JP2787660B2 - Water repellent in aerosol container - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water repellent in an aerosol container provided with a special actuator for imparting water repellency to fibers and clothing.

[0002]

2. Description of the Related Art Conventionally, in order to impart water repellency to clothing or the like by spraying, a liquid in which a water repellent resin such as a fluororesin or a silicone resin is dissolved in an organic solvent is filled in a pressure vessel together with a propellant. An aerosol-type water repellent has been proposed and put on the market. However, the conventional aerosol type water repellent has a small spray particle size of the water repellent and a low adherence rate to clothing and textiles, and thus has an effect of imparting water repellency and product safety (inhalation toxicity). There was a problem.

[0003]

DISCLOSURE OF THE INVENTION The present invention is directed to a method for imparting water repellency to clothing and textiles, which has a high water repellency-providing effect, and which prevents spray particles from being inadvertently sucked into the human body. An object of the present invention is to provide a highly safe water-repellent agent in an aerosol container showing an adhesion rate.

[0004]

The spray actuator for an aerosol container according to the present invention has a spray nozzle having a specific structure, the spray particle diameter can be set relatively large, and particularly, a water repellent in an aerosol container. It is suitable as a jetting actuator. The water repellent in the aerosol container of the present invention uses the above-mentioned actuator, and further uses a solvent having a specific surface tension and an evaporating rate and carbon dioxide as a propellant, thereby setting a large spray particle diameter and increasing the size of clothes and fibers. The efficiency of adhesion to the surface is improved.

[0005] The aerosol type water repellent of the present invention is a water repellent which is obtained by enclosing a water repellent composition and a propellant in an aerosol container, and is contained in an aerosol container equipped with a specific spray actuator. The composition has a surface tension at 20 ° C. of not less than 21 dyne / cm and butyl acetate of 100%.
It is composed of a liquid in which a water-repellent resin is dissolved in a non-halogen solvent having an evaporation rate of 300 or more, and carbon dioxide gas as a propellant reduces the internal pressure of the aerosol container to 2.5 to
The injection port of the actuator is filled and filled at 5.5 kg / cm ² , and the injection port of the actuator has a small-diameter portion formed on the aerosol container side, and a bulging portion continuously provided from the small-diameter portion toward the atmosphere. Wherein the ratio a / b of the diameter b of the small diameter portion to the diameter a of the enlarged diameter portion is in the range of 1.1 to 1.7.

[0006]

DETAILED DESCRIPTION OF THE INVENTION FIG. 1 shows a jetting actuator for an aerosol container according to the present invention. FIG. 2 is a front view of the water repellent in the aerosol container with the actuator fitted therein, with a partial cross section. As shown in FIG. 2, the aerosol container includes a pressure container 13, a mounting cap 15 for sealing an upper opening of the pressure container 13, and a valve member (a main body does not appear in the drawing) which is enclosed in the mountain cap 15. 1 that constitutes a part and controls opening / closing of a valve member by sliding up and down with respect to an actuator.
7. Injection actuator 11 fitted to stem 17
When the actuator 11 is pressed down with a finger, the stem 17 is lowered, and the water-repellent composition in the pressure vessel 13 is ejected from the stem 17 by the pressure of the propellant. 31
Are sprayed as spray particles.

The actuator 11 comprises an actuator body 21 made of synthetic resin and an injection unit 23 also made of synthetic resin.
1 forms an injection port 31, and the water repellent composition is injected via a path indicated by an arrow in FIG.
That is, the cylindrical portion of the actuator 21 and the injection unit are
The fuel is injected through the space in the cylinder of the gate 23.

The injection port 31 has a small diameter portion 3 on the pressure vessel 13 side.
3 and a swollen portion 35 connected to the small-diameter portion 33 toward the atmosphere and having a larger diameter than the small-diameter portion. The sprayed water-repellent composition is narrowed at the small-diameter portion 33 and then swollen. The pressure is released to a certain extent in the section 35 and finally released to the atmosphere and ejected to the outside of the actuator 11 to obtain appropriate spray particles.

At this time, it is important to set the size of the small diameter portion 33 and the enlarged diameter portion 35, and the ratio of the diameter b of the small diameter portion 33 to the diameter of the enlarged diameter portion a is a / b = 1.1. -1.7, preferably a / b = 1.3-1.5. When the ratio a / b is less than 1.1, the contents such as the water repellent are not sprayed in the form of a mist, whereas when the ratio a / b exceeds 1.7, the spray particle diameter becomes small, which is not preferable. In addition, the diameter b of the small diameter portion 33 is equal to 0.3.
The diameter is preferably from 3 to 0.7 mm, and the diameter a of the expanded portion is preferably from 0.4 to 1.3 mm.

The pressure vessel 13 is filled with a liquid water repellent composition (stock solution) and a propellant. The water repellent composition contains a water repellent resin and an organic solvent as essential components, and may further contain other optional components such as a whitening inhibitor such as hexylene glycol and a fragrance. Any water-repellent resin can be used as long as it imparts water-repellency to fibers and clothing, but it is desirable to mix one or more of a fluororesin and a silicone resin.

The water-repellent resin is contained in the water-repellent composition in an amount of 0.1 to 0.1%.
It is preferable to mix 4% by weight. As the organic solvent, a non-halogen organic solvent having a surface tension at 20 ° C. of 21 dyne / cm or more and an evaporation rate at 20 ° C. of butyl acetate of 100 or more is used. The surface tension of the organic solvent is 21 dyne
/ Cm is not preferable because the spray particle size becomes small. On the other hand, when the evaporation rate is less than 300, the drying property of the spray diameter decreases, and it takes time to develop the water repellent effect, which is not preferable.

An organic solvent satisfying the above characteristics and usable in the present invention is ethanol (a surface tension at 20 ° C. of 2).
3 dyne / cm, evaporation rate 340), 2-propanol (surface tension 21 at 20 ° C., evaporation rate 300). The organic solvent of the present invention contains 90% in the water repellent composition.
It is preferable to mix ９９99.9% by weight. In the present invention, carbon dioxide is used as a propellant. If a liquefied gas such as LPG is used as a propellant, it is not preferable because the particles become small when the liquid evaporates after the injection, or the spray particles become small.

The carbon dioxide gas is used in such an amount that the internal pressure of the pressure container 13 (aerosol container) becomes 2.5 to 5.5 kg / cm ² .
The pressure vessel is filled together with the water repellent composition. When this pressure is less than 2.5 kg / cm ² , atomization does not work well especially at low temperature use. On the other hand, when the pressure is 5.5 kg / cm ² or more, the pressure is too high, so that the spray particles become finer and the adhesion rate decreases, which is not preferable.

[0014]

The water repellent in the aerosol container of the present invention comprises:
By using a specific actuator in which the diameter ratio between the small diameter portion forming the injection port and the expansion portion connected thereto is suppressed, and further adjusting the surface tension and evaporation rate of the solvent of the water repellent composition, the spray particles are formed. Has a moderately large diameter and can efficiently perform a more efficient water-repellent treatment with good adhesion efficiency to a processed object such as clothing.

[0015]

The present invention will be described in more detail with reference to the following examples. Prior to this, the evaluation method used in each embodiment will be described. (1) Evaluation method of spray state After the sample filled in the aerosol container is stored at 15 ° C. for 30 minutes or more, it is sprayed at room temperature for 10 seconds, and the state of the fog is visually determined according to the following criteria. Judgment standard ○: It becomes mist-like ×: It does not become mist-like

(2) Average Particle Size of Sprayed Particles A sample filled in an aerosol container is stored at 15 ° C. for 30 minutes or more, and then at room temperature using a particle size analyzer (LDSA-1300A type, manufactured by East Japan Research Co., Ltd.). Injection distance 15c
Measure in m. The measurement is repeated three times and evaluated from the average particle diameter according to the following criteria. Criteria ◎: Particle size of 120 μm or more ○: Particle size of 119 to 100 μm △: Particle size of 70 to 99 μm ×: Particle size of 69 μm or less

(3) Measuring method of adhesion rate After previously spraying an unused sample for 1-2 hours, 15 ±
Immerse in 0.5 ° C. for 30 minutes. As shown in FIG. 3, the adhesiveness measuring device 43 is fixed on the direct balance 41. The adhesion measuring device 43 includes a base 45, a back side presser 47, a front side presser 49, and a panel 51 fixed thereto. Filter paper cut into 300 mm x 300 mm
1 and the weight is measured by the direct reading balance 41, and this is defined as the panel weight P ₁ before injection (unit: g). At this time, the balance 41 is protected from the medicine.

Preliminary sample (water repellent 1 in aerosol container)
0) is measured and the sample weight W ₁ before injection is measured (unit: g).
In this sample, the ejection direction of the actuator 21 coincides with the center of the adhesion measuring device to which the filter paper is attached, and the distance D
(See FIG. 3) is set to be 200 mm. The sample is sprayed for 5 seconds toward the panel 51 on which the filter paper is attached,
The weight indicated by the direct balance 41 to which the adhesion test device 43 is fixed is measured, and the measured value is defined as the post-ejection panel weight P ₂ (unit: g). Here, “immediately after injection” means within 10 seconds. The weight of the sample 10 after the injection was measured, and the sample weight W after the injection was measured.
₂ (unit: g). The same sample was measured three times, and three samples were performed a total of nine times.
The total average of the values determined by the above is defined as the adhesion rate.

[0019]

(Equation 1) A = Ratio of stock solution in sample

From the value of the adhesion rate (%), the adhesion rate is evaluated according to the following criteria. Judgment criteria ：: 75% or more ：: 60 to 74% ×: Less than 60%

(4) Drying property An aluminum tray (23 to 30 cm) was placed on a balance, and a 20 × 20 cm cloth (cotton broad cloth # 60) was placed in the tray, and the temperature and humidity were kept at 25 ° C. and 55% RH. Each sample is sprayed for 4 seconds in a chamber, the weight is measured over time, the time required for halving the initial weight is measured, and the evaluation is made according to the following criteria. Judgment criteria ◎: Within 1 minute ○: 2 to 10 minutes △: 19 to 11 minutes ×: 20 minutes or more

Example 1 A stock solution (water repellent composition) having the composition shown in Table 1 below was prepared.
A pressure cap is filled and sealed with carbon dioxide as a propellant by a mounting cap with a valve mechanism attached, and an actuator is fitted to the stem to produce a water repellent in an aerosol container (see FIGS. 1 and 2). The performance of these was evaluated. Stock solution composition: Fluororesin * ¹ 1% by weight Dimethylpolysiloxane (20 cS) 2% by weight Organic solvent 97% by weight (The type of solvent used is indicated by a circle in Table 1) * 1) Defensor MCF-323: Dainippon Ink and Chemicals Here, the charging pressure of carbon dioxide gas is shown in Table 3. Also,
Sample No. 12 is LP instead of carbon dioxide as propellant
G was used. The organic solvents in the stock solution composition were changed as shown in Table 3, and the characteristics of these organic solvents are shown in Table 1 below.

[0023]

Table 1: Physical properties of organic solvent Solvent name Surface tension (dyne / cm) Evaporation rate Ethanol 23 340 2-propanol 21 300 1-propanol 24 110 Hexane 18 1000 Heptane 20 386 Propylene glycol 27 70 Monomethyl ether Note) The evaporation rate is a relative value when the evaporation rate of butyl acetate is 100, and both the surface tension and the evaporation rate are values at a temperature of 20 ° C. Therefore, ethanol and 2-propanol are solvents according to the present invention, and those using other solvents in Table 1 are comparative examples which are not products of the present invention. In addition, in the case of ethanol, it is common to use vitrex or brucine-denatured ethanol as an industrial grade.

Table 2 below shows actuators.
A and B shown in Table 1 were used. Here, the actuator A is according to the present invention, while B is a comparative product out of the present invention. See FIG. 1 for a and b in Table 2.

[0025]

TABLE 2: shape actuator type using an actuator a b a / b A 0.7mm 0.5mm 1.4 B 1.3mm 0.6mm 2.2

Table 3 shows the actuator used, the solvent used, the carbon dioxide gas pressure, and the evaluation results of each sample (Sample Nos. 1 and 2).

[0027]

[Table 3]Table 3: Contents and evaluation results of water repellent in aerosol container Example Comparative example  Sample No. 1 2 3 4 5 6 7 8 9 10 11 12 Actuator A ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ B ○ Solvent used Ethanol ○ ○ ○ ○ ○ 2-propanol ○ ○ ○ 1-propanol ○ Hexane ○ Heptane ○ Propylene glycol ○ Monomethyl ether Carbon dioxide pressure (kg / cm^Two) 4.5 4.5 3.0 5.5 4.0 4.0 4.0 4.0 4.0 6.5 1.5 LPG 4kg / cm ²  Evaluation result Spray state ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ × ○ Average particle size of spray particles ◎ ◎ ◎ ○ ◎ × △ ◎ △ × − × Attachment ratio ◎ ◎ ◎ ○ ◎ × × ◎ × × − ×Drying ○ ○ ○ ○ × ◎ ○ × ○ ○ − ○

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating a configuration example of an actuator of the present invention.

FIG. 2 is a front view of a water repellent in an aerosol container according to the present invention, showing a configuration example of the water repellent in a partially sectional view.

FIG. 3 is an explanatory diagram illustrating an evaluation method used in an example of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Water-repellent agent in aerosol container 11 Actuator 13 Pressure-resistant container 15 Mountain cap 17 Stem 21 Actuator main body 23 Injection port unit 31 Injection port 33 Small diameter portion 35 Expanded diameter portion 41 Direct balance 43 Adhesion measuring device 45 Base 47 Back side pressing 49 Front side presser 51 Panel

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ identification code FI B65D 83/28 B65D 83/14 D 83/42 83/58 D06M 15/277 (58) Investigation field (Int.Cl. ⁶ , DB name) C09K 3/18 B65D 83/14 C09K 3/30 WPI / L (QUESTEL)

Claims (1)

(57) [Claims] 1. A water repellent containing a water repellent composition and a propellant enclosed in an aerosol container and provided with an injection actuator, wherein the aerosol composition has a surface tension at 20 ° C. Is 21 dyn
e / cm or more, a liquid material in which a water-repellent resin is dissolved in a non-halogen solvent having an evaporation rate of 300 or more when butyl acetate is 100, and carbon dioxide gas as a propellant reduces the internal pressure of the aerosol container. 2.
5~5.5kg / cm ² is sealed and filling so as to, and the injection port of the actuator, and a small diameter portion formed in an aerosol container side, is continuously provided toward the atmosphere side from the small diameter portion Rise A water repellent in an aerosol container, comprising a diameter portion, wherein the ratio a / b of the diameter b of the small diameter portion to the diameter a of the enlarged diameter portion is in the range of 1.1 to 1.7.