating furnace at 250 ° C. for 3 minutes, it was cooled to obtain a coating film. The surface quality was good and the film thickness was constant. Further, when the coating film was cut and observed, the cross section was uniform.

Example 3 A planetary mixer was charged with the following components and kneaded at room temperature for 1 hour to obtain a plastisol. Vinyl chloride resin 100 parts (Mitsubishi Monsanto Chemical Vinyl Vinyla R-1080, average degree of polymerization 4000) Dioctyl phthalate 80 parts 1-octadecene 5 parts Calcium carbonate 100 parts Calcium stearate 2 parts Zinc stearate 2 parts The obtained plastisol is knife-coated. It was applied onto a steel plate to a thickness of 0.3 mm and heated in a heating furnace at 150 ° C. for 5 minutes. Then, after heating in a heating furnace at 250 ° C. for 3 minutes, it was cooled to obtain a coating film. The surface quality was good and the film thickness was constant. Further, when the coating film was cut and observed, the cross section was uniform.

Comparative Example 1 Mineral spirits (boiling point 1
A plastisol was prepared in the same manner as in Example 3 except that (30 to 155 ° C.) was used, and the same operation as in Example 1 was performed to obtain a coating film. This surface quality has craters,
It was bad. Further, when the coating film was cut and observed, many voids were generated in the cross section.

Comparative Example 2 A plastisol was prepared in the same manner as in Example 1 except that 1-hexadecene was not added. An attempt was made to coat this product on a steel plate with a knife coater, but a coating film having a uniform film thickness could not be obtained due to the high viscosity of the resin.

[0019]

EFFECT OF THE INVENTION The plastisol composition of the present invention has a low viscosity and is easy to handle, especially in plastisols using a vinyl chloride resin having a high degree of polymerization and a small amount of a plasticizer, and craters are generated even at high temperature molding. An excellent molded product can be obtained without deterioration of quality.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Ryuichi Ito 1-11, Hitotsubashi-honmachi, Higashiyama-ku, Kyoto Sanyo Chemical Industry Co., Ltd.

Claims (4)

[Claims] 1. A plastisol composition comprising a vinyl chloride (co) polymer (A), a plasticizer (B), a viscosity reducing agent (C) and optionally a filler (D), wherein the viscosity reducing agent (C) ) Is an aliphatic hydrocarbon having a boiling point of 200 to 350 ° C., a plastisol composition. 2. The plastisol composition according to claim 1, wherein the viscosity reducing agent (C) is an unsaturated aliphatic hydrocarbon having a boiling point of 200 to 350 ° C. 3. The plastisol composition according to claim 1 or 2, wherein the viscosity reducing agent (C) is an α-olefin having a boiling point of 200 to 350 ° C. 4. The amount of the viscosity reducing agent (C) is 1 to 100% by weight based on the total weight of the vinyl chloride (co) polymer (A) and the plasticizer (B). The described plastisol composition.