JPH10219291A - Aqueous resin treating agent - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain the subject treating agent capable of reducing both the concentration of limonene and the cost and well dissolving a resin or an oil even at a low concentration of the limonene by forming an emulsion from the limonene, water and a specific surfactant. SOLUTION: This treating agent is obtained by forming an emulsion from limonene, water and one or more surfactants selected from the surfactant group represented by the formula (x) and (y) are each an integer of >=0 and satisfies conditions of 3<=[(x)+(y)]<=15; R is an 8-20C linear/branched fatty acid residue}. A monococonut oil fatty acid polyoxyethylene glyceryl is low toxic and preferred as the surfactant represented by the formula. The objective treating agent can be utilized as a detergent for resins, etc., sticking to the surfaces of mechanical products, etc. When the treating agent is used, safe operations can be performed at the time of treating operations to prevent environmental pollution.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention can be used in the field of removing adhering oil and resin by washing or the like, and in the field of using resin by dissolving resin such as styrene foam.

[0002]

2. Description of the Related Art According to the prior art, for example, chlorofluorocarbon has been used as a treating agent for decomposing and removing oils and resins adhering to the surface of machine products. As a substance that destroys the ozone layer and creates an ozone hole, international regulations are in place, and this fluorocarbon is no longer used. In addition, 2-bromopropane has been used as an alternative to chlorofluorocarbons, but this substance is harmful to the human body and may adversely affect the health of workers.

Further, in order to solve the above-mentioned drawbacks of the prior art, among terpenes, particularly limonene, which is a kind of monoterpene, is a biodegradable resin which is safe for the human body. There is an oil-based treating agent to which limonene is added, utilizing the knowledge that it decomposes into lignene (JP-A-8-85734). However, with this oil-based treating agent, limonene is entirely responsible for dissolving the resin such as polystyrene.If the limonene is not concentrated at a high concentration, the resin cannot be dissolved efficiently. For example, since limonene is derived from citrus fruits and is usually not chemically synthesized, the price may be high depending on the quality of the citrus, and the dissolving agent itself is expensive. .

[0004] Apart from the above, Japanese Patent Laid-Open No.
No. 298992, “Polystyrene dissolving agent, polystyrene treatment method and apparatus”, limonene, linear alkylbenzene sulfonate, alcohol ethoxylates,
Alkyl succinates, fatty acid ethanolamides,
Mixtures with surfactants such as ethoxylated alkylphenols are disclosed. It should be noted that from the description of the examples here, this mixed solution is composed only of limonene and a surfactant, and when a resin or the like is dissolved, an emulsion is formed by adding a polar solvent such as water to the emulsion. Does not disclose the concept of dissolving resin or the like.

[0005] When a polar solvent such as water is added to the mixture, an emulsion can be formed and the limonene concentration can be reduced. However, the above-mentioned surfactant is used for the purpose of separating into two layers of a layer containing polystyrene at a high concentration and a layer containing polystyrene at a low concentration when the solution is allowed to stand after dissolving the polystyrene. It has low permeability to oils and resins and cannot promote the dissolution of limonene in resins. For this reason, when a polar solvent such as water is added to the mixture to form an emulsion and the concentration of limonene is reduced, there is a problem that a resin such as polystyrene cannot be dissolved well.

[0006]

In view of the above circumstances, the present invention reduces the concentration of limonene to reduce the cost of the treating agent, and improves the resin and oil content even when the concentration of limonene is low. An object of the present invention is to provide a resin treatment agent that can be dissolved in water.

[0007]

Means for Solving the Problems In order to achieve the above object, the inventor of the present invention examined the prescription components of the resin treatment agent, and first formed an emulsion of limonene and water as described above. It was decided to reduce the concentration of limonene. Next, consider a surfactant that is inexpensive and highly safe, having the ability to efficiently incorporate limonene into the resin and promote the dissolution of the resin, etc., by penetrating the resin and oil well. As a result, they have found that a substance group represented by the chemical formula 1 obtained by the following chemical synthesis, particularly polyoxyethylene glyceryl monococonut fatty acid, is preferable.

Therefore, the basic constitution of the resin treating agent of the present invention is such that limonene and water are formed into an emulsion by one or more kinds selected from the group of surfactants represented by the following chemical formula 1. did.

In the course of the study of the present invention, it was also found that among the surfactants represented by the following chemical formula 1, it was particularly preferable to limit to polyoxyethylene glyceryl mono-coconut fatty acid.

Embedded image

[0010]

Examples 1 and 2 As Examples of the present invention, the components shown in the formulations shown in Table 1 were prepared by the following procedures to obtain Examples 1 and 2. A mixture of limonene and polyoxyethylene glyceryl mono-coconut oil. The mixture is stirred with a stirrer while adding water little by little.

[0011]

Comparative Examples 1 and 2 In comparison with Examples 1 and 2 of the present invention, the components shown in the formulations shown in Table 2 were used as comparative examples using surfactants having low permeability to resins and the like. Comparative Example 1 was obtained. Mix triethanolamine lauryl sulfate and limonene. The mixture is stirred with a stirrer while adding water little by little.

[0012]

Comparative Examples 3 to 5 Comparative Examples 3 to 5 were prepared by mixing the components shown in Table 3 with Examples 1 and 2 of the present invention as comparative examples of oil-based dissolving agents according to the prior art. 5 was obtained.

[0013]

[Test 1] Examples 1 and 2, Comparative Examples 1 and 2, and Comparative Examples 3 to 5
Was used to evaluate the dissolving performance of polystyrene of each treating agent according to the following procedures. Table 4 shows the results. Take 50 g of each sample into a 200 cc Erlenmeyer flask and stopper tightly. The above flask is left in a 70 ° C. water bath for 30 minutes. While stirring the contents of the flask at 400 rpm, 0.1 g of styrene foam is put into the flask. The time from the foaming in the flask until the styrene was completely dissolved was measured.

As shown in Table 3, when Examples 1 and 2 were compared with Comparative Examples 1 and 2, the time required for dissolving polystyrene was much shorter in Examples 1 and 2. Was.
This means that the surfactant used in Examples 1 and 2 has higher permeability to the resin than the surfactant used in Comparative Examples 1 and 2, and at the same time as the surfactant penetrates into the resin, limonene is used. It was demonstrated that limonene can dissolve polystyrene efficiently even at a low concentration because limonene promotes dissolution of polystyrene by being efficiently incorporated into the resin. In addition, the dissolving ability was superior to Comparative Examples 3 and 4 when Comparative Examples 3 to 5 corresponding to the prior art were used, and especially when compared with Comparative Example 5 in which the limonene concentration was increased, Although the capacity is slightly lowered, the dissolution can be performed satisfactorily in consideration of the actual industrial dissolution rate.

[0015]

[Test 2] After completion of Test 1, Examples 1 and 2 and Comparative Examples 1 and 2
After taking out the stirrer used for the measurement, the treatment agent was wiped off with a dry cloth, and the degree of adhesion of polystyrene on the surface of the stirrer was examined visually and by touch to evaluate the detergency of each emulsion. The test was performed by five testers, and if adhesion was felt, and it was seen, 0 points, if adhesion was felt or seen, or 1 point,
A case where no adhesion is felt and the case where no adhesion is observed is evaluated as a two-point scale, and a three-point evaluation is performed.
If it is more than the point, the washability is good. If it is 7 to 6, the washability is normal. If it is less than 5, the washability is poor. (Results of Test 2) * Example 1 → good washability * Example 2 → good washability * Comparative Example 1 → poor washability * Comparative Example 2 → poor washability

Test 2 shows that in Examples 1 and 2, polystyrene molecules dissolved / dispersed by limonene are quickly taken into the emulsion and dispersed during the treatment. From this, the treating agent of the present invention is not only used for the purpose of simply decomposing the resin or oil component, but also prevents the decomposed resin or the like from re-adhering to the surface after decomposing the resin or the like attached to the surface. Can be removed. In other words, it has been proved that it can also be used as a cleaning agent for the resin or oil attached to the surface.

[0017]

As the treating agent of the present invention uses a surfactant having a high permeability to resin and oil, when the surfactant penetrates from the resin surface to the inside, the treating agent of the resin or the like is removed. Limonene can be efficiently taken into the inside. For this reason, even if limonene which is a dissolving component such as a resin is at a low concentration, the resin, the oil component, and the like can be efficiently dissolved. In addition, since expensive limonene can be made to have a low concentration while maintaining excellent solubility of a resin or the like, the processing agent itself can be made low in cost, and as a result, a stable supply of a resin product becomes possible.

In the resin treating agent of the present invention, polystyrene molecules dissolved / dispersed by limonene can be quickly taken into an emulsion and dispersed in the treating agent. It can be used not only for the purpose of dissolving resin and oil, etc., but also as a cleaning agent for a resin or the like attached to the surface of a machine product or the like, and the range of application of the treatment agent can be expanded.

Further, among the surfactants to be added to the treating agent of the present invention, in particular, polyoxyethylene glyceryl monococonut fatty acid is a cosmetic raw material approved by the Ministry of Health and Welfare, and its low toxicity to the human body is guaranteed. The remaining components are also biodegradable substances. Thus, according to the resin treatment agent of the present invention, the worker can safely work during the resin treatment operation, and also can prevent environmental pollution.

Claims (2)

[Claims] 1. A resin treating agent characterized by forming an emulsion with limonene, water and one or more selected from the group of surfactants represented by the following chemical formula 1. . 2. The resin treating agent according to claim 1, wherein polyoxyethylene glyceryl monococonut fatty acid is selected from the group of substances represented by the following chemical formula 1. Embedded image