JPS6158507B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a surface protectant composition for articles. Automobiles and large machinery are stored outdoors or transported by train, ship, truck, etc. without being wrapped in wooden boxes or cases, so their painted or plating surfaces are susceptible to scratches due to contact or falling from the atmosphere. thing,
For example, contamination from iron powder, soot, dust, bird droppings, etc. can impair the aesthetic appearance, and wind and rain containing salt, acidic substances, etc. can cause damage such as rusting and corrosion of the plating parts, which is a major problem. It is becoming. There is a need for improved protection methods to prevent these damages. Moreover, it is strongly desired that this protection method be able to be easily removed when the protection is no longer needed. In response to these demands, many methods have been studied and many patents have been published. Table 1 shows the advantages and disadvantages of the methods that have been studied so far. Table 1
As can be seen from the above, protection ability and ease of removal are contradictory properties, so there is currently no sufficient product available. The present inventors have completed the present invention after thoroughly studying the advantages and disadvantages of conventional methods. The composition of the present invention contains 2 to 98 parts by weight of wax, has a melting point of 100°C or higher, is insoluble or sparingly soluble in water, and has a particle size of 100 μm.
It is characterized by containing 1 to 49 parts by weight of the following organic and/or inorganic powders and 1 to 49 parts by weight of tetrafluoroethylene polymer powder (hereinafter referred to as TFE polymer) with a molecular weight of 100,000 or less, and is coated with wax. This method maintains good protection ability and provides ease of removal.

【table】

[Table] To explain in more detail, the most important point of the present invention is that the wax contains a TFE polymer. Conventionally, it has been considered to incorporate powders of various organic and inorganic substances into the wax in order to improve the removability of the wax coating method, but since it is necessary to contain a large amount of powder, the wax coating method has been considered. The excellent protection properties of the material are lost, and the protection properties against permeable substances such as rust and bird droppings are reduced by half or almost non-existent. Furthermore, no improvement in removability was observed when a small amount of powder was added to the wax. As a result of various studies aimed at improving this point, the present inventors found that by incorporating a TFE polymer into the wax as in the present invention, it is possible to create a composition that has both excellent protective ability and easy removability. I found it.
There are many types of TFE polymers, ranging from liquids to solids, depending on the degree of polymerization.
It is called TFE wax and has a powdery appearance, but when it is evenly pressed onto a metal or painted surface, it has wax-like properties and is suitable as a TFE polymer. When a conventionally used high-molecular-weight TFE polymer powder was used instead of the TFE polymer in the present invention (Comparative Example 6), an effect on water repellency was observed; Character does not improve. On the other hand, when using TFE polymer (Examples 1 and 2), chemical resistance,
It has remarkable effects of imparting non-stick properties, water repellency, oil repellency, etc.
It also has excellent removability. Furthermore, if ethylene or propylene polymer powders having a relatively low molecular weight are used, they will dissolve in the wax due to their compatibility with the wax, and no removability effect can be expected. The present invention is characterized by the discovery that TFE polymer has unique properties not found in general inorganic materials, organic polymers, and oligomers, and the addition of this to wax.
or more, insoluble or poorly soluble in water, and particle size
The present invention maintains excellent protective properties as a surface protective agent that could not be obtained conventionally by adding organic and/or inorganic powders of 100μ or less in size, and also has easy removability when no longer needed. The product was obtained. The mixing ratio of each component in the composition of the present invention is determined depending on the required degree of protective ability and required degree of removability, but generally the wax is 2 to 98 parts by weight, has a melting point of 100°C or higher, is insoluble in water, or has a melting point of 100°C or higher. It is necessary to use 1 to 49 parts by weight of an organic and/or inorganic powder that is poorly soluble and has a particle size of 100 μm or less, and 1 to 49 parts by weight of the TFE polymer. If the wax is not contained in an amount of at least 2 parts by weight, the formation of a continuous protective film will be insufficient and the protective ability will be reduced. Moreover, if it exceeds 98 parts by weight, the performance will be the same as that of wax alone, making it difficult to remove. If at least 1 part by weight or more of organic and/or inorganic powder with a melting point of 100°C or higher, insoluble or poorly soluble in water, and a particle size of 100μ or less is not included, only the wax-like properties of the TFE polymer will appear and the removability will deteriorate. No improvement observed. When the content is 49 parts by weight or more, it becomes easy to peel off and the protective ability is extremely reduced. If the TFE polymer does not contain at least 1 part by weight, chemical resistance, non-adhesiveness, water repellency, and oil repellency will not be imparted. If it contains 49 parts by weight or more, TFE
The powdery nature of the polymer becomes strong and it becomes easy to peel off, reducing its protective ability. Waxes that can be used in the present invention include various mineral waxes, animal and vegetable waxes, hydrogenated oils and fats, synthetic waxes, etc. alone or in mixtures, but waxes with a melting point of about 40 to 90°C are preferred for ease of removal, and more preferably It is a semi-microcrystalline wax with a temperature of 50-70℃. Organic and/or inorganic powders include:
It needs to be in a powder form because it coexists with the TFE polymer and works together to maintain the protective properties of the protective film while making it brittle and easy to peel off. must be insoluble or poorly soluble in water at temperatures above 100°C and have a particle size of 100μ or less. These conditions, such as heating, are necessary when using the composition, and if the particle size is larger than the above, the protective ability will be insufficient. Further, it is necessary that it is insoluble in the dispersion medium used for coating.
Examples include organic powders such as powders of polymer compounds such as nylon, polyethylene, and phenolic resins; and calcium carbonate, talc, silicic anhydride, bentonite, and ummo as inorganic powders. Calcium carbonate, talc, and bentonite are suitable from the viewpoint of price and availability. TFE polymer is generally referred to as TFE wax and has a molecular weight of about 100,000 or less.
A powder that has a molecular weight of about 1000 or more, and can be produced by telomerization, thermal decomposition, radiolysis, etc., but from the viewpoint of dispersibility, the particle size should be 50 μm.
Below, preferably 20μ or less. From the viewpoint of workability, it is preferable to apply the composition of the present invention to the surface to be protected by dissolving and suspending it in a volatile solvent. The volatile solvent should be determined depending on the condition (material) of the surface to be applied, and should not attack these surfaces. Aliphatic hydrocarbon solvents are generally preferred. The amount of solvent to be used should be determined depending on the coating conditions, but if it is too small, gelation will occur, so it is necessary to use at least 100 parts by weight per 100 parts by weight of the above mixture. Furthermore, the use of a large amount of solvent is disadvantageous from the economical and pollution standpoints. Therefore, it is desirable that the amount is about 100 to 300 parts by weight per 100 parts by weight of the above mixture. In addition, as one mode of use,
It is also possible to mix the three components, heat them, cast them, cool and solidify them to form a molded product, which is then melted and applied. Furthermore, it is also effective to add an antioxidant and an ultraviolet ray inhibitor to the composition of the present invention to improve the weather resistance of the wax, and an anti-rust additive to improve the rust-preventing property of the plating part. Possible methods for removing the protective film of the present invention include manual wiping, mechanical cleaning, etc., but hot water cleaner (hot water temperature 65-75℃, jetting pressure 50-80 kg/cm ² , jetting amount
500 to 1500/h) is appropriate. Since this composition is composed only of water-insoluble components, the cleaning waste liquid from the hot water cleaner only needs to be passed through a sand filtration device. It can also be removed using a cleaning device containing steam kerosene or detergent, but this is not suitable because it requires a complicated waste liquid treatment device. For reference, when applying only wax, a steam kerosene cleaner is used. Examples will be described below. Example 1 (1) 500 c.c. of the following composition was heated to 50°C and thoroughly mixed with a high-speed mixer, and applied to a small passenger car using an airless sprayer. After leaving it outdoors for 3 months, it was heated with a hot water cleaner ( Water temperature 65-75℃, jet pressure 70
Kg/cm ² water jet amount 600/h). Cleaning time required: approximately 10 minutes. After cleaning, no abnormalities were observed on the painted surface or plating area, which remained in the same condition as three months ago. (2) Apply the same composition to a painted board (450 x 600 x 1 mm) coated with amino alkyd using the same method as in (1).
(A) Near a tree where birds gather (B) After being left in a dusty place for 3 months and then cleaned with a hot water cleaner (same as (1)), (A) Paint film on the area where bird droppings have fallen. Change in (B) The adhesion of dust to the paint film was investigated, but no abnormality was observed. At the same time, yellow stains were observed in the areas where bird droppings had fallen on painted boards that had been left without applying this composition. In addition, reddish-brown spots that appeared to be iron powder in the dust were observed. Composition Weight semi-microcrystalline wax (MP60
°C) 20 parts by weight Precipitated calcium carbonate 10〃 TFE polymer oligomer (average particle size 10μ, average degree of polymerization 500) 10〃 Mineral spirits 60 parts by weight (3) Mild steel plate washed with the same composition (SPC70×150
x 1mm) using the same method as in (1), left it outdoors for 3 months, washed it with a hot water cleaner (same as in (1)), and then examined the state of rust on the mild steel plate. It wasn't recognized. At the same time, rust was observed on the entire surface of the mild steel plate that was left without being coated with this composition. The compositions and test results of Examples 1 to 8 and Comparative Examples 1 to 7 are shown in Table 2.

【table】

[Table] As can be seen from the above results, the present invention is effective for wax, tetrafluoroethylene oligomer, organic matter and/or
It is clear that the use of inorganic powder in a specific range provides superior protection and removability compared to conventional methods.

Claims (1)

[Scope of Claims] 1 a Wax 2 to 98 parts by weight, b Tetrafluoroethylene polymer powder having a molecular weight of 100,000 or less 1 to 49 parts by weight, c Melting point of 100°C or higher, insoluble or sparingly soluble in water, and particle size A surface protective agent composition for an article, comprising 1 to 49 parts by weight of organic and/or inorganic powder having a size of 100 μm or less. 2. The composition according to claim 1, wherein the tetrafluoroethylene polymer powder is a tetrafluoroethylene wax powder. 3. The composition according to claim 1, wherein the wax is a semi-microcrystalline wax with a melting point of 60°C. 4. The composition according to claim 1, wherein the organic and/or inorganic powder is a fine powder of calcium carbonate.