JPS60223874A - Algicidal paint composition - Google Patents

Abstract

PURPOSE:To provide an algicidal paint compsn. which can inhibit the growth of green algae on a wall over a long period of time when used for the interior or exterior finish of buildings, containing a specified urea derivative as an active ingredient. CONSTITUTION:An algicidal paint compsn. contains 3-(3,4-dichlorophenyl)-1,1- dimethylurea as an active ingredient. This compd. is a non-hormonal systemic herbicide which is known as DCMU, and interferes with photosynthesis of weeds to thereby kill them. Accordingly, the compd. is effective in inhibiting the growth of algae including fresh water and marine green algae or flagellate algae which form chlorophyll. The compd. is incorporated in dry-curing, oxidation- polymerization or reaction-curing type paints, and the paints are then used for the interior or exterior finish of buildings, whereby the growth of algae on a wall can be inhibited over a long period of time.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an anti-algae coating composition. The outer wall of a cold storage warehouse
Damage situations in which green algae are concentrated on the exterior walls of general buildings or the ceilings of bathrooms are often seen. In the case of a cold storage warehouse, this occurs when the external part of the fixing metal of the concrete molded plate connected to the internal cryogenic part cools down due to dew condensation, and moisture in the air appears as water droplets. It is thought that this occurs when green algae spores floating in the air attach to the spores.

Also, in the case of the outer wall of a general building, the inside of the wall is 1 liter.
Condensation occurs due to the influence of water pipes, sewage pipes, etc. with ICs,
This results in the occurrence of green algae.

In addition, in the case of bathroom ceilings, etc., due to water vapor and high ridges,
Conditions are favorable for generation, and it occurs on the surface # of the ceiling.

In order to prevent the growth of green algae, the conventional method was to mix a known fungicide into the paint used to decorate the exterior or interior walls of buildings, but this was not effective and the areas where green algae had grown It is necessary to strip off the paint and reapply paint containing an algae-proofing agent, and from an economic standpoint, a long-lasting algae-proofing agent has been desired.

The present invention is based on the discovery of unique properties of a specific compound based on continuous research. That is, the present invention provides 5-(3,4-dichlorophenyl)-1-
This is an anti-algae coating composition containing monodimethylurea (DCMU) as an active ingredient.

DCMU used in the present invention is a non-hormonal translocated herbicide, which is absorbed through the roots of weeds during soil treatment, moves upwards within the plant body, inhibits photosynthesis, and exhibits herbicidal power.

Since DCMU harms the photosynthetic system of chlorophyll, it can be used as an algae preventive agent in water, as it has the effect of inhibiting the growth of freshwater, seawater green algae, flagellated algae, and other algae that produce chlorophyll. Research has already been conducted on -V.

In carrying out the present invention, the following materials may be used in the composition. That is, dry-curing type, oxidative polymerization type, one-reaction curing type paints, and other architectural finishing materials include wet materials such as spraying materials and repellent wood.

The paint of the present invention can be applied to the exterior and interior of buildings. By using K, the growth of green algae on walls can be prevented for a surprisingly long period of time.

Next, the present invention will be explained by examples.

Example 1 DCMU powder was added to paint V Top (Dainippon Paint ■, acrylic urethane paint) at α5% by weight of paint.

The mixture was added to a concentration of 1.0% and thoroughly mixed and stirred.

Also, a comparative counterintelligence agent, 4-(2-pencils double)
Thiazole was adjusted to α5% and 1.0% in the same way as on the right.

2 as X 2 em in the blood of these paints
The glass surface of each plate was covered with Km cloth, and the Siaret dish was left open in a constant mixing tank set at 10°C, and a type of green algae, Alococcus, was cultured separately. A few drops of the same culture solution were added onto each paint and the development of green algae was investigated after 1, 6 and 12 months.

A control plot containing only paint was treated and investigated in the same manner.

These results are shown below.

Experimental area Months elapsed 1 month 6 months 12 months DCMU, [15% content]--- Lairyo District l Contains 1.0%--- glue area Control area 100m change The symbols in the table are based on the following standards.

-No occurrence + Small amount of occurrence Ox Multi-iIt occurrence Example 2 North 11 of the 6th floor refrigerated warehouse with freezing capacity of -50℃
'l, Suzuka Paint 1) Laughton Roller for external use was used as a spraying material for the exterior of the fixing metal part of the concrete forming board, and D CM U was Q, 30%, 15% by weight of the paint.
% and 1.0% were applied uniformly, and each
Two consecutive test plots of 051 x 50 tx were created.

For comparison, a (15%, tO%) plot was prepared in the same manner using the algae-preventing agent 4-(2-benziidazolyl)thiacykK').

In these test plots, the occurrence of Green I was investigated after 1 year, 2 years, 5 years, 5 years, and 7 years.

The results are shown below.

Experimental area Elapsed years 1255 (η Control area Replacement Cancellation Cancellation - No occurrence + Low incidence High incidence Example 3 1: paint for painting the bathroom ceiling!! The welfare ratio is DCMU is a5%
, and Acrose 100V containing 1.0%
(Dainippon Paint Acrylic Emulsion Paint)
After six months, one year, and two years after application, the occurrence of green algae was examined using AI'J.

In addition, a control plot coated with a paint containing no DCMU was also investigated.

The results are shown below.

Half a year 1 year 2 years Cヱ Not generated + Small amount generated Ox Large amount generated As mentioned above, DCMU has a weight ratio of 0.25 to 0.25 tons compared to paint.
When mixed uniformly with O% paint and used for the exterior or interior of buildings, it is more effective in preventing the growth of green algae on walls for a long period of time. I can do it.

Hodogaya Chemical Industry Co., Ltd. 1 other person

Claims (1)

[Claims] ! An anti-algae coating composition containing 5-(5,4-dichlorophenyl)-1,1-dimethylurea as an active ingredient.