JP2013154325A - Filter for air conditioner suction port - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a filter for a suction port, in which the filter is prevented from dropping out and the paste remainder at the filter peeling after use can be reduced or eliminated.SOLUTION: A filter for an air conditioner suction port is a filter that is used to be put on a cover that covers the suction port of an air conditioner, and is characterized in that (1) the filter includes an adhesive layer formed on a nonwoven fabric and on all surface or a part of one surface of the nonwoven fabric, (2) the adhesive layer is formed of a polyurethane-based adhesive of a two-liquid mixing type, including a main agent and a curing agent, (3) the main agent includes polyurethane polyol having the molecular weight of 15,000-25,000, and (4) the curing agent is included by 6-8 pts.wt. based 100 pts.wt. of the main agent.

Description

The present invention relates to a filter attached to an air inlet of an air conditioner.
About.

  In an air conditioner, air is cooled or heated by sucking indoor air into the apparatus through the air inlet and bringing the air into contact with a heat exchanger in the apparatus. A filter for removing dust and the like in the air is installed in this device, but in order to reduce the troublesomeness of cleaning the filter, the plastic cover that covers the air inlet of the air conditioner has the above-mentioned A method of providing a filter for an intake port separately from the filter has been proposed. Most of such air inlet filters are formed by forming a weak adhesive layer on one surface of a non-woven fabric and attaching to the air inlet through the adhesive layer. For example, a filter for adhering an object and filtering a gas passing therethrough, which is applied to only a part of the sheet-like nonwoven fabric and one side of the nonwoven fabric at the outer peripheral edge of the nonwoven fabric. A filter including an adhesive is known (Patent Document 1).

  In such an air conditioner filter, a non-woven fabric coated with an acrylic adhesive is generally used. In recent years, polyurethane adhesives have been used in adhesive filters such as ventilation fan filters. The polyurethane-based pressure-sensitive adhesive can exhibit performance superior to that of the acrylic pressure-sensitive adhesive in terms of adhesive residue or sticking durability.

JP 2002-85927 A

  However, the plastic cover that covers the air intake of the air conditioner is specially painted or textured to improve design, so the surface part must be made of a material different from the cover. For this reason, ordinary polyurethane adhesives cannot be used. That is, since the desired adhesiveness cannot be obtained even if a filter is attached with a polyurethane-based adhesive as described above to a plastic cover having a surface portion made of such a different material, May fall off. In this case, it is possible to increase the adhesive strength so that the inlet filter does not fall off, but if the adhesive strength is increased, the paint on the surface of the cover may come off when removing the used filter, or the inlet filter Phenomenon (adhesive residue) remains.

  Accordingly, a main object of the present invention is to provide an inlet filter that prevents the filter from falling off and reduces or eliminates adhesive residue when the filter is peeled off after use.

  The present inventor conducted research and experiments on various commercially available two-component mixed polyurethane adhesives, and the adhesive residue was improved even when the curing agent was mixed with the main agent at the rate specified by the manufacturer and applied to the nonwoven fabric. It turned out not to. The reason for this is that for materials with uneven surfaces such as nonwoven fabric, a coating film having a uniform and smooth surface is formed on the nonwoven fabric surface in the process of forming the adhesive layer with a printing machine, coater, etc. As a result of not being able to be formed, it was found that it was easy to drop off from the nonwoven fabric from the cover, which is the adherend.

  Accordingly, the present inventor can achieve the above object by applying a two-component mixed polyurethane pressure-sensitive adhesive in which a curing agent is blended as a main component in a specific ratio with respect to a polyurethane polyol having a specific molecular weight, to the nonwoven fabric. As a result, the present invention has been completed.

That is, the present invention relates to the following air conditioner inlet filter.
1. A filter that is used by attaching it to the cover that covers the air intake of the air conditioner,
(1) The filter includes a non-woven fabric and an adhesive layer formed on the entire surface or a part of one surface of the non-woven fabric,
(2) The pressure-sensitive adhesive layer is formed of a two-component mixed polyurethane pressure-sensitive adhesive containing a main agent and a curing agent,
(3) The main agent includes a polyurethane polyol having a molecular weight of 15,000 to 25000,
(4) The curing agent is contained in 6 to 8 parts by weight with respect to 100 parts by weight of the main agent.
This is a filter for air conditioner intakes.
2. Item 2. The air conditioner air inlet filter according to Item 1, wherein the adhesive further comprises 0.25 to 0.5 parts by weight of an ultraviolet absorber with respect to 100 parts by weight of the main agent.
3. Item 3. The air conditioner inlet filter according to Item 1 or 2, wherein the nonwoven fabric has a thickness of 1.0 to 2.0 mm and a basis weight of 20 to 50 g / m ² .
4). Item 4. The air conditioner air inlet filter according to any one of Items 1 to 3, wherein the curing agent is an aliphatic polyfunctional isocyanate.
5. Item 5. The air conditioner air inlet filter according to any one of Items 1 to 4, wherein a surface of the cover is resin-coated or textured.
6). Item 6. The intake port filter according to any one of Items 1 to 5, wherein the area ratio of the pressure-sensitive adhesive layer to the nonwoven fabric is 10 to 30%.
7). Item 7. The air conditioner air inlet filter according to any one of Items 1 to 6, wherein a release sheet is further laminated on the pressure-sensitive adhesive layer.

  According to the air conditioner air inlet filter of the present invention, the two-component mixed polyurethane adhesive containing a specific amount of curing agent together with a polyurethane polyol having a predetermined molecular weight is applied to the nonwoven fabric. When the filter is attached to the air intake port, a predetermined adhesive force can be obtained, and the filter can be more effectively suppressed or prevented from falling off from the air conditioner. On the other hand, when the filter is removed, the problem of adhesive residue can be solved.

It is the schematic which shows the state which applied this invention filter to the air conditioner. It is a top view which shows the unfolded state before attachment of the filter shown in FIG. FIG. 3 is a diagram illustrating a part of the filter illustrated in FIG. 2. It is sectional drawing of the IV-IV line of FIG.

The air conditioner inlet filter of the present invention is a filter that is used by being attached to a cover that covers the air intake of the air conditioner,
(1) The filter includes a non-woven fabric and an adhesive layer formed on the entire surface or a part of one surface of the non-woven fabric,
(2) The pressure-sensitive adhesive layer is formed of a two-component mixed polyurethane pressure-sensitive adhesive containing a main agent and a curing agent,
(3) The main agent includes a polyurethane polyol having a molecular weight of 15,000 to 25000,
(4) The curing agent is contained in 6 to 8 parts by weight with respect to 100 parts by weight of the main agent.

  The filter for an air conditioner intake port of the present invention (the filter of the present invention) can be applied to a cover that covers the air intake port of the air conditioner. FIG. 1 shows an example in which the filter of the present invention is applied to an air conditioner (home air conditioner). In this home air conditioner 20, 1) an air intake port 22 for sucking indoor air is provided on the cover front surface 21 of the air conditioner 20 and 2) an air discharge for blowing the air sucked into the room after being cooled or heated. It has an outlet 23. As shown in FIG. 1, the air conditioner 20 may be provided with a temperature sensor 24 for detecting the temperature in the room and controlling the blow-out temperature as required. The air inlet 22 is generally composed of a plurality of bars extending parallel to the width direction of the air conditioner 20.

  In FIG. 1, the filter 15 of the present invention is attached to the cover front surface 21 and the cover upper surface 25 of the air conditioner 20. In this invention, this invention filter can be affixed on the whole surface of the cover which covers an inlet port, or its part. In particular, it is desirable to affix the filter of the present invention on the entire surface of the cover that covers the air inlet.

  As the nonwoven fabric itself used in the filter of the present invention, a known or commercially available one can be used. That is, any non-woven fabric made of natural fibers, synthetic fibers, and a mixture thereof can be used, but non-woven fabrics made of synthetic fibers such as polyester fibers, polyamide fibers, and polyimide fibers can be preferably used. Therefore, for example, a nonwoven fabric made of polyethylene terephthalate (PET) fibers can also be used suitably. The manufacturing method of a nonwoven fabric is not limited, either, For example, the nonwoven fabric manufactured by well-known manufacturing methods, such as a thermal bond method, can be used suitably.

Moreover, although the thickness of the said nonwoven fabric is not limited, it is preferable that thickness is 1.0-2.0 mm, especially 1.2-1.5 mm. Further, the nonwoven fabric of basis weight is not particularly limited, for example, 20 to 50 g / ^{m 2,} it is particularly preferably 30 to 40 g / ^{m 2.}

  The filter of the present invention includes a non-woven fabric and an adhesive layer formed on the entire surface or a part of one surface of the non-woven fabric. For example, FIG. 2 shows a developed state before the filter of the present invention shown in FIG. 1 is attached. FIG. 3 shows a part of a plan view of the filter, and FIG. 4 shows a IV-IV sectional view thereof. In the inlet filter 15, the adhesive layer 32 is formed on a part of one surface of the nonwoven fabric 35. More specifically, the pressure-sensitive adhesive layer 32 is formed in a stripe shape with respect to the nonwoven fabric 35. In the present invention, the pressure-sensitive adhesive layer may be formed on the entire surface of one side of the nonwoven fabric, or may be partially formed as described above. Furthermore, when forming the pressure-sensitive adhesive layer on a part of one side of the nonwoven fabric, it may be formed in a stripe shape as shown in FIGS. 2 and 3, and in addition, a lattice shape, a dotted shape, a pattern pattern, etc. Any form may be sufficient. In particular, when forming the pressure-sensitive adhesive layer on a part of one side of the nonwoven fabric, increasing the pressure-sensitive adhesive application area makes it difficult for the filter to be peeled off from the adherend (cover), and the holding power of the filter is improved. Since the coated portion of is not breathable, breathability may be impaired. Therefore, in order to function more effectively as an air inlet filter, the area ratio of the application part of the pressure-sensitive adhesive occupying the area of the non-woven fabric attachment surface of the filter is usually about 10 to 30%, particularly 15 to 20%. It is desirable to do.

  Moreover, this invention filter may laminate | stack release sheets, such as release paper, on an adhesive layer. For example, in the filter of FIG. 2, a release paper 37 is laminated on the adhesive layer 32 before use as shown in FIG. In use, the release paper 37 is peeled off from the adhesive layer 32 and attached to the cover of the air conditioner. At this time, when the position of the end side of the adhesive layer 32 is formed at the position of the distance L2 inward, the release paper 37 is more in comparison with the case where the adhesive layer 32 is formed up to the end. Easy to peel off. The ease of peeling of the release paper 37 is the same at the positions of the upper side 16 and the lower side 17 of the filter 15 at the end in the formation direction of the adhesive layer 32.

  In the filter of the present invention, the pressure-sensitive adhesive layer is formed of a two-component mixed polyurethane pressure-sensitive adhesive containing a main agent and a curing agent. As a main ingredient in the said adhesive, the polyurethane polyol which is molecular weight 15000-25000 (preferably 18000-23000) is included as a main component. In this specification, all molecular weights indicate weight average molecular weights. The molecular weight was measured using “Prominence” manufactured by Shimadzu Corporation (column: TSKgelGMHx2 connected by TOSOH, detector: RID-10A, solvent: THF, flow rate; 1 ml / min).

  The polyurethane polyol is obtained by reacting a polyester polyol and a polyether polyol with an organic polyisocyanate compound in the presence or absence of a catalyst, and a known or commercially available one can be used.

  The ratio of the polyurethane polyol in the main agent is usually 95% by weight or more, and further 99% by weight or more. Therefore, the proportion of polyurethane polyol in the main agent may be 100% by weight.

  As the curing agent, for example, an aliphatic polyfunctional isocyanate can be suitably used. In this invention, a hardening | curing agent shall be 6-8 weight part with respect to 100 weight part of said main ingredients. As described above, in the present invention, by using the pressure-sensitive adhesive containing the polyurethane polyol having a specific molecular weight and containing the specific amount of the curing agent, the problem of the adhesive residue and the problem of dropping off the filter are solved at once. Is possible.

  As the main agent and the curing agent used in the two-component mixed polyurethane pressure sensitive adhesive as described above, known or commercially available ones can also be used. As a commercially available product, for example, a combination of a product name “Siavine SH-101” (manufactured by Toyo Ink Co., Ltd.) as a main agent and a product name “Siavine T-501” as a curing agent can be suitably used.

  In the present invention, other additives may be contained in the two-component mixed polyurethane pressure-sensitive adhesive as necessary within a range not impeding the effects of the present invention. Examples thereof include additives such as ultraviolet absorbers, fillers, colorants, antioxidants, antifoaming agents, and light stabilizers. In particular, in the present invention, it is desirable that an ultraviolet absorber is included. Although the addition amount of a ultraviolet absorber can be suitably set according to a desired characteristic, For example, 0.25-0.5 weight part can be added with respect to 100 weight part of main agents.

  Furthermore, the pressure-sensitive adhesive (main agent or curing agent) can be appropriately diluted with a solvent as necessary. For example, an organic solvent such as ethyl acetate can be used. The dilution rate in this case is not limited. For example, it can be diluted by blending 1 to 30 parts by weight of the solvent with respect to 100 parts by weight of the main agent.

  For forming the pressure-sensitive adhesive layer, a known method may be employed. For example, a method of drying (solidifying) the coating film after forming the coating film by applying the pressure-sensitive adhesive to the nonwoven fabric may be employed. The application method is not limited, and can be performed by, for example, a roller, spray, brush, printing, or the like. In this case, a known apparatus can be used, and for example, any of a roll coater method, a comma coater method, a die coater method, a reverse coater method, a silk screen method, a gravure coater method and the like can be adopted. Moreover, as a method for solidifying the coating film, any of a method using heating, a method using ultraviolet rays, and the like can be adopted, but a method using heating can be particularly preferably used. The heating temperature in this case is not particularly limited as long as a desired pressure-sensitive adhesive layer can be formed, but is usually in the range of 120 to 140 ° C, particularly 125 to 130 ° C.

  Although the thickness of an adhesive layer (after solidification) can be suitably set according to desired adhesiveness etc., it is usually preferable to set it as 100-300 micrometers, especially 180-230 micrometers.

  The filter of the present invention can be used in the same manner as a known air conditioner inlet filter. That is, the adhesive layer of the filter of the present invention may be attached by contacting the cover surface covering the air intake of the air conditioner. If necessary, the filter of the present invention may be cut to match the filter of the present invention with the size of the cover. The air conditioner to which the filter of the present invention is applied only needs to have a cover that covers the intake port, and may be for home use, business use, or the like. The material of the cover is not particularly limited, but synthetic resins such as ABS and PS (polystyrene) are suitable.

  The features of the present invention will be described more specifically with reference to the following examples and comparative examples. However, the scope of the present invention is not limited to the examples.

Examples 1-7 and Comparative Examples 1-9
(1) Preparation of two-component mixed polyurethane pressure-sensitive adhesive Table 1 shows the measurement results of the average molecular weight of the main ingredients of commercially available polyurethane polyols A to E used in this example. As shown in Table 2, these polyurethane polyols are mixed with a commercially available aliphatic polyfunctional isocyanate curing agent at a predetermined ratio, and further diluted by 5 to 20 parts by weight with ethyl acetate, thereby mixing a two-component polyurethane adhesive. Each agent was prepared. The product name “Siabine T-501” was used as the curing agent.

(2) Adhesive processing As a nonwoven fabric used for a filter, a commercially available nonwoven fabric (weighing 35 g / m ² , thickness 1.2 mm ± 10% (manufacturer nominal value)) was prepared. The polyurethane pressure-sensitive adhesive was applied with a printing machine so that the pressure-sensitive adhesive layer having a width of 5 mm was in a lattice shape with a spacing of 30 mm with respect to the nonwoven fabric. In the filter thus obtained, the area ratio of the pressure-sensitive adhesive layer to the nonwoven fabric was 17.7%. The pressure-sensitive adhesive was dried by passing it through a drying furnace having a total length of 10 m at a speed of 125 to 130 ° C. and a speed of 18 to 25 m / min. The thickness of the obtained pressure-sensitive adhesive layer (after drying) was in the range of 200 μm ± 20 μm.

Test example 1
Each filter obtained in the examples and comparative examples was attached to a base material (such as a commercially available air conditioner cover), and examined for the presence or absence of glue and the presence of adhesive residue. The results are shown in Table 2.

(1) Presence / absence of filter removal Each of the ABS plate (surface roughness: mirror surface), PS (polystyrene) plate (surface roughness: mirror surface) and Toshiba air conditioner wood shadow cover (surface clear coating product, surface roughness: mirror surface) A filter (4 cm × 11 cm) was affixed, stood vertically, and allowed to stand at room temperature (average 25 ° C.) and humidity 75% (excluding air conditioners) for 3 months, and the presence or absence of dropping was confirmed. The pasting (crimping) was carried out by a method of reciprocating once with a roller at a pressure of 2 kg / cm ² . The obtained samples were examined for the presence or absence of filter removal. The case where no dropout was observed was evaluated as “◯”, and although there was some peeling, the case where the dropout did not drop was evaluated as “Δ”, and the case where the dropout occurred was evaluated as “x”.

(2) Presence or absence of adhesive residue As the adherend, the same ABS plate, PS plate and Toshiba air conditioner as in the test example: each filter (4 cm × 11 cm) was attached to wood shadow (surface clear coating product), and room temperature (average 25) ° C) and 40 ° C for 3 months in a constant humidity oven with a humidity of 75%. After that, when the filter is peeled off from the adherend, the case where there is no adhesive residue visible on the adherend is evaluated as “◯”, and the case where it remains slightly to the extent that there is no influence is evaluated as “△”. Then, the state where the adhesive residue could be visually recognized and the filter could not be newly attached unless a measure such as wiping off the remaining adhesive was evaluated as “x”.

  As is clear from the results in Table 2, regarding the content of the curing agent, there is a problem of adhesive residue on the adherend in the range of 6.0 to 8.0 parts by weight with respect to 100 parts by weight of the main agent. It can be seen that there is no problem of filter dropout. In particular, the most excellent effect was observed when the content of the curing agent was 8.0 parts by weight. Next, regarding the molecular weight of the polyurethane polyol, it was confirmed that the molecular weight of the polyurethane polyol was particularly excellent when the molecular weight was 20000 to 25000. The low molecular weight (10000 to 15000) polyurethane polyol carried out for the purpose of increasing the adhesive strength was thought to reduce the curing agent, but could not solve the problem of adhesive residue. In addition, for the purpose of solving the problem of adhesive residue, the adhesive having a reduced curing agent with respect to the first liquid having a molecular weight (25000 to 30000) was poor in coatability and the filter was also removed.

  By the way, the blending ratio specified by the manufacturer of the curing agent with respect to polyurethane polyol C (molecular weight 20000) is 4 parts by weight. However, as shown in Comparative Example 7 in Table 2, it can be seen that an adhesive residue occurs at a blending ratio of 4 parts by weight. This is considered to be due to the fact that the proper value of the blending ratio recommended by the manufacturer is not for the nonwoven fabric.

  For this reason, in order to achieve the object of the present invention, the amount of the curing agent is examined separately from the blending ratio specified by the manufacturer, and the blending ratio is set to 6 to 8 parts by weight outside the manufacturer's designation. The desired adhesive force required for the filter was obtained, and the desired result that no adhesive residue was observed was obtained. Such a pressure-sensitive adhesive was able to obtain a filter suitable for an air conditioner. That is, as shown in the “Evaluation” column of Table 2, the filter of the comparative example had a practical problem (×), whereas the filter of the example had a high practicality (◯). It was.

Claims (7)

A filter that is used by attaching it to the cover that covers the air intake of the air conditioner,
(1) The filter includes a non-woven fabric and an adhesive layer formed on the entire surface or a part of one surface of the non-woven fabric,
(2) The pressure-sensitive adhesive layer is formed of a two-component mixed polyurethane pressure-sensitive adhesive containing a main agent and a curing agent,
(3) The main agent includes a polyurethane polyol having a molecular weight of 15,000 to 25000,
(4) The curing agent is contained in 6 to 8 parts by weight with respect to 100 parts by weight of the main agent.
This is a filter for air conditioner intakes. The air-conditioner inlet filter according to claim 1, wherein the pressure-sensitive adhesive further comprises 0.25 to 0.5 parts by weight of an ultraviolet absorber with respect to 100 parts by weight of the main agent. Nonwoven, a thickness 1.0~2.0mm and basis weight 20 to 50 g / ^{m 2,} air conditioning inlet filter according to claim 1 or 2. The air-conditioning intake port filter according to any one of claims 1 to 3, wherein the curing agent is an aliphatic polyfunctional isocyanate. The air conditioner air inlet filter according to any one of claims 1 to 4, wherein a surface of the cover is resin-coated or textured. The air inlet filter according to any one of claims 1 to 5, wherein the area ratio of the pressure-sensitive adhesive layer to the nonwoven fabric is 10 to 30%. The air conditioner air inlet filter according to any one of claims 1 to 6, wherein a release sheet is further laminated on the adhesive layer.