JP2001200298A - Sponge for cleaning containing abrasive material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a sponge containing an abrasive material for easily cleaning stains such as fur and the like stuck on an automobile without damaging a coated surface. SOLUTION: The sponge containing an abrasive material is obtained by incorporating a pore-forming agent, an acetalizing agent and an acid catalyst into a polyvinyl alcohol aqueous solution, and further admixing therewith plate- like abrasive grains having an average particle size of 2-7 μm exhibiting abrasive effects, casting the resultant solution, solidifying it to an appropriate degree, casting thereon a sponge-forming liquid not containing abrasive grains, solidifying it and cleaning the resultant sponge.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sponge for cleaning cars, glass, pottery products, and the like, and more particularly to a sponge containing an abrasive for cleaning which is convenient for descaling a painted portion of a car.

[0002]

2. Description of the Related Art Conventionally, a manual cleaning of a car is performed by urethane sponge or polyvinyl acetal (hereinafter, PVAt).
) -Based sponge or the like is used. The PVAt sponge is hydrophilic, has continuous pores, and is excellent in elasticity, but it was not possible to sufficiently remove scale by a usual cleaning method, that is, only by physically rubbing. For this reason, when washing a car, a shampoo for a car has been used to make it easy to ionize, or a detergent containing a compound has been used. However, the use of these detergents complicates the operation and consumes a large amount of the detergent, which has the problem of wasting resources and contributing to environmental pollution.

JP-A-10-130634 discloses an abrasive-containing PVA in which fine particles having an abrasive action are fixed.
Although t-sponges have been disclosed, close attention has to be paid to the particle size of the fine particles in order not to damage the painted surface.

[0004]

The present inventors have conducted intensive studies to solve the above-mentioned drawbacks, and as a result, have found that the average particle size is 2 to 2.
By fixing flat abrasive grains of 7 μm in a sponge, the present inventors have found that a cleaning sponge having an excellent cleaning effect and not damaging the painted surface of a car can be obtained.

[0005]

That is, the gist of the present invention is a sponge made of polyvinyl acetal resin, which has a polishing effect and has an average particle size of 2 to 7 μm. A polishing layer in which the abrasive grains are fixed, and a sponge containing a cleaning abrasive, wherein a sponge layer containing no abrasive grains is laminated, and the amount of the abrasive grains in the polishing layer is added to polyvinyl alcohol. 2 for
It is a sponge containing a polishing abrasive for cleaning, wherein the sponge has a surfactant, a builder, and a chelating agent as needed, which is from 00 to 600%.

Hereinafter, the present invention will be described in detail. Here, for convenience, car washing is described, but enamel products,
It goes without saying that it is also effective for washing kitchen plumbing goods and bathtubs. First, the cleaning sponge layer will be described. Essentially, the sponge layer and the sponge layer containing the abrasive are preferably made of the same material from the viewpoint of interface bonding and the like. The sponge layer made of a PVAt-based resin in the present invention refers to a polyvinyl alcohol (hereinafter, referred to as polyvinyl alcohol).
PVA) is used as a main raw material, a soluble substance, a foaming agent, and a foaming agent are added to the pore-forming agent, and mechanical stirring is performed as necessary. Then, crosslinking and insolubilization are performed using an acetalizing agent such as formaldehyde and an acid catalyst. After that, it is manufactured by washing and removing soluble substances and acids.

The PVA used in the present invention is not particularly limited, but has an average polymerization degree of 200 to 5,000, preferably 500 to 2,000, and a saponification degree of 60 to 100.
Mole%, preferably 80 to 100 mol% of PVA is used. If the average degree of polymerization is less than 200, the strength of the resulting sponge is extremely low, which is not preferable.
If it exceeds 000, the viscosity of the PVA aqueous solution becomes too high,
It is not preferable because handling at the time of mixing with other components becomes difficult. On the other hand, if the saponification degree is less than 60 mol%, it is not preferable because it becomes hardly soluble in water.

As the soluble substance to be added as a pore-forming agent in the present invention, known starches such as potato, tapioca and corn starch can be used, which are added to water and heated or gelatinized without heating. There is no particular limitation.

[0009] The foaming agent foams by mechanical stirring and maintains the foam for a long time, and saponin and various surfactants can be used. As the foaming agent, for example, sodium hydrogen carbonate, sodium carbonate, and the like, which react with an acid to generate carbon dioxide gas, can be used. The soluble substance, the foaming agent, and the foaming agent can be used alone or in combination.

Examples of the acetalizing agent for cross-linking and insolubilizing the aqueous PVA solution include formaldehyde, glutaraldehyde, glyoxal and the like. If necessary, a crosslinking agent such as an epoxy can be used in combination.

Next, a polishing layer sponge containing abrasive grains will be described. As described above, the same material is preferably used for forming the polishing layer sponge and the cleaning sponge except that they contain abrasive grains. Also, it can be manufactured by basically the same method. Abrasive grains to be put into the polishing layer include alumina, silicon carbide, silicon nitride, silica sand, diamond, and the like, but are effective for washing scale and do not damage the painted surface, and the average particle size is 2 to 2. 7 μm
Is preferably used. If the average particle size is 7 μm or more, the painted surface is damaged, which is not preferable. If the average particle size is 1 μm or less, the polishing effect is poor, which is not preferable.

[0012] Spherical abrasive grains are more likely to come into contact with the polished surface with lines or surfaces than plate-shaped abrasive grains are in contact with the polished surface at a point, and are polished efficiently without damaging the painted surface. You can do it.

It is preferable to use the same PVA and other materials constituting the sponge layer as those constituting the cleaning sponge layer. Therefore, the P
It is preferable to use a part of the VA solution separately.

The amount of abrasive added is 200 to 600 with respect to PVA.
%, More preferably 300 to 500%. 200 added
%, It is difficult to obtain a sufficient polishing effect, and if it exceeds 600%, the sponge tends to be hard and brittle, which is not preferable.

In adding and fixing the abrasive grains in the sponge, it is convenient to add sodium silicate as a binder. Sodium silicate is particularly effective in preventing the abrasive grains from falling off, particularly in the case of fine abrasive grains. The addition amount of sodium silicate is preferably in the range of 1 to 10% based on the abrasive grains. More preferably, it is in the range of 2 to 5%. Addition amount is 1
If it is less than 10%, the abrasive grains may fall off, and if it exceeds 10%, the flexibility of the sponge is undesirably deteriorated.

Although the cleaning sponge layer and the polishing layer sponge can be joined by an adhesive, they must be qualitatively the same as the PVAt sponge and be flexible after joining. In order to take advantage of the characteristics of sponge, water permeability is required. For these reasons, the use of an adhesive is not preferred. The joining of the two layers can be achieved by casting each stock solution in the same container. However, just casting both stock solutions together
Both undiluted solutions may be mixed. As a method for solving this, first, the stock solution of the polishing layer is cast into a container, the acetalization reaction is started, and when the viscosity of the sponge layer is appropriately increased, the stock solution of the sponge layer may be cast. The time until thickening depends on the amount, but is about 30 minutes at 60 ° C. with the container sealed, and about 2 hours at room temperature.

It is also possible to add a short cut of PVA fiber between layers to prevent mixing of both stock solutions and to prevent peeling of both sponge layers by the anchor effect of the cut yarn. The PVA cut yarn is preferably one having a length of 5 to 15 mm in consideration of the anchor effect and entanglement. The amount of addition is such that it covers the surface of the stock solution of the polishing layer, and is 0.01 to 0.02 g / cm.
A range of ² is preferred.

The laminated sponge thus produced is immersed in a treatment bath comprising a surfactant, a builder and a chelating agent in order to further improve the polishing and washing properties.
As the surfactant, an anionic type, a cationic type, a non-ionic type and the like for general car washing can be used. The builder is to assist the detergency of the surfactant, for example, sodium phosphate, sodium hydrogen phosphate, potassium pyrophosphate, sodium metasilicate, sodium sulfate, sodium carbonate, sodium hydrogen carbonate, sodium citrate, etc. And one or more of them can be used in combination.

The chelating agent has an action of removing metal ions which become an interfering substance at the time of washing, and specific examples thereof include oxycarboxylic acids, polyaminocarboxylic acids, and condensed phosphates.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in more detail with reference to Examples and Comparative Examples, but the present invention is not limited only to the following description without departing from the gist thereof.

[0021]

Example 1 PVA having an average degree of polymerization of 1,200 and a degree of saponification of 99.9 mol% was dissolved in water to a concentration of 20%. to this,
A 50% potato starch by weight ratio to PVA is added as a 15% slurry and stirred at 70 ° C. for 5 minutes to mix PVA,
A starch mixture was obtained. This was used as a stock solution for the polishing layer sponge and a stock solution for the sponge layer.

[Preparation of stock solution for polishing layer] A part (about 10%) of the above mixed solution was fractionated, and the average particle size was 5 μm as abrasive grains.
m plate-like alumina 400% by PVA, alumina
A 73% slurry of 2.2% sodium silicate was added and mixed. In addition, 37% concentration as an acetalizing agent
Of formalin at 37% by PVA, acid catalyst, concentration 49
84.3% of sulfuric acid based on PVA was added and stirred well.

[Preparation of sponge layer stock solution] To the remaining mixed solution, 37% formalin having a concentration of 37% as an acetalizing agent with respect to PVA, and sulfuric acid having a concentration of 49% as an acid catalyst and 84.3% with respect to PVA. Added and stirred well.

[Formation of a sponge layer] A stock solution containing abrasive grains to be a polishing layer is cast into a polyethylene container, which is then sealed and heated at 60 ° C.
The reaction was allowed to proceed for 25 to 35 minutes. When the viscosity reached an appropriate level, the stock solution of the sponge layer was overlaid and laminated.
Allowed to react for hours. After the reaction, it was taken out of the mold, washed with water, and dried with a hot air drier. The obtained dried sponge was immersed in a treatment liquid consisting of 5% of sodium dodecylbenzenesulfonate, 1% of sodium metasilicate, and 1% of EDTA as a cleaning aid. At that time, the weight increase rate of the cleaning aid is 3.5% to 7.5%.
%Met. When the car was washed with the obtained sponge containing abrasives, it was effective for descaling and did not damage the painted surface.

[0025]

Example 2 The method of joining the polishing layer and the sponge layer in Example 1 is as follows, except that a 10 mm long PVA cut yarn is spread on the polishing layer stock solution at 0.01 g / cm ² and then the sponge layer stock solution is laminated and reacted. A sponge was obtained in the same manner as in Example 1. When the car was washed with the obtained washing sponge, it was effective for descaling and did not damage the painted surface. The joining surface was very strong and hard to peel off.

[0026]

Comparative Examples 1 to 4 In Example 1, the amount of abrasive added was
A sponge was obtained in the same manner except that VA, 10%, 50%, 100%, and 200% were used. When the car was washed with the obtained sponge, when less than 200%, the polishing effect was poor, and the car was not sufficiently descalable.

[0027]

Comparative Examples 5 to 6 In Example 1, the average grain size of the abrasive grains was 1
A sponge was obtained in the same manner except that the thickness was changed to 10 μm. A sponge containing 1 μm abrasive grains has a poor polishing effect,
It was not suitable for descaling cars. On the other hand, 10 μm
The sponge containing the abrasive grains was good in polishing effect,
The painted surface was scratched.

[0028]

Comparative Example 7 In Example 1, the bath concentration of sodium dodecylbenzenesulfonate in the treatment liquid to be immersed was 1%,
When the same treatment was performed except that the sodium metasilicate was set to 0.5% and the EDTA was set to 0.5%, the weight increase rate of the cleaning aid was 2% or less, which was slightly inferior to the descaling of the car.

[0029]

According to the present invention, it is possible to easily remove scales that have been difficult to remove at the time of washing a car, and to use a polishing abrasive material that is very suitable for washing a car without damaging the painted surface. Sponges can now be easily obtained.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) C11D 3/33 C11D 3/33 3/36 3/36 (72) Inventor Setsuo Yamada Kyobashi, Chuo-ku, Tokyo F-term (reference) No. 1-2 in Nichibi Co., Ltd. 3C063 AA10 BB03 BB07 BC03 BC09 BE07 EE32 FF23 4H003 AB18 BA16 DA05 DA11 EA15 EA25 EB16 FA05

Claims (3)

[Claims] 1. A sponge made of a polyvinyl acetal resin, comprising: a polishing layer in which flat abrasive particles having an average particle diameter of 2 to 7 μm having a polishing effect are fixed in the sponge; A sponge containing an abrasive for cleaning, wherein a sponge layer having no sponge is laminated. 2. The sponge according to claim 1, wherein the amount of the abrasive added to the polishing layer is 200 to 600% based on polyvinyl alcohol. 3. The sponge according to claim 1, wherein a surfactant, a builder, and a chelating agent are impregnated as necessary.