JP2005201472A - Electrically flocked structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electrically flocked structure preventing a burn of a human body, giving a good feel in contact and having the excellent abrasion durability of a flocked article in the structure with a fiber electrically flocked on a metal base material around a heat source of a heating apparatus and at a warm air blowoff port. <P>SOLUTION: This electrically flocked structure is characterized in that the fiber is a polytrimethylene terephthalate fiber in the structure with the fiber electrically flocked on the metal base material around the heat source of the heating apparatus or at the warm air blowoff port. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a structure that is electrically flocked around a heat source of a heating device or a metal substrate of a hot air outlet.

When a human body such as a hand or a foot touches the surroundings of a heat source of a heating device or a metal substrate such as a hot air outlet, the surroundings of the heat source may be used to prevent such a burn. In addition, a structure in which fibers are electrically flocked as a burn prevention material is often used at the hot air outlet. Typical examples of the fibers to be electroplanted are viscose rayon and nylon.
However, conventional electric flocking structures using viscose rayon or nylon have various problems.

  For example, when used in a hot air outlet of a heater installed under the seat of a public transport such as a train or bus, a conventional electric flocking structure is a heel or trace that is struck by the corner of a shoe or a hard object. In other words, the so-called crash resistance is poor, and the durability and wear resistance of the appearance are insufficient. In particular, in rainy weather, pile sag and deformation occur under wet conditions due to rainwater intrusion and contact with umbrellas, wet shoes, etc., which not only significantly reduces the durability of the appearance, but also prevents burns. There was a problem that the function as a material also deteriorated.

  This problem is unavoidable due to the inherent properties of the material, in which viscose rayon and nylon have high water absorption and the fiber properties change greatly between water absorption and drying. In addition, viscose rayon and nylon also have a problem of light resistance in that discoloration and fading are likely to occur due to ultraviolet rays.

  Polyethylene terephthalate fiber can be considered as a material with little change in physical properties even under wet conditions. Although the electric flocking product using this fiber has no problems with deformation and light resistance of the pile due to moisture, the fiber is very hard, so that the cut edge is fused or burred during pile manufacturing. , Pile dispersibility is poor, electro-flocking and appearance are poor. Furthermore, in terms of physical properties, the crash resistance property was poor, the pile pile was large, it could not withstand long-term use, and dust removal was poor due to burrs at the cut end.

Further, Patent Document 1 discloses that a flocked product obtained by electrically flocking polytrimethylene terephthalate fiber to a fiber fabric or a resin molded product is excellent in elasticity recovery property when dried. However, there is no disclosure of a structure in which electric flocking is performed around a metal substrate such as a heat source of a heating device or a hot air outlet, and such a structure is excellent in abrasion resistance under high humidity. There is no disclosure about.
International Patent Publication WO99 / 32695 Pamphlet

  The present invention is a structure in which fibers are electrically flocked around a heat source of a heating device or a metal substrate of a hot air outlet, and has excellent touch feeling when contacted and excellent fretting durability of a flocked product. An object is to provide an electric flocking structure.

As a result of intensive research in order to solve the above problems, the present inventor has carried out electrical flocking of a specific fiber material around a heat source of a heating device or a metal substrate of a hot air outlet, thereby The present inventors have found that the object can be achieved and have completed the present invention.
That is, the present invention is a structure in which fibers are electroplanted around a heat source of a heating device or a metal substrate of a hot air outlet, and the fibers are polytrimethylene terephthalate fibers. It is a flocked structure.

Hereinafter, the present invention will be described in detail.
The electric flocking structure of the present invention has a pile in which polytrimethylene terephthalate fibers are electrically flocked around the heat source of a heating device or on the surface of a metal substrate at a hot air outlet.

  The polytrimethylene terephthalate fiber forming the pile portion means a polyester fiber having a trimethylene terephthalate unit as a main repeating unit, and the trimethylene terephthalate unit is 50 mol% or more, preferably 70 mol% or more, more preferably 80 mol. % Or more, most preferably 90 mol% or more. Accordingly, as the third component, the total amount of other acid components and / or glycol components is 50 mol% or less, preferably 30 mol% or less, more preferably 20 mol% or less, and most preferably 10 mol% or less. Includes fibers composed of contained polytrimethylene terephthalate.

  As a characteristic of the polytrimethylene terephthalate fiber used in the present invention, the strength is preferably 2 to 5 cN / dtex, more preferably 2.5 to 4.5 cN / dtex, and most preferably 3 to 4.5 cN / dtex. . The elongation is preferably 30 to 60%, more preferably 35 to 55%, and most preferably 40 to 55%. The elastic modulus is preferably 30 cN / dtex or less, more preferably 10 to 30 cN / dtex, still more preferably 12 to 28 cN / dtex, and most preferably 15 to 25 cN / dtex. The elastic recovery rate at 10% elongation is preferably 70% or more, more preferably 80% or more, still more preferably 90% or more, and most preferably 95% or more.

  Polytrimethylene terephthalate is synthesized by combining terephthalic acid or a functional derivative thereof with trimethylene glycol or a functional derivative thereof in the presence of a catalyst under appropriate reaction conditions. In this synthesis process, a suitable one or two or more third components may be added to form a copolyester. Polyesters other than polytrimethylene terephthalate, such as polyethylene terephthalate and polybutylene terephthalate, and nylon, and polytrimethylene terephthalate are synthesized separately and then blended, or composite spinning (sheath core type, side-by-side type, etc.) May be. In this case, a polymer other than polytrimethylene terephthalate can be used at a ratio of 30% by mass or less with respect to the whole.

  With respect to composite spinning, the first component is a polytrimer as exemplified in Japanese Patent Publication No. 43-19108, Japanese Patent Application Laid-Open No. 11-189923, Japanese Patent Application Laid-Open No. 2000-239927, Japanese Patent Application Laid-Open No. 2000-256918, and the like. Methylene terephthalate, the second component of which is compound-spun into a side-by-side type or an eccentric seascore type in which polyesters such as polytrimethylene terephthalate, polyethylene terephthalate, polybutylene terephthalate, nylon, etc. are arranged in parallel or eccentrically. It may be.

  The third component to be added includes aliphatic dicarboxylic acids (oxalic acid, adipic acid, etc.), alicyclic dicarboxylic acids (cyclohexanedicarboxylic acid, etc.), aromatic dicarboxylic acids (isophthalic acid, sodium sulfoisophthalic acid, etc.), fat Aliphatic glycols (ethylene glycol, 1,2-propylene glycol, tetramethylene glycol, etc.), alicyclic glycols (cyclohexanedimethanol, etc.), aliphatic glycols containing aromatics (1,4-bis (β-hydroxyethoxy) benzene Etc.), polyether glycol (polyethylene glycol, polypropylene glycol etc.), aliphatic oxycarboxylic acid (ω-oxycaproic acid etc.), aromatic oxycarboxylic acid (p-oxybenzoic acid etc.) and the like. In addition, a compound having one or three or more ester-forming functional groups (such as benzoic acid or glycerin) can be used within a range where the polymer is substantially linear.

  In addition, the fiber includes a matting agent such as titanium dioxide, a stabilizer such as phosphoric acid, an ultraviolet absorber such as a hydroxybenzophenone derivative, a crystallization nucleating agent such as talc, a lubricant such as aerosil, and an anti-hindered phenol derivative. An oxidizing agent, a flame retardant, an antistatic agent, a pigment, a fluorescent brightening agent, an infrared absorber, an antifoaming agent, and the like may be contained.

  In the present invention, the production method of polytrimethylene terephthalate fiber includes a usual melt spinning method, for example, a method described in International Patent Publication WO99 / 27168. That is, after obtaining an undrawn yarn at a winding speed of about 1500 m / min, a method of twisting at about 2 to 3.5 times, a spin draw method in which a spinning-drawing process is directly connected, a winding speed of 5000 m / min or more Any of high-speed spinning method (spin take-up method) may be employed.

The form of the fiber may be long fiber or short fiber, and may be uniform or thick in the length direction, and the cross-sectional shape is round, triangular, L-shaped, T-shaped, Y-shaped, W-shaped, It may be a polygonal type such as an eight-leaf type, a flat shape, or a dogbone type, a multi-leaf type, a hollow type, or an irregular shape.
As the form of the yarn, the original yarn, false twisted yarn (including POY drawn false twisted yarn), and pre-twisted false twisted yarn (for example, pre-twisted about 200 to 1000 T / m in the S or Z direction and temporarily twisted in the Z or S direction) Twisted), indented crimped yarn and the like.

  The electric flocking structure of the present invention is characterized in that a pile portion formed by electric flocking is configured using polytrimethylene terephthalate fibers. The proportion of the polytrimethylene terephthalate fiber in the pile part is mass%, preferably 30% or more, more preferably 50% or more, still more preferably 70% or more, and most preferably 80% or more. When the mixing ratio of the polytrimethylene terephthalate fiber is 30% or more, the object of the present invention is sufficiently achieved.

  Examples of other fibers that can be mixed with the polytrimethylene terephthalate fiber in the pile portion include polyethylene terephthalate fiber, polybutylene terephthalate fiber, polyamide fiber (nylon 6 fiber, nylon 66 fiber, etc.), polyethylene fiber, Synthetic fibers such as polyacrylic fibers, polyvinyl fibers, polypropylene fibers, natural fibers such as cotton, hemp, wool, silk, cellulose fibers such as cupra ammonium rayon, viscose rayon, polynosic, acetate fibers, etc. There is no particular limitation.

  The single yarn fineness of the polytrimethylene terephthalate fiber used for the pile part is preferably 0.2 dtex to 100 dtex, more preferably 0.5 dtex to 60 dtex, and still more preferably 1 dtex to 30 dtex.

The fiber for electric flocking is used by, for example, stretching an unstretched tow or bundling stretched yarns into a tow of several hundred thousand to several million dtex by a conventional method, and then cutting. The length of a pile can select arbitrary length, Usually, 0.2-3 mm, Preferably it is 0.5-2 mm. The density (weight per unit area) for planting is usually 50 to 500 g / m ² , preferably 80 to 300 g / m ² . When the basis weight is 50 to 500 g / m ² , the aesthetics required for the structure and the protective effect on the human body are sufficient, the texture is soft, and the pile is connected to the electrode plate during electric flocking. Since there is no occurrence of a so-called short-circuit phenomenon that comes into contact, electric flocking can be carried out smoothly.

  The fibers forming the pile part may be colored. The coloring method is not limited, and any method may be used by dyeing before electric flocking by raw material coloring, wrinkle dyeing, tow dyeing, pile package dyeing, etc., or by post-dying after electric flocking, printing, etc. The method etc. of giving the pattern of are adopted. When coloring the raw material, it is possible to produce a pile having good performance by selecting a general fast pigment. When dyeing yarn or cut pile, a disperse dye having good fastness is used, and the dyeing temperature is usually 90 to 135 ° C, preferably 100 to 130 ° C.

  In addition, combined with a UV absorber to obtain high light resistance, and combined with a dyeing prescription combined with an exhaust type SR processing agent to improve the adhesion between the pile and the emulsion resin layer used in electric flocking. Is preferred.

  In the present invention, the fibers used for the electric flocking are preferably subjected to an electrodeposition treatment in order to improve the separation property and flying property of the assembled short fibers. Electrodeposition treatment is, for example, an open kettle equipped with a stirrer and a treatment mainly composed of inorganic salts such as sodium chloride, potassium chloride, barium chloride, magnesium sulfate, sodium sulfate, ammonium chloride, ammonium sulfate, colloidal silica, antistatic agent, etc. It is preferable to perform electrodeposition treatment using a liquid.

  During electric flocking, the dispersibility of the pile is susceptible to physical influences such as the stirring force of the stirrer, the stirring time, the bath ratio of the pile and the processing liquid, and the processing temperature, and the activity of penetrants, dispersants, etc. Since the combined use of an agent and the like is also effective in pile dispersibility, such a pile dispersion treatment step may be incorporated before pile package dyeing or before electrodeposition treatment. By carrying out such a dispersion treatment, a great effect can be expected in improving the pile sorting efficiency and sorting yield after electrodeposition treatment and in improving the flocking property.

The adhesive for bonding the pile fibers to the metal substrate can be arbitrarily selected from, for example, polyvinyl acetate, synthetic rubber latex, natural rubber latex, acrylic ester emulsion, polyurethane resin, polyester resin, and the like. Further, these resins can be blended and used. The application amount of the adhesive varies depending on the concentration, viscosity, and the like of the adhesive, but may be arbitrarily selected within a range that can satisfy the required performance as an electric flocking structure. For example, preferably 150 to 500 g / m ^2. More preferably, it is the range of 200-400 g / m < ² >.

  In addition, in order to improve the adhesion to the metal substrate, before applying the adhesive, the surface of the metal substrate is cleaned by surface immersion by immersion using ultrasonic waves, polishing by sandpaper or buffing, etc. By performing the surface treatment in advance, stronger adhesiveness can be obtained.

  As the metal substrate, metals such as iron, aluminum, stainless steel, mild steel, copper, chromium, nickel, titanium, etc. and their alloys, fiber reinforced metals, etc. can be used. There are no restrictions on the material. Appropriate metal depending on the field to be used, such as around the heat source for commercial and household heating devices such as heaters for vehicles such as trains and buses, kotatsu, stoves, fan heaters, panel heaters, etc. A substrate may be used.

Electric flocking generates a high-voltage electrostatic field between opposing electrodes, arranges a metal base with an adhesive applied to one electrode, and charges the electrodeposited pile to provide the opposite electrode The pile is levitated toward the base material and is used for electric flocking.
As a method of flying the pile, there are (i) a down method (a method of flocking the pile from below and electric flocking), (b) an up method (a method of flocking the pile from below and carrying out electric flocking), etc. Many down methods are used, but are not limited.

  The distance between the electrodes is changed depending on the length of the pile. When the pile is short, the space between the electrodes is small, and when the pile is long, the space between the electrodes is large. For example, when the length of the pile is 0.5 mm, the distance between the electrodes is preferably 50 mm or more, and when the pile is 3 mm, the distance between the electrodes is preferably 200 mm or more. If the distance between the electrodes is sufficiently large with respect to the length of the pile, the distance that the piles fly is increased, so that it can be cast deeper into the adhesive layer, so that the adhesive strength of the pile can be improved. The high voltage applied to the electrodes can be arbitrarily set in the range of 10 to 100 kV depending on the electrode interval, pile length, flocking density, electrodeposition treatment conditions, and the like.

  After the electric flocking, heat treatment is performed to dry the adhesive and perform a crosslinking reaction in order to fix the pile. The heat treatment is performed at a temperature and time suitable for the type of adhesive and the type of crosslinking agent. After the heat treatment, it is preferable to perform a dust removal treatment by air suction, brushing or the like in order to remove the excess pile that is not bonded.

  The electric flocking structure of the present invention has a good feeling when touched, has no pile sag and deformation even when wet, and has excellent external scratch durability.

EXAMPLES Hereinafter, although an Example is given and this invention is demonstrated further, this invention is not limited to these.
Measurement methods, evaluation methods, etc. are as follows.

(1) Intrinsic viscosity Intrinsic viscosity [η] (dl / g) is a value determined based on the definition of the following equation.

  In the formula, ηr is a value obtained by dividing the viscosity at 35 ° C. of a diluted polymer solution dissolved in an o-chlorophenol solvent having a purity of 98% or more by the viscosity of the solvent measured at the same temperature, and is defined as a relative viscosity. It is what has been. C is the polymer concentration expressed in g / 100 ml.

(2) Elastic recovery rate at 10% elongation The fiber is attached to a tensile tester with a distance between chucks of 10 cm, stretched to a stretching rate of 10% at a pulling speed of 20 cm / min, and left for 1 minute. Then, it shrinks again at the same speed, and draws a stress-strain curve. The elongation when the stress becomes zero during shrinkage is defined as the residual elongation (A).
The elastic recovery rate at 10% elongation was determined according to the following formula.
Elastic recovery rate at 10% elongation (%) = [(10−A) / 10] × 100

(3) Taber Abrasion Test Performed according to JIS-L-1096. Grades with good wear resistance are graded 5, grades with inferior grades are graded 1, and the middle is sequentially judged as grades 4, 3, and 2. .

(4) Coin scratching (crash resistance)
The sample is immersed in water at 20 ° C. for 10 minutes and then taken up to prepare a wet sample. A device in which a ten-yen coin is set up vertically with respect to the flocked surface of the sample and adjusted with a clamp or the like so that a load of 2 kg is applied to the coin is made. Next, the sample is moved 100 mm horizontally at a speed of 10 mm / sec in the thickness direction of the coins, and the marks and hair fallability after rubbing are evaluated based on the following criteria.
○: Almost no surface change.
Δ: Slightly scratched.
X: There is a fretting, and there is a fall of the pile or omission.

[Reference Example] (Production of polytrimethylene terephthalate fiber)
Polytrimethylene terephthalate having an intrinsic viscosity [η] of 0.92 was spun at a spinning temperature of 265 ° C. and a spinning speed of 1200 m / min to obtain an undrawn yarn. Subsequently, the yarn was drawn at a hot roll temperature of 60 ° C., a hot plate temperature of 140 ° C., a draw ratio of 3 times, and a draw speed of 800 m / min to obtain a drawn yarn of 84 dtex / 36f (2.2 dtex / f).
The obtained drawn yarn had strength, elongation, elastic modulus, and elastic recovery at 10% elongation of 3.3 cN / dtex, 46%, 20 cN / dtex, and 95%, respectively.

[Example 1]
The polytrimethylene terephthalate fiber obtained in the above reference example is bundled in a tow shape with a scooping machine, and cut with a fiber guillotine type automatic cutting machine (manufactured by Onouchi Seisakusho Co., Ltd .: D type). 2 kg of pile was produced.
Next, the pile was packed in a bag and loaded into a package dyeing machine (MODEL HUHT-250 / 450) manufactured by Nisaka Manufacturing Co., Ltd., followed by 2 g / liter of score roll FC-250 (trademark, manufactured by Kao Corporation), Scouring was carried out at 2 g / liter of sodium carbonate, a bath ratio of 1:15, a scouring temperature of 70 ° C., and a scouring time of 20 minutes.

  Next, Dianix Black BG-SF 200% (trademark, manufactured by Dystar Co., Ltd.) 6% omf as a disperse dye, Nikka Sun Salt 7000 (trademark, manufactured by Nikka Chemical Co., Ltd.) 1 g / liter, pH as a leveling agent The pH was adjusted to 5 with acetic acid / sodium acetate as an adjusting agent, the temperature was raised to 120 ° C. at a temperature rising rate of 2 ° C./min at a bath ratio of 1:15, and dyeing was performed at 120 ° C. for 45 minutes. After dyeing, it was cooled to 40 ° C., drained, and then washed twice with batch water.

Next, sodium hydroxide 2 g / liter, hydrosulfite 2 g / liter, Sunmol RC-700 (trademark, manufactured by Nikka Chemical Co., Ltd.) 2 g / liter, bath ratio 1:15, heating rate 2 ° C./minute The mixture was heated up to 80 ° C., reduced and washed at 80 ° C. for 20 minutes, pickled with 0.5 g / liter of acetic acid, then washed twice with batch water and subjected to centrifugal dehydration for 5 minutes.
After centrifugal dehydration, the pile is taken out of the bag, and 5 wt parts of sodium chloride, 2 wt parts of colloidal silica Snowtex O (trademark, manufactured by Nissan Chemical Co., Ltd., 20 wt% dispersion), Nispol FE-18 ( (Trademark, manufactured by Nikka Chemical Co., Ltd.) 2 wt parts were diluted with water and acetic acid, adjusted to pH 5 to 100 wt parts, electrodeposition treatment bath conditions with a treatment temperature of 40 ° C. and a bath ratio of 1:40 The pile was stirred and immersed under 60 minutes.

  Next, centrifugal dehydration was performed so that the average moisture content of the pile was 20 to 30 wt%, and the shelf drying was performed at 60 ° C. for 6 hours using a constant temperature dryer, and then a sieve shaker (manufactured by Tanaka Chemical Machinery Co., Ltd.). : Pile selection after electrodeposition treatment was performed using a 50-mesh sieve under shaking conditions: 290 cpm, 20 minutes, number of strokes of 156 strokes / min. The selection yield at that time was 95%.

Using the obtained pile, an electric flocking structure was produced according to the following.
An iron metal plate (thickness 0.5 mm, 500 mm square) was used as the metal substrate, and surface treatment was performed with # 120 sandpaper as a pretreatment of the substrate.
As an adhesive, acrylic emulsion resin Cybinol ER-8 (trademark, manufactured by Seiden Chemical Co., Ltd.) 100 wt part, thickener AZ-1 (trademark, manufactured by Seiden Chemical Co., Ltd.) 0.5 wt part, about 5% aqueous ammonia Using 1.5 wt part, BL type viscometer No. An adhesive whose viscosity was adjusted to 12 Pa · s (20 ° C.) with 4 rotors was produced.

After applying 300 g / m ² of this adhesive to a metal substrate with a bar coater, electric flocking was performed by a down method under the conditions of a voltage of 25 kV and a distance between electrodes of 10 cm.
Next, preliminary drying was performed at 100 ° C. for 5 minutes in a constant temperature dryer, and after curing drying at 160 ° C. for 2 minutes, the excess pile was removed to obtain an electric flocking structure.

[Example 2]
Two types of polytrimethylene terephthalate having different intrinsic viscosities were extruded into a side-by-side mold at a ratio of 1: 1 to obtain an undrawn yarn at a spinning temperature of 265 ° C. and a spinning speed of 1500 m / min. Subsequently, the hot roll temperature is 55 ° C., the hot plate temperature is 140 ° C., the stretching speed is 400 m / min, the stretching ratio is set so that the fineness after stretching is 84 dtex, and the film is stretched to 84 dtex / 36f (2.2 dtex / f). A side-by-side composite multifilament was obtained. The composite multifilament obtained had intrinsic viscosity [η] = 0.90 on the high viscosity side and [η] = 0.70 on the low viscosity side.
Using these two-component side-by-side type yarns, electric flocking was performed in the same manner as in Example 1 to obtain an electric flocking structure.

[Comparative Example 1]
Using a tow of viscose rayon fiber (2.2 dtex / f), changing the dyeing conditions, as a direct dye, Kayarus Black B 160 (trademark, Nippon Kayaku Co., Ltd.) 3% omf, sodium sulfate 20 g / liter, An electric flocking structure was obtained in the same manner as in Example 1 except that dyeing was performed at a temperature of 95 ° C. for 30 minutes.

[Comparative Example 2]
Using tow of polyamide fiber (2.2 dtex / f), changing dyeing conditions, Aizen Opal Black (trademark, manufactured by Hodogaya Chemical Co., Ltd.) 3% omf, acetic acid 1% omf, temperature An electric flocking structure was obtained in the same manner as in Example 1 except that dyeing was performed at 95 ° C. for 40 minutes.

  Table 1 shows the results of the Taber abrasion test and coin abrasion of the electric flocking structures obtained in the above Examples and Comparative Examples.

  The electric flocking structure of the present invention is suitable for the vicinity of heat sources such as heaters for vehicles such as trains and buses, kotatsu, stoves, fan heaters, panel heaters, etc. It is possible to prevent burns of the human body such as hands and feet due to contact with a heat source or warm air.

Claims (1)

An electric flocking structure in which fibers are electrically flocked around a heat source of a heating device or a metal base material of a hot air outlet, and the fibers are polytrimethylene terephthalate fibers.