JP2011126935A - Detergent for resin board with silicone-based hard-coat and method for cleaning resin board with silicone-based hard-coat - Google Patents

Abstract

The present invention provides a cleaning agent that removes water scale adhered to a resin substrate with a silicone hard coat without damaging the silicone hard coat.
A surfactant, acidic ammonium fluoride, and water are contained, and the content of the acidic ammonium fluoride is 0.5 to 3.0% by mass of the total amount.
[Selection figure] None

Description

  The present invention relates to a cleaning agent for a resin substrate with a silicone hard coat and a method for cleaning a resin substrate with a silicone hard coat.

In recent years, the demand for transparent resin substrates has increased as an alternative to inorganic glass plates. In particular, aromatic polycarbonate-based resin substrates are excellent in fracture resistance, crush resistance, flame resistance, transparency, lightness, easy processability, etc. Yes.
However, such a resin substrate has problems in terms of scratch resistance and weather resistance as compared with an inorganic glass plate.
Therefore, for the purpose of improving scratch resistance and weather resistance, various hard coats (particularly silicone hard coats) formed on the surface of a resin substrate have been proposed.

JP 2006-290942 A Japanese Patent Laid-Open No. 2005-8828

  By the way, in the case where a silicone hard coat is formed on the surface of a resin substrate (hereinafter referred to as “resin substrate with a silicone hard coat”), the water repellency function of the silicone hard coat is initially exhibited. There is little adhesion of dirt. However, after 1-2 years of outdoor use, the water-repellent function is lowered, and dirt such as scale is likely to adhere. Adhering dirt such as water stains impairs the aesthetics of the resin substrate, lowers the transparency of the transparent resin substrate, makes it difficult to secure a field of view, and causes a safety problem.

In order to remove such scale, it is conceivable to use a conventional cleaning agent. Examples of conventional cleaning agents include glass cleaning agents, neutral detergents, and abrasive-containing cleaning agents.
Patent Document 1 discloses that a hard surface cleaning composition comprising a polyetheramine compound (A) having a specific nitrogen content and a water-soluble polyether solvent (B). Product "and that it may further contain a nonionic surfactant. The hard surface is metal, plastic, glass, ceramics, concrete or the like.
Further, Patent Document 2 describes a vehicular descaling poultice containing a chelating agent.

However, an alkaline detergent that is a glass detergent dissolves the silicone hard coat. Further, the amine-based cleaning agent, which is another glass cleaning agent, erodes the aromatic polycarbonate-based resin substrate itself. Therefore, any glass cleaning agent cannot be used for a resin substrate with a silicone hard coat.
Also, with neutral detergents, organic soils can be cleaned relatively well, but scales cannot be removed at all.
In addition, in the cleaning agent containing an abrasive, the surface is cleaned by scraping off the scale with the abrasive, but since the silicone hard coat is generally softer than the abrasive, the silicone hard coat is also scraped. Abrasion resistance, water repellency, durability, weather resistance, etc. of the resin substrate with a silicone hard coat are lowered.
Furthermore, Patent Documents 1 and 2 describe removing scales adhered to a base material used in a vehicle body such as a slate plate or a steel plate, but a description of a resin substrate with a silicone-based hard coat is described. Absent.

  Then, an object of this invention is to provide the cleaning agent which removes the water scale adhering to the resin substrate with a silicone type hard coat, without damaging the silicone type hard coat.

As a result of intensive studies to solve the above-mentioned problems, the present inventor has a silicone hard coat with a detergent containing 0.5 to 3.0% by mass of acidic ammonium fluoride in a surfactant. The present inventors have found that the water scale adhering to the resin substrate can be removed without damaging the silicone hard coat, thereby completing the present invention.
That is, the present invention provides the following (1) to (5).

  (1) With a silicone-based hard coat, which contains a surfactant, acidic ammonium fluoride, and water, and the content of the acidic ammonium fluoride is 0.5 to 3.0% by mass of the total amount Cleaning agent for resin substrates.

  (2) The cleaning agent for a resin substrate with a silicone hard coat according to (1), wherein the pH is 3.5 to 5.2.

  (3) The cleaning agent for a resin substrate with a silicone hard coat according to (1) or (2), wherein the surfactant is an anionic surfactant.

  (4) The ratio of the number of T units to the total number of M units, D units, T units, and Q units on the surface of the resin substrate with a silicone hard coat is 50 to The resin substrate with a silicone hard coat having a silicone hard coat, which is a cured product of a hard coat agent composition containing 100% organopolysiloxane, according to any one of (1) to (3) above. Cleaning agent for resin substrates with silicone hard coat.

  (5) Silicone containing a surfactant, acidic ammonium fluoride, and water, and using a cleaning agent in which the content of acidic ammonium fluoride is 0.5 to 3.0% by mass of the total amount Cleaning method for resin substrates with hard coating.

  According to the present invention, it is possible to remove scale adhering to a resin substrate with a silicone hard coat without damaging the silicone hard coat.

<Cleaning agent for resin substrate with silicone hard coat>
The cleaning agent for a resin substrate with a silicone hard coat of the present invention (hereinafter also referred to as “the cleaning agent of the present invention”) contains a surfactant, acidic ammonium fluoride, and water. Is 0.5 to 3.0 mass% of the total amount.
Hereinafter, each component contained in the cleaning agent of the present invention will be described.

(Surfactant)
Examples of the surfactant contained in the cleaning agent of the present invention include anionic surfactants, nonionic surfactants, zwitterionic surfactants, and the like. You may use together.

  Specific examples of the anionic surfactant include sodium dodecylbenzenesulfonate, sodium arylalkylpolyethersulfonate, 3,3-disulfone diphenylurea-4,4-diazo-bis-amino-8-naphthol. -6 sodium sulfonate, ortho-carboxybenzene-azo-dimethylaniline, 2,2,5,5-tetramethyl-triphenylmethane-4,4-diazo-bis-β-naphthol-6-sodium sulfonate, etc. Sulfate salt of sodium dodecyl sulfate, sodium tetradecyl sulfate, sodium pentadecyl sulfate, sodium octyl sulfate, etc .; sodium oleate, sodium laurate, sodium caprate, sodium caprylate, sodium caproate, And the like; potassium phosphate, fatty acid salts such as calcium oleate.

  Specific examples of nonionic surfactants include polyethylene oxide, polypropylene oxide, combinations of polypropylene oxide and polyethylene oxide, esters of polyethylene glycol and higher fatty acids, alkylphenol polyethylene oxide, higher fatty acids and polyethylene glycols. Examples include esters, esters of higher fatty acids and polypropylene oxide, sorbitan esters, and the like.

  Examples of the zwitterionic surfactant include those having a carboxylate, phosphate, phosphate ester salt as the anion part, and an amine salt or quaternary ammonium salt as the cation part. Specifically, amphoteric surfactants such as betaine type and glycine type are listed.

  Among these, it is preferable to use an anionic surfactant because it has excellent hard water resistance and good foaming properties, and among them, sulfate ester salts and sulfonate ester salts are more preferable.

(Acidic ammonium fluoride)
The content of acidic ammonium fluoride (NH ₄ F · HF) contained in the cleaning agent of the present invention is 0.5 to 3.0% by mass of the total amount of the cleaning agent of the present invention, and 0.5 to It is preferable that it is 1.0 mass%. This is because when the content is less than 0.5% by mass, the scale cannot be removed, and when the content is too large, the silicone hard coat is dissolved. That is, if the content of the acidic ammonium fluoride is within this range, only the scale adhering to the resin substrate with a silicone hard coat can be effectively removed.

Here, the conventional “water scale adhering to the inorganic glass plate” will be described. The main components of the inorganic glass plate are silica sand (SiO ₂ ), soda ash (Na ₂ O), and lime (CaO). When moisture adheres to the surface of such an inorganic glass plate for a long period of time, soda ash is hydrolyzed and remains on the surface of the inorganic glass plate as an alkaline liquid (NaOH). In this state, when drying and wetting are repeated or chemical action is caused by carbon dioxide (CO ₂ ), sulfur oxide (SO _X ), or nitrogen oxide (NO _X ) in the atmosphere, sodium carbonate is caused by a chemical reaction. (Na ₂ CO ₃ ) is produced. These product substances (NaOH, Na ₂ CO ₃ ) gradually cause chemical changes on the surface of the inorganic glass plate. In addition, it reacts with calcium ions and magnesium ions in the atmosphere to produce carbonate. This is “water scale adhering to the inorganic glass plate”, and the main component is carbonate represented by sodium carbonate, calcium carbonate, and magnesium carbonate.

  On the other hand, “water scale adhering to a resin substrate with a silicone-based hard coat” includes inorganic fine particles derived from aluminum, iron, manganese and the like and organic components according to various analyses.

  The generation mechanism of “water scale adhering to a resin substrate with a silicone hard coat” will be described. Dust attached to a resin substrate with a silicone hard coat is less likely to adhere due to its water repellent function while the resin substrate with a silicone hard coat is new, because the formed film has excellent water repellency. . However, since the water-repellent function of the silicone hard coat is higher than the surface of the inorganic glass plate, depending on the degree of contamination of the adhering water, the non-volatile components in the water remain on the surface of the film as they are and follow the trace of water flow. Water droplets may adhere like water drops. Further, when exposed outdoors for 1 to 2 years, the water-repellent function of the coating partly deteriorates, so that dirt derived from organic components such as dust and oil in the atmosphere tends to adhere. In addition, when moisture such as rain on the coating surface evaporates after raining, dust and dirt components or inorganic fine particles in the atmosphere are concentrated in the process of evaporation, so that the organic components serve as binders and take in the inorganic fine particles firmly. It is guessed. This is “water scale adhering to a resin substrate with a silicone hard coat”.

As described above, “scale adhered to a resin substrate with a silicone-based hard coat” is greatly different from “scale adhered to an inorganic glass plate” even though the same “scale” is described.
According to the cleaning agent of the present invention, it is possible to remove both organic dirt and inorganic dirt. Therefore, the cleaning agent showed extremely effective cleaning power against “water scale adhering to the resin substrate with silicone hard coat”. It is considered a thing.

(water)
The cleaning agent of the present invention contains, for example, water such as ion exchange water as a solvent. The mass ratio of the surfactant to the water (surfactant / water) is preferably 1/1 to 1/5, and more preferably 1/2 to 1/4. In some cases, alcohol may be used together with water.

(Additive)
The cleaning agent of the present invention can contain known additives as necessary. Examples of such additives include builders (cleaning aids) that increase the detergency of the surfactant, antioxidants, thickeners, fluorescent agents, fragrances, and coloring agents.

(PH)
The pH of the cleaning agent of the present invention is adjusted, for example, according to the content of the acidic ammonium fluoride, and is preferably 3.5 to 5.2, more preferably 4.0 to 5.0. If pH is this range, the scale adhering to the resin substrate with a silicone type hard coat can be removed more effectively.
In addition, the measuring method of pH is based on JISZ8802-1984.

  The manufacturing method of the cleaning agent of the present invention is not particularly limited. A commercially available or synthesized anionic surfactant, nonionic surfactant, aqueous solution having an amphoteric surfactant or an aqueous solution partially containing alcohol can be produced by mixing a predetermined amount of ammonium acid fluoride. . That is, when used as a cleaning agent, the content of the solvent and ammonium acid fluoride is adjusted so that the content of ammonium acid fluoride is 0.5 to 3.0% by mass with respect to the total amount of the cleaning agent. do it. Therefore, what contains surfactant and acidic ammonium fluoride as a washing | cleaning agent, and adds water and alcohol which are a solvent at the time of use is also contained in this invention. Of course, the present invention also includes a concentrated solution that is thicker than the concentration used and can be diluted with water or alcohol.

<Resin substrate with silicone hard coat>
Next, a resin substrate with a silicone hard coat in which the cleaning agent of the present invention is used will be described.
The above-mentioned resin substrate with a silicone hard coat is formed by applying a hard coat agent composition described later on the surface of a resin substrate described later to form a coating film, and curing the curable organopolysiloxane contained in the coating film. It is obtained by using a silicone hard coat.

(Resin substrate)
The color tone of the resin substrate is preferably colorless and transparent or colored and transparent. The thickness and shape of the resin substrate are not particularly limited, and may be a flat plate or curved.
Examples of the resin used as the resin substrate material include polycarbonate resins such as bisphenol A type polycarbonate resin, polystyrene resins, (meth) acrylic resins, polyester resins, polyarylate resins, urethane resins, thiourethane resins, and halogenated bisphenol A. Examples thereof include polycondensates with ethylene glycol, acrylic urethane resins, and halogenated aryl group-containing acrylic resins. Among them, bisphenol A type polycarbonate resins are preferred because they are excellent in impact resistance and flame retardancy.

(Silicone hard coat)
The silicone-based hard coat is obtained from a hard coat agent composition containing an organopolysiloxane. The film thickness of the silicone hard coat obtained is not particularly limited. The organopolysiloxane contained in the hard coat agent composition can be used without particular limitation as long as it is a curable organopolysiloxane.

[Organopolysiloxane]
In general, the organopolysiloxane is composed of Q units (having four hands in which silicon atoms are bonded to oxygen (hereinafter referred to as bonds)) and T units (having one organic group and three bonds in silicon atoms). A silicon-containing bond unit called D unit (a silicon atom has two organic groups and two bonds), M unit (a silicon atom has three organic groups and one bond) Composed.
Among these, curable organopolysiloxane is an oligomeric polymer mainly composed of T units or Q units, a polymer composed only of T units, a polymer composed only of Q units, T units and Q units. There is a polymer composed of These polymers may further contain a small amount of M units and D units.
The constituent component of the film of the resin substrate with a hard coat to which the cleaning agent of the present invention can be applied is a curable organopolysiloxane mainly composed of T units. Hereinafter, unless otherwise specified, curable organopolysiloxane is simply referred to as organopolysiloxane.
In general, the ratio of the number of T units to the total number of M units, D units, T units and Q units in the organopolysiloxane constituting the coating of a resin substrate with a silicone hard coat having a high weather resistance depends on the weather resistance and cracks. From the viewpoint, it is preferably 50 to 100%, more preferably 70 to 100%, and further preferably 90 to 100%. The cleaning agent of the present invention is prominent in a resin substrate with a silicone-based hard coat comprising an organopolysiloxane in which the number of T units relative to the total number of M units, D units, T units, and Q units in the organopolysiloxane is the above ratio. Provides a cleaning effect. The ratio of the number of M units, D units, T units, and Q units can be calculated from the value of the peak area ratio by ²⁹ Si-NMR.

[Hard coat agent composition]
The hard coat agent composition may contain colloidal silica in addition to the organopolysiloxane for improving the scratch resistance. Note that colloidal silica refers to silica fine particles dispersed in water or an organic solvent.
The hard coat agent composition may further contain various additives, a curing catalyst, and the like, and preferably contains an ultraviolet absorber in order to suppress yellowing of the resin substrate.
The hard coat agent composition is prepared, for example, in a form in which organopolysiloxane and optional components are dissolved and dispersed in a solvent such as alcohol.

(Primer layer)
The said resin substrate with a silicone type hard coat may have a primer layer which improves both adhesiveness between a resin substrate and a silicone type hard coat. The thickness of the primer layer is preferably 0.1 to 10 μm, and more preferably 2 to 5 μm.
Although it does not specifically limit as a primer layer, It is preferable that it is a layer formed by apply | coating to a resin substrate and drying the primer composition containing an acrylic polymer, a ultraviolet absorber, and a solvent.
Examples of the acrylic polymer include homopolymers of (meth) acrylic acid alkyl esters having an alkyl group having 6 or less carbon atoms, and copolymers of these monomers. The mass average molecular weight is preferably 20000 or more from the viewpoint of adhesion.
As the ultraviolet absorber, the same ultraviolet absorbers contained in the hard coat agent composition can be used.
The solvent is not particularly limited as long as the acrylic polymer can be stably dissolved.

The method for removing the water scale adhering to the resin substrate with a silicone hard coat with the cleaning agent of the present invention is not particularly limited, and a conventionally known method can be adopted.
For example, a method of applying the cleaning agent of the present invention to the surface of a resin substrate with a silicone-based hard coat with a sponge or the like, scrubbing, and then washing with water can be used. Further, if necessary, a polishing machine such as a polisher can also be used. Further, a method of impregnating the liquid absorbent base material with the cleaning agent of the present invention on the surface of the resin substrate with a silicone hard coat, removing it, and washing with water can also be used.

<Cleaning agent>
Example 1
In a 50 mL polypropylene container, 15 g of sodium dodecyl sulfate (manufactured by Junsei Chemical Co., Ltd.), 35 g of ion-exchanged water, and 0.5 g of ammonium fluoride (manufactured by Junsei Chemical Co., Ltd., the same shall apply hereinafter) 0.5 g 1 cleaning agent was obtained. The obtained cleaning agent was a uniform milky white solution, its acid ammonium fluoride content was 0.99% by mass, and its pH was 4.5.

(Example 2)
In a 50 mL polypropylene container, 50 g of household detergent “Charmy V Quick” (manufactured by Lion Co., Ltd., neutral-weakly acidic, 30% by weight surfactant blended product, the same applies hereinafter), and ammonium ammonium fluoride 5 g was added and stirred well to obtain the cleaning agent of Example 2. The obtained cleaning agent was a uniform milky white solution, its acid ammonium fluoride content was 0.99% by mass, and its pH was 4.5.

(Example 3)
In a 50 mL polypropylene container, 10 g of “Family Fresh” which is a household detergent (manufactured by Kao Corporation, neutral-weakly acidic, 22 mass% surfactant blended product, the same applies hereinafter) and 0.1 g of ammonium ammonium fluoride Was added and stirred well to obtain the cleaning agent of Example 3. The obtained cleaning agent was a uniform milky white solution, its acid ammonium fluoride content was 0.99% by mass, and its pH was 4.5.

Example 4
In a 50 mL polypropylene container, 50 g of “Chammy V Quick”, a household detergent, and 0.35 g of ammonium acid fluoride were added and stirred well to obtain the cleaning agent of Example 4. The obtained cleaning agent was a uniform milky white solution, its acidic ammonium fluoride content was 0.70% by mass, and its pH was 5.0.

(Example 5)
In a 50 mL polypropylene container, 50 g of “Chammy V Quick” as a household detergent and 1.40 g of ammonium ammonium fluoride were added and stirred well to obtain the cleaning agent of Example 5. The obtained cleaning agent was a uniform milky white solution, its acidic ammonium fluoride content was 2.7% by mass, and its pH was 4.0.

(Comparative Example 1)
55% hydrofluoric acid (manufactured by Junsei Chemical Co., Ltd.) was diluted with ion-exchanged water to prepare 1% by mass hydrofluoric acid. The pH of the obtained cleaning agent was 2.5.

(Comparative Example 2)
In a 50 mL polypropylene container, 10 g of “Charmy V Quick” and 0.53 g of ammonium ammonium fluoride were added and stirred well to obtain the cleaning agent of Comparative Example 2. The obtained cleaning agent was a uniform milky white solution, its acidic ammonium fluoride content was 5.0% by mass, and its pH was 3.0.

(Comparative Example 3)
In a 50 mL polypropylene container, 10 g of “Charmy V Quick”, 0.05 g of ammonium ammonium fluoride and 2 g of tap water were added and stirred well to obtain the cleaning agent of Comparative Example 3. The obtained cleaning agent was a uniform milky white solution, its acidic ammonium fluoride content was 0.41%, and its pH was 5.5.

(Comparative Examples 4 to 11)
“Uroko Cut” (manufactured by Car Wash Kingdom Co., Ltd.), which is a descaling agent for glass, was used as the cleaning agent of Comparative Example 4. The pH was less than 0.5.
“Diaglanz cerium” (manufactured by Garshine Co.), which is a glass scale abrasive, was used as the cleaning agent of Comparative Example 5.
The iron powder remover “Iron Cut” (manufactured by Car Wash Kingdom) was used as the cleaning agent of Comparative Example 6.
“Crinkle” (manufactured by Car Wash Kingdom Co., Ltd.), which is a clay exclusively used for removing iron powder and the like, was used as the cleaning agent of Comparative Example 7.
“Charmy V Quick” was used as the cleaning agent of Comparative Example 8. The pH was 6-7.
“Family Fresh” was used as the cleaning agent of Comparative Example 9. The pH was 6-7.
“Kaneyon S” (manufactured by Kaneyo Soap Co., Ltd.), a cleanser for kitchens, was used as the cleaning agent of Comparative Example 10.
“Saint Paul” (manufactured by Dainippon Insect Chrysanthemum Company), which is a detergent for sanitary containers, was used as the detergent of Comparative Example 11. The pH was less than 1.

<Cleaning test>
First, a 3 mm thick Lexan (registered trademark) Margard, which is a resin substrate with a silicone hard coat (hereinafter referred to as “polycarbonate plate with a silicone hard coat”) using a polycarbonate plate made of a polycarbonate resin as a resin substrate. MR5E (manufactured by SABIC Innovative Plastics Co., Ltd., silicone hard coat: film thickness 4-7 μm, ratio of the number of T units 100%) was placed outdoors for 12 months to adhere scales.
Next, the cleaning agents of Examples 1 to 5 and Comparative Examples 1 to 6 and 8 to 11 were applied with a cotton swab to a polycarbonate plate with a silicone hard coat to which water scale had adhered, and lightly rubbed. After standing for 10 minutes, it was washed thoroughly with tap water, and the state of the scale adhering to the polycarbonate plate with the silicone hard coat was evaluated visually in the following four stages. The evaluation results are shown in Table 1. In addition, after using the comparative example 7 by the product predetermined method, it washed sufficiently with tap water, and evaluated by visual observation similarly to the above.
1: Very good descaling 2: No descaling 3: Silicone hard coat dissolves 4: Silicone hard coat is damaged

As shown in Table 1, according to the cleaning agents of Examples 1 to 5, it was found that the water scale adhered to the resin substrate with the silicone hard coat could be removed without damaging the silicone hard coat.
On the other hand, it was found that the cleaning agents of Comparative Examples 1 to 11 were not satisfactory as those for removing scale adhering to the resin substrate with silicone hard coat.

<Weather resistance test>
The same polycarbonate board with a silicone hard coat as used in the cleaning test was prepared. Then, the cleaning agent of Example 2 was applied with a cotton swab to a polycarbonate board with a silicone hard coat to which scale did not adhere, rubbed lightly, left for 10 minutes, and then sufficiently washed with tap water as a “cleaning sample”. It was. On the other hand, a polycarbonate plate with a silicone hard coat to which scale did not adhere and which was not cleaned with a cleaning agent was designated as “uncleaned sample”.
Using “Daipura Metal Weather KU-R4” (manufactured by Daipura Wintes Co., Ltd.), an accelerated weathering tester using a metal halide lamp as a light source for “cleaned sample” and “uncleaned sample” Three conditions of irradiation, condensation, and darkness were loaded continuously.
・ Irradiation conditions: Light irradiation for 4 hours under the conditions of illuminance of 90 mW / cm ² , black panel temperature of 63 ° C. and relative humidity of 70%. • Condensation conditions: Black under conditions of 98% relative humidity without light irradiation The panel temperature is naturally cooled from 70 ° C. to 30 ° C. and held for 4 hours. Dark conditions: without irradiation, light is maintained for 4 hours under conditions of a black panel temperature of 70 ° C. and a relative humidity of 90%.

  When the appearance of the silicone-based hard coat after 192 hours was visually observed to determine the presence or absence of an abnormality, no abnormality in the appearance was observed in both cases. From this, it was found that the weather resistance of the resin substrate with a silicone hard coat does not deteriorate by the cleaning of the cleaning agent of the present invention.

(Example 6)
Add 25 parts by mass of distilled water and 5 parts by mass of acetic acid to 25 parts by mass of “Snowtex 30” (manufactured by Nissan Chemical Industries, Ltd., solid content concentration: 30% by mass), which is a water-dispersed colloidal silica dispersion. Then, 32.5 parts by mass of methyltrimethoxysilane was added to this dispersion. To this reaction liquid obtained by stirring this mixed liquid at 25 ° C. for 1 hour, 7.5 parts by mass of “colcoat 40” (manufactured by Colcoat Co.), which is ethyl polysilicate, and 0.4 mass of sodium acetate as a curing catalyst Were mixed with each other and diluted with 50 parts by mass of isopropanol to prepare a coating solution. The ratio of the number of T units was 91% (the ratio of the number of Q units was 9%). This coating solution is applied to a polycarbonate plate with an acrylic primer, and cured at 120 ° C. for 1 hour to form a silicone hard coat with a film thickness of 3.6 μm. A cleaning test was conducted in the same manner as the above cleaning test using the cleaning agent of Example 1. The evaluation result was “1: Very good dripping off”.

Claims (5)

Contains a surfactant, acidic ammonium fluoride, and water,
A cleaning agent for a resin substrate with a silicone hard coat, wherein the content of the acidic ammonium fluoride is 0.5 to 3.0% by mass of the total amount.   The detergent for resin substrates with a silicone type hard coat of Claim 1 whose pH is 3.5-5.2.   The cleaning agent for a resin substrate with a silicone hard coat according to claim 1 or 2, wherein the surfactant is an anionic surfactant. The resin substrate with the silicone hard coat is
Hard coating agent containing organopolysiloxane having a ratio of the number of T units to the total number of M units, D units, T units and Q units on the surface of a resin substrate which is a polycarbonate plate is 50 to 100% It is a resin substrate with a silicone hard coat having a silicone hard coat that is a cured product of the composition,
The cleaning agent for resin substrates with a silicone type hard coat in any one of Claims 1-3. Contains a surfactant, acidic ammonium fluoride, and water,
A method for cleaning a resin substrate with a silicone-based hard coat, wherein a cleaning agent having an acid ammonium fluoride content of 0.5 to 3.0% by mass of the total amount is used.