Status and development trends of additives for water-based coatings (5)

tetrachloroisophthalonitrile, or TPN or CLT, commonly known as bacillus. Products are Nopcocide N-96, YC-404, SD-96, etc.
4,5 dichlorine-2-zhengxinki-4 isoprene-3-ketone is known in English as 4,5-dichloro-2-octyl-4-isothiazolin-3-one, or DCOIT. The product is Rozone 2000, which contains 20% DCOIT.
zinc anti-mold anti-algae agent, the English name zinc pyrithione, is zinc chelate, referred to as ZPT. Its structure is as follows:zinc pyrithione has the advantage of a broad antibacterial spectrum and low toxicity, it is not only used as anti-mold anti-algae agent, but also used in shampoos and cosmetics in the world, in shampoo to dedress. It is a broad-spectrum, high-efficiency, low-toxic anti-mold anti-algae agent.
the disadvantage of zinc pyrithione is that it degrades gradually under ultraviolet light. The storage temperature should be above 10 degrees C. Zinc pyrithione precipitates when it is below 1.5 degrees C.
products are Zinc Omacide ZOE, powdered and water-like dispersions.
addition to the above-mentioned anti-mold agent, there are many, such as tetimethyl desulfurization qiuram (thiram), commonly known as Fumei double, the commodity name TMTD and so on.2.5.3. Commonly used anti-algae agent
N
'
-(3,4 dichlorobenzene)-N, N-dimethylate (diuron) is a commonly used anti-algae agent, known in China as the enemy of heron, its structure is as follows.its anti-algae performance is good, the price is moderate, if there are anti-algae requirements, often need to add this part. But it also has the same killing effect on other crops, good at its low water solubility, about 32 mg/kg. Single-member N
'
-(3,4 dichlorobenzene-N), N-dmymethylene products such as Algicide D 500 and Durashield F-500, etc.
2-methyl-4-sbutylamine-6-cyclopropanine-S-triamino (2-methylthio-4-tert-butyl amino-6-cyclopropylamino-s-triazine, or Irgalol) and its variant Terbutryne, are newly developed anti-algae agents and are safe.
zinc pyrithione, in addition to mold prevention, is also a very good anti-algae agent.
2.5.4. Compounding anti-mold anti-algae agents
Many anti-mold anti-algae agents are compounded so that they can complement and synergetic. For example, the Rocima 350 is a duo of DCOIT and IPBC. Rocima 361 is a complex of BCM and N
'
-(3,4 dichlorobenzene-N, N-dimethylene, which is resistant to mold and algae. Mycavoid DFP and Mycavoid DFS are a three-component complex of OIT-IPBC with N
'
-(3,4 dichlorobenzene)-N, N-dmylamine. Mycavoid DFW is a three-component complex of OIT-BCM and N
'
-(3,4 dichlorobenzene-N, N-dimethylene). The Mergal S 90 Paste is a combination of BCM-OIT and 2-methyl-sulfur-4-staddyl-amino-6-cyclopropylamine-S-triazine. Mycavoid DF3 is a three-component complex of OIT and CMIT/MIT, with anti-corrosion and mold protection, and so on.
should be noted that not all complexes complement each other and work together. Whether the compounding can complement each other and synergy depends on the test and the actual use results.2.5.5. The development of preservatives and anti-mold agents
the development of organic and inorganic preservatives and anti-mold agents are briefly described below.
2.5.5.1. Development of organic preservatives and mold inhibitors
Organic preservatives and mold inhibitors are primarily in the direction of chlorine-free, low toxic efficiency, broad spectrum, long-lasting and reduced volatile organic compounds (VOCs).
antiseptics and mold inhibitors are greatly affected by environmental regulations. For example, the European Dangerous Substances Directive states that hazardous materials should be labeled when CMIT/MIT exceeds 15 ppm. As a result, there is a trend to replace CMIT/MIT with CMIT/MIT and BIT composites or BIT/MIT.
The European Guide to Antibacterial Products requires a risk assessment of antimicrobial products, not a risk assessment. Risk assessments obtain toxicity data only on the basis of role and dosing. Risk assessment includes risk assessment and exposure analysis, i.e., time-related concentration analysis of antimicrobial products in the environment
28
, i.e. full life cycle concentration analysis of antimicrobial products.2.5.5.2. The development of inorganic antibacterial agents
in addition to the organic antibacterial agents described above, there is also a class of inorganic antimicrobial agents, is also beginning to be used in coatings. It has a broad antibacterial spectrum, long antibacterial period, low toxicity, no resistance to drugs, good heat resistance.
inorganic antimicrobial agents are a class of antimicrobial agents made from the bactericidal or antibacterial ability of metals such as silver, copper, zinc, titanium and their ions. The most striking is the inorgic metal ion type antibacterial anti-mold agent. People have chosen zeolite, silica ashstone, ceramics, insoluble phosphate and other substances with strong chemical binding force of metal ions as carriers, with silver ion preparation antibacterial
agent

in the coatings industry, common inorganic metal oxide antibacterial agents are nano ZnO and nanoTiO
2
. NanoZnO and nanoTiO
2
a class of photocatalytic inorgic antimicrobial agents.
it has long been known that ZnO has mold-proof function, but to prevent the use of ZnO coating gel problem. ZnO powder has a certain degree of antibacterial properties, but the antibacterial properties are weak, rarely used alone as antibacterial agents. The four-pin ZnO wafer and nano ZnO composite have good antibacterial resistance and can be used as antibacterial agents. Its minimum antibacterial concentration (MIC) is 150-300mg/kg, and its LD
50
is greater than 10000mg/kg, which is a non-toxic product.
nanoTiO
2
catalytic inorgic antibacterial agents are generally used in sharp titanium-type TiO
2
. It has a good antibacterial effect.
development of other additives
other additives, such as: 2.6.1nm TiO
2
photocatalyst
nometer TiO
2
photocatalyst is generally used in sharp titanium-type
2
. It not only has good antibacterial effect, but also can purify the air and degrade organic matter. The principle is: sharp titanium TiO
2
is a semiconductor material, its band width of 3.2eV, only more than 3.2eV photons, that is, wavelength less than 388nm ultraviolet light, in order to excite electrons in the price band to the guide belt, thus forming a negatively charged highly active electron in the ribbon, in the price band to produce positively charged holes. Highly active electrons oxidize OH
-
and H
2
O molecules attached to the surface of TiO
2
into hydroxyl-owned HO, while O
2
adsorbed or dissolved on the surface of TiO
2
is easily captured by positively charged cavities to form O
2 . Ho and O
2
-
both have oxidizing energy above 500KJ/mol, which is why nanoTiO
2
photocatalysts have good antibacterial, purifying air and degrading organic matter.
the use of nanoTiO
2
in coatings there are still some problems to be solved.
(1). HO and O
2
-
also degrade coating parts, including resins and pigments, while antibacterial, air purifying and degrading harmful organic matter, which involves the selection of resins and how to solve color matching problems.
(2). The performance of antibacterial, air purified and degraded organic matter is greatly affected by the fact that there is little ultraviolet light on cloudy, rainy, indoor and evening days. By doping, the excitation energy is now reduced so that it can be used in visible light.
(3). NanoTiO
2
and remains stable.2.6.2 negative ion coating additives
It is reported that the main component of negative ion coating additives is negative ions, the additives added to the coating, the coating can continue to release negative ions, thereby improving air quality. Beijing Lanno Environmental Technology Co., Ltd. and other such products.
2.6.3 water-based dryers
With the development of water-based coatings, the research and development and application of water-based drying agents are also progressing steadily.. 3. Impact events in the field of coating additives 3.1 "Coating Additives--- Variety and Performance Manual" (second edition) Was held in Shanghai in 2004
"Coating Additives--- Variety and Performance Manual" was published in 1990, has been well received by readers. In order to supplement the development of additives over the past decade, the Preparation Conference of the --- Variety and Performance Manual of Coating Additives --- (Second Edition) was held in Shanghai from 2 to 3 June 2004. The meeting was attended by Gu Nanjun of the Chemical Industry Press, editor-in-chief Lin Xuanyi and members of the writing group Ding Yingsheng, Wu Xiaotian, Wu Yongming, Lu Jincheng, Liu Hongzhang, Lin Tao, Zhang Xianliang, Zhou Lixin, Yang Qiyue, Yu Lanping, Gui Taijiang, Zhao Feng, Yu Ning, etc. During the meeting, in order to make the book better reflect the 21st century at home and abroad coating additives development level of a heated discussion, and the implementation of the division of labor preparation work.
book is expected to be published in the first half of 2006.3.2 Handbook of Domestic and Foreign Paint Additive Varieties (Second Edition) Published
Handbook of Domestic and Foreign Paint Additive Varieties (Second Edition) prepared by Guo Shujing Zhang Xiumei was published in April 2005. The manual collects more than 3000 products from 172 manufacturers at home and abroad for readers to choose from.3.3 Qilu Isman Textanol Production Company
According to HC.com, Qiru Eastman Fine Chemical Co., Ltd. completed installation and commissioning in September 2004 and put into production in the fourth quarter of 2004. The company's products are Textanol film-forming additives and TXIB plasticizers. Eastman Textanol film additives, which are now available domesticly, are produced by the company.
Isman Fine Chemical Co., Ltd. is a joint venture between Sinopec Qilu Petrochemical Co., Ltd. and Eastman Chemical Co., Ltd., which is located in Zibo City, Shandong Province. 3.4 Corning began producing defoulants in China
S., Cognis Grease Chemicals Co., Ltd., and in October 2004 began production of defoulants, currently producing only Foamaster series defoulant products. These products are mainly used in emulsions, water-based coatings and adhesives and other fields. According to reports, Corning's despotic agent technology from Henkel and Diamond Shamrock Chemical Company (formerly Nopco). 3.5 BYK Chemie's development in China
Since 1998, BYK Chemical has opened three offices in China, namely, Beijing, Shanghai and Guangzhou. In December 2001, BIK Chemical's first production company in China was established in Copper Tombs, Anhui Province, and was completed and put into operation in 2003. Immediately after the establishment in Guangdong Bike Chemical Copper Tomb Co. , Ltd. Guangzhou Branch and technical service center. In 2004, it also set up the Shanghai branch of BIK Chemical Copper Tomb Co., Ltd. and the Shanghai Technical Service Center. A technical service center will also be established in Tianjin in 2005. Some of Bick's additives are now produced by Bick Chemical Copper Tomb Co., Ltd.
3.5 German Degussa, Tego Shanghai plant completed and put into operation
At present, only solvent-based additives will be produced, and later will also produce water-based additives. 3.6 Ciba Acquisitions (EFKA)
The consolidation of the business has been under way since 2001 when Ciba acquired EFKA. .