JP2012116988A - Solvent for use in coating material, and manufacturing method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide such a solvent for use in coating materials as does not degrade a solvent power to synthetic resins, has coating properties and quick-drying, and also availability corresponding to legislative change, and is a very little bad influence on the human bodies and the environments; and to provide a method for manufacturing it.SOLUTION: This solvent for use in coating materials is formed by using as the raw material preferably a kerosine fraction, by using as the principal ingredient a low-boiling point isoparaffin having a boiling point of 120-200°C, and by adding thereto glycol ether.

Description

  The present invention relates to a paint solvent and a method for producing the same, and more particularly to a paint solvent used for synthetic resin paints and having little influence on the human body and the environment and a method for producing the same.

  In recent years, various types of paints have been used regardless of whether they are industrial or household use. With the expansion of the range of use, in addition to the requirements in use for the characteristics of the paint or the characteristics of its solvent, social restrictions have been imposed. ing. Specifically, paints that have a coating property, heat resistance, or weather resistance corresponding to the object to be painted, ease of painting, shortening the drying time after painting, or paints or solvents that have little impact on the human body or the environment And so on, the requirements vary. Paints are generally classified into water-based paints, oil-based paints, synthetic resin paints, and the like. Among them, as a paint having a short drying time, a synthetic resin paint is frequently used, and a thinner often used as a solvent is required to have a quick drying property.

  These paint thinners are used in applications such as diluting and washing oil-based paints commonly called paints, but can also be diluted with paint thinners, such as one-component and two-component urethane paints and epoxy paints. It is often used for dilution, washing, etc. In general, paint thinners are often used as petroleum hydrocarbon mixtures containing a large amount of aromatic hydrocarbons such as mineral terpenes. Aromatic hydrocarbons typified by xylene have strong dissolving power and moderate drying properties, making them suitable for paint thinners, but these aromatic hydrocarbons have recently been found in sick houses and the like. Toxicity has attracted attention, and the Law Concerning the Release of Specific Chemical Substances into the Environment and the Promotion of Improvements in Management (hereinafter referred to as the PRTR Law), the solvent poisoning prevention regulations (hereinafter referred to as “ Machine law "hereinafter) and, by the respective local regulations, etc., are managed use and emissions, reduction of environment outflow has been promoted. Therefore, paint solvents using these aromatic hydrocarbons are also subject to these laws and regulations, and their use has been significantly restricted. " (For example, see Patent Document 1)

  For this reason, “a paint solvent that retains paint solubility and drying properties, has fewer laws and regulations than conventional paint thinners, and has less adverse effects on the human body and the environment even though it contains almost no aromatic hydrocarbons. ”And new development products are proposed. Specifically, “a coating solvent having one or two or more aliphatic hydrocarbons and an ester-modified glycol ether derivative, wherein the aliphatic hydrocarbon is preferably composed of normal paraffin, isoparaffin and naphthene. One or two or more selected ester-modified glycol ether derivatives, a coating solvent having a configuration in which the glycol ether portion is propylene glycol monoalkyl ether and the ester portion is acetic acid or propionic acid "(for example, Patent Documents) 1) is proposed.

JP 2006-022149 A

However, such paint solvents or conventional paint solvents require many qualities and characteristics as well as universal characteristics such as paintability, quick-drying, and safety, and each has several problems. Furthermore, in addition to the above-mentioned legal and environmental problems, the following problems and problems may occur.
(I) In the case where the component of the solvent for paint or a part thereof is limited to a specific chemical substance, the requirement for a wide range of uses is limited not only in terms of cost but also in terms of quantitative securing or application range. There was a case that could not cope with. Especially in the case of special specific chemical substances, this is a big problem.
(Ii) The PRTR Law and Organic Laws may be revised due to the discovery of new environmental and human impacts and social demands. Even for paint solvents, due to the application of such amendments, certain solvents, reagents or chemicals that could be used in the past may not be used, making it difficult to use solvents that can be used as substitutes. is there. Specifically, aromatic hydrocarbons such as benzene, toluene, and xylene, which have been used as main solvents for all thinners, and alkylbenzenes recently became the target substances.
(Iii) Among coating solvents, solvents produced by using by-products, surplus products, waste treatment substances, etc. generated in conventional petroleum refining processes, chemical processes, industrial product manufacturing processes, etc. There is a solvent using this. In such a case, a situation such as a change in the amount of the raw material obtained due to a change in the production amount or a stop of the raw material acquisition due to a change to a new process may occur, and a solvent that can be used as an alternative may be difficult.

  The object of the present invention is as a solvent mainly used for synthetic resin paints, without lowering the dissolving power to the synthetic resin, having paintability and quick-drying, available in response to changes in laws and regulations, etc. An object of the present invention is to provide a coating solvent having a little adverse effect on the environment and a method for producing the same.

  As a result of intensive studies, the present inventors have found that the above object can be achieved by the following solvent for paint and a production method thereof, and have completed the present invention.

The solvent for paints according to the present invention is characterized in that a low-boiling isoparaffin having a boiling point of 120 ° C. to 200 ° C. is used as a main ingredient, and glycol ether is added thereto.
As described above, there are many problems with paint solvents used in synthetic resin paints. At this time, it is possible to respond to individual problems by selecting an organic solvent having characteristics that meet the specific requirements of each, but as described above, selection of alternative solvents such as laws and regulations, It has unprecedented difficulties, including economic conditions. The present inventor examined not only the characteristics of various inorganic or organic solvents but also the feasible aspects (domestic production facilities and overseas market trends) including their productivity and applications, and the solvent for paints used in synthetic resin paints. As a result, it has been found that it is possible to produce a solvent having a very high dissolving power, which can be obtained in response to changes in paintability and quick-drying regulations, and has little adverse effects on the human body and the environment. Specifically, by selecting a low-boiling isoparaffin as the main agent and preparing a solvent in which glycol ether is added thereto, these various characteristics can be secured. As used herein, “low boiling point” refers to a material property having a boiling point of about 200 ° C. or lower.

The present invention is the paint solvent, wherein the low-boiling isoparaffin is a distillation component having a boiling point of 120 ° C. to 200 ° C. using a kerosene fraction as a raw material.
As the low-boiling isoparaffin, it is possible to use a simple component such as a solvent composed of isodecane (boiling point 168 ° C.) or a mixture of several simple components, but the kerosene fraction is mainly composed of a low-boiling isoparaffin. Therefore, when the applicability of the mixture with glycol ether as a solvent for paints was verified, it was confirmed that the mixture had a characteristic capable of sufficiently achieving the object of the present application. In addition, using such commonly used products as raw materials is advantageous in terms of cost and availability. The “kerosene fraction” as used herein is a distillation that has a quality that conforms to, for example, JIS K2203 (2009) and that does not substantially contain aromatic hydrocarbons so as not to violate the above-mentioned laws and regulations after distillation. Ingredients.

The present invention is the paint solvent, wherein the glycol ether is a cellosolve or propylene glycol ether.
As described above, the present inventors have found that glycol ether is very suitable as a reagent having the same function as a conventional aromatic hydrocarbon having a high affinity for a paint in a paint solvent. In the present invention, as a result of verifying a reagent capable of securing a higher solubility of the paint among them, cellosolve such as butyl cellosolve (ethylene glycol monobutyl ether, boiling point 172 ° C.) or propylene glycol monomethyl ether (PM, boiling point 121 ° C.). It was found that a propylene glycol ether system such as

The present invention is the above-mentioned coating solvent, characterized in that it contains about 65 to 70% of the low boiling point isoparaffin and about 30 to 35% of the glycol ether.
Of the above properties required for paint solvents, the main properties of paint solubility and quick drying depend on the composition of the solvent. In the present invention, it was found from the relationship with the characteristics of the synthetic resin paint used that it is preferable for the two reagents to be in this range in order to further improve the solubility and quick drying property.

The method for producing a solvent for paint according to the present invention includes the following steps.
(1) Step of distilling kerosene and taking out a fraction at 120 to 200 ° C. (2) Step of preparing a solvent for coating by adding about 30 to 35 parts by weight of glycol ether to about 65 to 70 parts by weight of the above fraction As shown in the figure, the kerosene fraction contains a large amount of low-boiling isoparaffin, which can be used as a solvent for paints. Can be used as a raw material supply source. In the present invention, as a method for producing a solvent for paint, the final glycol ether process is determined from the acquisition of kerosene as a raw material, and these main processes are clarified.

The whole block diagram which illustrates the manufacturing method of the solvent for coating materials which concerns on this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. The solvent for paints according to the present invention is characterized by comprising a low-boiling isoparaffin having a boiling point of 120 ° C. to 200 ° C. as a main ingredient and adding glycol ether thereto. As a solvent mainly used in synthetic resin paints, it has paintability and quick-drying properties without compromising its ability to dissolve the synthetic resin, is available in response to changes in laws and regulations, and has little adverse effects on the human body and the environment. Can constitute paint solvent

  Here, the coating solvent of the present invention preferably contains about 65 to 70% of low boiling point isoparaffin and about 20 to 30% of glycol ether. By preparing a solvent in such a range, it can be used as a solvent for paints with higher solubility and quick drying. That is, when the component ratio of the low boiling point isoparaffin is increased to 70% or more, the ratio of the glycol ether having a high dissolving function is decreased. Conversely, when the component ratio of the low boiling point isoparaffin is decreased to 65% or less, There is a possibility that the dissolving function becomes high and the quick drying property is lowered due to re-dissolution of the paint during drying. In addition, for example, in the case where the same part is repeatedly applied several times, such as for architectural coating, it is necessary to perform recoating without damaging the underlying coating film. If it becomes too high, dissolution or unevenness of the underlying coating film may occur.

<Low boiling isoparaffin>
A low boiling isoparaffin having a boiling point of 120 ° C. to 200 ° C. is used as a main agent of the solvent for paint according to the present invention. The boiling point of a solvent that can be used as a coating solvent is preferably 120 ° C. or higher, more preferably 150 ° C. or higher, in view of the stability of the coating before use. On the other hand, since quick drying is required, 220 ° C. or lower is preferable, and 200 ° C. or lower is more preferable. Here, as described above, paraffinic hydrocarbons are preferable in consideration of applicability of the method, stability as chemical substances, safety, or availability. Further, when the availability of the solvent is further verified, for the linear normal paraffin solvent that is a petrochemical industry product, it is easy to obtain a specific hydrocarbon having a boiling point of 120 ° C. or less, such as n-octane, A hydrocarbon having a boiling point of 120 ° C. or higher is not easily available because its use is limited. In addition, the solubility of synthetic resins tends to be higher for hydrocarbons with higher carbon numbers and higher boiling points. When comparing normal paraffinic hydrocarbons and isoparaffinic hydrocarbons with the same carbon number, the latter has a higher boiling point. There is a low tendency. For example, isodecane 167 ° C. with respect to normal decane 174 ° C., normal octane 126 ° C., isooctane 99 ° C. and the like can be mentioned. On the other hand, isoparaffinic hydrocarbons are very easy to obtain because they are the main components of the kerosene fraction as will be described later. In the present invention, isoparaffin hydrocarbons are selected as a coating solvent in consideration of such characteristics, actual usage, and future availability. In addition, at this time, it is possible to use a solvent composed of a specific component such as isodecane, but even if a composite component such as a kerosene fraction described later is used, the object of the present invention can be sufficiently achieved. I was able to confirm.

  Here, as the low boiling point isoparaffin, it is preferable to use a distillation component having a boiling point of 120 ° C. to 200 ° C. using a kerosene fraction as a raw material. The kerosene fraction is usually a distillation component purified from petroleum or reformed oil and having a boiling point of 160 ° C. to 270 ° C. mainly composed of isoparaffin. As a commercially available liquid fuel, it is a reagent that can be obtained in large quantities and very close, and it is used as a petroleum-based organic solvent in many applications. Therefore, by distilling the kerosene fraction and taking it out at a boiling point of 120 ° C. to 200 ° C. as a low boiling point component, the low boiling point isoparaffin can be constituted and used as a coating solvent for a mixture with glycol ether. It was. By using these commonly used commodities as raw materials, it has become possible to easily obtain them at low cost while ensuring the desired characteristics.

  Examples of the low-boiling isoparaffin having a boiling point of 120 ° C. to 200 ° C. in the present invention include, for example, isononane (boiling point about 150 ° C.), isodecane (boiling point about 170 ° C.), isoundecane (boiling point about 190 ° C.), isododecane (boiling point about 180 ° C.). ° C), 2-methylundecane, 2,10-dimethylundecane and the like. These isoparaffins may be used alone or in combination of two or more. Furthermore, you may use as a hydrocarbon mixture which contains one or more types of these aliphatic hydrocarbons as a main component.

<Glycol ether>
Glycol ether is added to the paint solvent according to the present invention. By adding glycol ether, it has the same function as conventional aromatic hydrocarbons, etc., has affinity with low-boiling isoparaffin, and ensures high solubility of synthetic resin paint, It is possible to deal with changes and the like. The glycol ether that can be used is not particularly limited, but those having a boiling point similar to that of isoparaffin are preferred because quick drying is required. Specifically, cellosolve or propylene glycol ether is preferable.

  Cellosolve glycol ethers include, for example, ethylene glycol monomethyl ether (methyl soloselve, boiling point 125 ° C.), ethylene glycol monoethyl ether (ethyl soloselve, boiling point 136 ° C.), ethylene glycol monoisopropyl ether (boiling point 141 ° C.), ethylene Glycol monopropyl ether (boiling point 150 ° C.), ethylene glycol monobutyl ether (butyl cellosolve, boiling point 172 ° C.), ethylene glycol monoisobutyl ether (boiling point 160 ° C.), diethylene glycol dimethyl ether (boiling point 162 ° C.), diethylene glycol diethyl ether (boiling point 189 ° C.), Diethylene glycol monomethyl ether (boiling point 194 ° C.), diethylene glycol monoethyl ether (boiling point 202 ° C.), diethylene glycol Call n-butyl ether (boiling point 231 ° C.), triethylene glycol monomethyl ether (boiling point 249 ° C.), and the like.

  Propylene glycol ethers include propylene glycol methyl ether (PM, boiling point 121 ° C.), propylene glycol monoethyl ether (boiling point 132 ° C.), propylene glycol normal propyl ether (boiling point 150 ° C.), propylene glycol isobutyl ether (boiling point 157 ° C), propylene glycol normal butyl ether (boiling point 170 ° C), 3-methoxy-3-methyl-1-butanol (MMB, boiling point 174 ° C), dipropylene glycol dimethyl ether (boiling point 175 ° C), dipropylene glycol methyl ether (boiling point 190) ° C), dipropylene glycol normal propyl ether (boiling point 212 ° C), dipropylene glycol normal butyl ether (boiling point 229 ° C), and the like.

  Among these glycol ethers, butyl cellosolve (ethylene glycol monobutyl ether) and PM (propylene glycol methyl ether) are preferable from the viewpoint of the dissolving power and cost of the paint. In particular, butyl cellosolve has a drying function close to that of isoparaffin and has the same drying function, and is also used as a second petroleum in the Fire Service Act that meets the above-mentioned laws and regulations, for lacquers, resin solvents, viscosity modifiers, printing inks, liquid detergents, etc. It is more preferable because it is easily available.

<Method for manufacturing the bag>
The method for producing a solvent for paint according to the present invention (hereinafter referred to as “the present production method”) includes the following two main steps.
(1) Step of distilling kerosene and taking out a fraction at 120 to 200 ° C. (2) Step of preparing a solvent for coating by adding about 30 to 35 parts by weight of glycol ether to about 65 to 70 parts by weight of the fraction First, the solvent for paint according to the present invention is prepared by the following steps using kerosene and glycol ether as raw materials. The case where butyl cellosolve is used as the glycol ether will be described along the process illustrated in FIG.

(1) Step of distilling kerosene and taking out a fraction at 120 to 200 ° C. The step of taking out a fraction at 120 to 200 ° C. is specifically composed of the following steps as shown in FIG.
(1-1) Kerosene (boiling point 160 to 270 ° C.) as a process raw material for preparing a predetermined amount (for example, 10,000 L) of kerosene is specified as long as the quality conforming to, for example, JIS K2203 (2009) is ensured. There is no question of what is supplied from the oil refining process of this company or what is commercially available. Commercial kerosene contains almost no aromatic hydrocarbon, but even if it is contained, what is not contained as a distillation component at 200 ° C. or lower can be used.
(1-2) The process distillation apparatus (distillation tower) for introducing kerosene into the lower part of the distillation apparatus in a liquid state at room temperature is not limited in scale and configuration, but generally, a reboiler is provided in the lower part of the tower, and about 200 Kerosene heated to about ℃ is vaporized and rises to the top of the distillation column, and a condenser and a condensate take-out portion are provided at the top of the upper portion of the distillation column. The following fractions are condensed and stored in the condensate outlet.
(1-3) Step for taking out a distilled component at 120 to 200 ° C. The fraction stored in the condensate take-out portion is taken out of the tower continuously or batchwise. At this time, most of the distillation components have a boiling point of 160 to 200 ° C., but when the raw material contains a fraction of 150 ° C. or less as an azeotropic mixture, it is included as the main distillation component. In addition, since a fraction of 200 ° C. or higher and a part of the fraction of 200 ° C. or lower that has fallen as a condensate remain in the lower part of the column, the residual liquid is circulated in the upper part of the distillation tower, A fraction of 200 ° C. or less can be taken out efficiently.

(2) Step of preparing a coating solvent by adding glycol ether to the fraction Next, about 30 to 35 parts by weight of glycol ether is added to about 65 to 70 parts by weight of the fraction to prepare a coating solvent. In detail, it is based on the following processes (refer FIG. 1).
(2-1) Step of preparing glycol ether For example, a predetermined amount (for example, 5,000 L) of butyl soloselve is prepared. As the butyl soloselve to be prepared, the above-described reagents used for lacquers and the like can be used.
(2-2) Step of adding glycol ether to kerosene fraction The prepared butyl soloselve is introduced into a predetermined container into which the kerosene fraction of (1-3) has been introduced. The introduction amount at this time is about 30 to 35 parts by weight of glycol ether with respect to about 65 to 70 parts by weight of the fraction. The mixing ratio is adjusted according to the specifications of the synthetic resin used.
(2-3) A step of stirring the mixed reagent in the container and preparing a uniformly mixed solvent for the paint. These operations are carried out by batch-wise, for example, introducing each reagent introduced in the container having a capacity of about 20,000 L. Can be processed. Further, it can be continuously introduced into a container having a smaller capacity and continuously processed. At this time, if there is heat generated by the mixing, the container is cooled so that the evaporation of the reagent and the accompanying change in the mixing ratio do not occur.

  The paint solvent produced by the above steps is poured into a tank having a predetermined capacity and mixed with a synthetic resin material corresponding to the specifications to produce a desired paint.

Claims (5)

  A coating solvent comprising a low-boiling isoparaffin having a boiling point of 120 ° C. to 200 ° C. as a main ingredient and a glycol ether solvent added thereto.   The coating solvent according to claim 1, wherein the low-boiling isoparaffin is a distillation component having a boiling point of 120 ° C to 200 ° C using a kerosene fraction as a raw material.   3. The paint solvent according to claim 1, wherein the glycol ether is a cellosolve or propylene glycol ether.   The solvent for paint according to any one of claims 1 to 3, comprising about 65 to 70% of the low-boiling isoparaffin and about 30 to 35% of the glycol ether. The manufacturing method of the solvent for coating materials characterized by including the following processes.
(1) A step of distilling kerosene and taking out a fraction at 120 to 200 ° C. (2) A step of preparing a solvent for coating by adding about 30 to 35 parts by weight of glycol ether to about 65 to 70 parts by weight of the fraction.

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