JPS6054432B2 - Glue composition for spray - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a novel spray adhesive composition, more particularly, which exhibits stable pH and viscosity over a long period of time, does not block the nozzle during spraying, and which The present invention relates to a spray adhesive composition that can provide good tension to fabrics when ironed after coating.

Recently, as a method to adjust the shape of clothes after washing, instead of the conventional method of soaking the clothes in an aqueous glue solution, spraying a water-based glue composition onto the clothes and then ironing the clothes has become more convenient. This is becoming more common.

For this purpose, various types of spray adhesive compositions are commercially available, most of which are of the aerosol type. By the way, this type of spray glue composition has the following characteristics: Even when stored for a long period of time, there is no decrease in Pll or change in viscosity due to starch hydrolysis, etc.
Property stability is required, such as not forming precipitates that cause nozzle clogging, but when modified starch such as hydroxyalkyl starch is used as a glue agent, hydrolysis due to the basic properties of the raw material glue is required. PH by
It is very difficult to avoid reductions, changes in viscosity over time or the formation of precipitates.

On the other hand, the primary purpose of spray adhesive compositions is to impart good tension to the textile fabric after application.

Up until now, as a means to meet these two demands, the combination of additives to provide stability to the glue base and additives to provide good tension has been used (Japanese Patent Application Laid-Open No. Publication No. 53-7019, Japanese Unexamined Patent Publication No. 51-9
9195, JP-A-53-4919-1, JP-A-5Q-31995, etc.).

However, in general, the large number of ingredients that are blended causes deterioration of the glue base and is also inconvenient for product quality control. This is desirable. The inventors
As a result of intensive research to develop a single material for spray adhesives that has both long-term stability and properties that provide good tension to the fabric to which it is applied, certain acrylic copolymers have been It has been found that the object can be achieved when used in combination with the base hydroxyalkyl starch, and the present invention has been completed based on this finding.

That is, the present invention provides (a) 2 to 1 weight percent hydroxyalkyl starch whose 10% aqueous solution exhibits a viscosity in the range of 10 to 100 centiboads at 25°C; and (b) 25%
The aqueous solution contains an alkali metal salt or alkanolamine salt of a copolymer of acrylic acid and methacrylic acid having a viscosity in the range of 150 to 7000 centiboise at 25°C, and the weight of component (a) and component (b) The ratio is 97 no 3
In the range of 70 to 30, with a pH of 6.0 to 9
．． The present invention provides a spray adhesive composition comprising an aqueous liquid in the range of 0.

It is necessary to use a specific hydroxyalkyl starch as component (a), ie, the glue base of the present invention.

If a modified starch other than this hydroxyalkyl starch is used, the object of the present invention, which is to provide stability and good tension, cannot be achieved with a single component.
Furthermore, this hydroxyalkyl starch has 10
% aqueous solution, it must exhibit a viscosity of 10 to 100 centiboads at 25°C.
Preferred are hydroxymethyl starch, hydroxyethyl starch, and hydroxypropyl starch having such a viscosity, with a degree of substitution ranging from 0.1 to 0.6, with hydroxypropyl starch being particularly preferred. If you use a hydroxyalkyl starch with a viscosity of less than 10 centiboaz in a 10% aqueous solution, it cannot be sprayed directly onto the fabric and give good tension and strength after ironing; If more than 20% of the amount is used, it is not preferable because a good spray pattern cannot be obtained when air spraying, and it also causes clogging of the nozzle and poor penetration into the fabric.

Component (b) of the composition of the present invention is an alkali metal salt or alkanolamine salt of a copolymer of acrylic acid and methacrylic acid, and a 25% aqueous solution thereof exhibits 150 to 7000 centiboads at 25°C. It will be done.

This copolymer preferably has a molar ratio of acrylic acid monomer to methacrylic acid monomer of 9515 to 20180, and may be either a random copolymer or a block copolymer. Examples of the alkali metal salt of this copolymer include sodium salt and potassium salt. Examples of alkanolamine salts include ethanolamine salts, diethanolamine salts, triethanolamine salts, propanolamine salts, and difuropanolamine salts. In these copolymer salts, it is not necessary that all of the acid groups present in the copolymer be in the form of a salt, and some of the acid groups may be in the form of a salt. If a salt of a polymer other than the above-mentioned copolymers is used as component (b), the object of the present invention cannot be achieved. For example, when using copolymers such as sodium polyacrylate or sodium polymethacrylate, spraying and ironing them does not give good tension to the fabric, and starch builds up during storage. A decrease in pH due to hydrolysis and a change in viscosity over time cannot be avoided. In addition, when a copolymer of sodium acrylate and acrylic ester or methacrylic ester or a copolymer of sodium acrylate and styrene is used, the pH decreases due to starch hydrolysis and the viscosity changes over time. Not only that, but it also causes nozzle clogging, which is undesirable.

The composition of the present invention contains component (a) from 2 to 20% by weight based on its weight.
It is necessary to contain it in a proportion of 10%.

If this amount is less than 2%, it will not be able to give sufficient tension to the treated fabric, and if it exceeds 10%, the viscosity of the composition will increase, making it difficult to spray as an aerosol. Causes nozzle blockage. Next, in the composition of the present invention, component (a) and component (b) are
It is necessary to use a weight ratio of 713 to 70,130.

(b) If the amount of the component is less than this, it will not be possible to suppress the decrease in pH or the change in viscosity over time, and if the amount is more than this, it will not be possible to give good tension to the treated fabric. . Furthermore, the composition of the present invention has a pH of 6.
It is necessary to adjust it within the range of 0 to 9.0. In particular, when caustic soda is added to gelatinize hydroxypropyl starch, the pH becomes around H, which can cause discoloration and hydrolysis, so add an appropriate inorganic or organic acid to lower the pH. Adjust to the above range. Also, if you wish,
A portion of the carboxyl groups in the copolymer can also be neutralized with an alkali. The spray glue composition of the present invention includes:
If desired, additives customary for conventional spray pastes can be included.

Such additives include various nonionic surfactants,
Iron lubricants such as polyethylene glycol and various silicones, preservatives such as benzoic acid and sodium dehydroacetate, solvents such as ethyl alcohol, as well as fragrances and fluorescent dyes. Further, in the case of an aerosol, a propellant such as LPGl fluorocarbon gas can be contained. The spray adhesive composition of the present invention can be applied to various textile fabrics by various spray means, such as an aerosol type.

This product does not change in pH or viscosity during storage,
It is suitable as a spray glue for clothing made of cloth, polyester, nylon, etc., because it does not form precipitates and block the nozzle, and also gives good tension after treatment.

Next, the present invention will be explained in more detail with reference to Examples. The tension test in each example was conducted as follows.

Using the cantilever method according to JISlO76-1966, a predetermined amount of aerosol glue was sprayed onto a 60# cotton/polyester (35165) Proud cloth (30 x 20 cm), and after ironing, a test piece (2 x 15 cm) was set up. Take 5 specimens from each side, place them on a smooth horizontal table with one end sloped at 45 degrees, with the short side aligned with the scale baseline, and then gently slide the specimens in the direction of the slope using an appropriate method. When the center point of one end of the specimen touches the slope, read the position of the other end using the scale. At this time, the bending resistance, that is, the tensile strength, is indicated by the length of the scale. This value is shown to the nearest integer of the average value of each test piece. Example 1 Hydroxypropyl starch with a degree of substitution of 0.1 and a viscosity of a 10% aqueous solution at 25°C of 50 centiboas and various copolymers with a viscosity of 1000 centiboas of a 25% aqueous solution at 25°C were used, and a pH of about 8 with the following composition was used. An aqueous glue composition was prepared.

i Next, put 20 parts by weight of this composition into an aerosol can,
A spray paste was prepared by press-fitting 80 parts by weight of LPG.

This aerosol can was heated at room temperature, 35°C and 45°C.
After storing the seeds at the same temperature, the pH and viscosity of the contents were measured. Next, this was sprayed onto a predetermined fiber cloth in an amount of 8 V/600 cIL, and after ironing, the tension of the cloth was measured.

The results are shown in Table 1.

As is clear from this table, in the composition of the present invention, no change in pH and viscosity over time is observed, whereas in the comparative example, the pH and viscosity significantly decrease.

In addition, the composition of the present invention has better bending resistance when fabric is treated than that of the comparative example, and no change over time is observed. Example 2 Hydroxypropyl starch with degree of substitution 0.2, 10% aqueous solution viscosity 30 centiboars at 25°C and 250C
The viscosity of the 25% aqueous solution is 400 centibore,
*Acrylic acid-methacrylic acid copolymer sodium salt (monomer component ratio 111) was used to prepare aqueous compositions using the same ingredients as in Example 1, except that the ratio of the latter was varied.

The pH of this product was approximately 8. An aerosol type spray paste was prepared from this composition in the same manner as in Example 1, and the change in properties over time and the tension of the treated fabric were measured. The results are shown in Table 2.

Claims (1)

[Claims] 1 (a) A 10% aqueous solution has a temperature of 10 to 100 at 25°C.
2-10% by weight of hydroxyalkyl starch having a viscosity in the centipoise range and (b) a 25% aqueous solution at 25°C.
An alkali metal salt or an alkanolamine salt of a copolymer of acrylic acid and methacrylic acid having a viscosity in the range of 150 to 7000 centipoise is mixed with component (a) and (b).
A spray adhesive composition comprising an aqueous liquid having a weight ratio of 97/3 to 70/30 and a pH of 6.0 to 9.0. 2. The composition according to claim 1, wherein the hydroxyalkyl starch is hydroxypropyl starch. 3. The composition according to claim 1, wherein component (b) is an alkali metal salt or alkanolamine salt of a copolymer in which the molar ratio of acrylic acid to methacrylic acid is in the range of 95/5 to 20/80. .