Status and development trends of additives for water-based coatings (4)

is an active film-forming additive. Acrylic di-cycloprene-based oxyethyl esters (
DPOA
) are unsaturated polymeric organic matter, with an average polymer
Tg- 33 degrees C
, odorless. The structure is as follows:in a latex paint formulation with a higher Tg value, no film additives are required, but DPOA is added and a small amount of cobalt salt is added. DPOA reduces the film-forming temperature so that latex paint is filmed at room temperature. However, DPOA is not volatile, not only environmentally friendly, but also oxidizing free-based polymerization under the action of the drying agent, increasing the hardness, viscosity and brightness of the coating film. Therefore, DPOA is called an active film-forming aid.
2.5 anti-corrosion anti-mold anti-algae agent
2.5.1 commonly used preservatives
there is now a wide variety of preservatives on the market. Analysis of its active ingredients can mainly be divided into the following categories: isoprene ketones, the release of formaldehyde, benzodiaxene, replacing aromatics, organic bromides, organic amines, triamcinolone and so on.
commonly used preservatives are:
1,2 benzodiazole-3-ketones (1,2-benzisothiazolin-3-one), or BIT for short, belonging to such preservatives as: Proxel GXL, Proxel XL-2, Troysan 586, Mergal K10-N, Acticide BW20, Biocide BIG-A 50M, sterilization preservative PT, sterilization preservative BTG, SD-202-1, SD-202-2, etc.
5-chlorine-2-methyl-4 isothiazolin-3-ketone/2-methyl-4 isoprene-3-ketone, English name 5-chloro-2methyl-4-isothiazolin-3-one/y 2 methyl-4-isothiazolin-3-one, or CMIT/MIT, is a cost-effective commonly used in-tank preservative that belongs to such preservatives as: Kathon LXE, Acticide MV, Biocide K 10 SG, Acticide F, Bactrachem W15, Bactrachem TS 15, Huaco-88, SD-818-1, SD-818-2, etc.
release formaldehyde-type preservatives, which are known to be a preservative. In fact, Formarin is 35%-40% formaldehyde aqueous solution. Due to the relatively strict requirements of free formaldehyde content in my domestic wall coating, the release of formaldehyde preservatives (formaldehyde release, or FR) is less used in the inner wall. Those belonging to the release of formaldehyde-type preservatives such as: N-shrink formaldehyde (N-formal), O-shrink formaldehyde (O-formaldehyde), O-shrink formaldehyde release formaldehyde faster than N-shrink formaldehyde. Also available are Troysan 174, Troysan 186, Nuosept 95, Ecocide BA, etc.
5-chlorine-2-methyl-4 isopyroid-3-ketone/2-methyl-4 isopyroid-3-ketone-release formaldehyde-type preservatives. In the coating industry, different anti-corrosion components can be combined and combined in different proportions, so that the advantages complement each other, to achieve the expansion of antibacterial spectrum, reduce dosage, reduce costs and improve environmental friendliness and other ideal results, called synergies. 5-chlorine-2-methyl-4 isopyroid-3-ketone/2-methyl-4 isopyroid-3-ketone-release formaldehyde-type preservatives, referred to as CMIT/MIT-FR, is a very common combination of complex methods, there is synergy. It has both the upper space protection of the container and the high-efficiency broad-spectrum sterilization. And the release of formaldehyde preservatives improves the stability of CMIT. Of course, formaldehyde content can not exceed the standard. But not all complexes have synergies. Such preservatives as: Acticide HF, Parmetol A26, Rocima GT, Rocima 623, Bactrachem IC, Bactrachem IC/2, Bactrachem WS22, Bactrachem WS44, etc.
1,2 benzodiaxyl-3-ketones/2-methyl-4 isoprene-3-ketones, English name 1,2-benzisothiazolin-3-one/2 methyl-4-isothiazolin-3-one, for short BIT/MIT, is an old active component, a new compound combination of in-tank preservatives developed after environmental restrictions on the preservatives in the tank of 1,2 benzodialyc-3-ketones/2-methyl-4 isoprene-3-ketones (CMIT/MIT). Its structure is as follows:BIT/MIT advantages are that the antibacterial spectrum is wider than BIT, also does not release formaldehyde, does not contain halogens, does not volatilized. The stability is good, the reducing agent is stable, and the PH value is not greater than 9.5. THE disadvantage of BIT/MIT is that sterilization is not as fast as CMIT/MIT, and sterilization speed is not as fast as CMIT/MIT. In use, because bit/MIT stability is good, thermal stability of about 80 degrees C, can be added at the beginning of pulping, in order to help with corrosion protection. The dosing is generally 0.2%-0.4%. Such preservatives as Actide MBS belong to this category.
other preservatives. e.g.:
1, 3, 5-3 (2-hydroxyethyl) - mean triglycerides (1,3,5-tris (2hydroxyethyl)-S-triazine, such as Gglokill 77 and Bactrachem TRZ.
hydrogen-1, 3,5-triethyl-S-triazine (hexahydro-1, 3,5, -triethyl-S-triazine), the product has Vancide TH.
1-(3-chloropropyl)-3,5,7-triazine-1-nitrogen kingpane chloride (chloroallyl-3,5,7-triaza-azonia-adamantane chloride), or CTAC for short, with Dowicil 75.
2,2-dibromo-3-(tricocial) nitrogen acrylamide (2,2-dibromo-3-nitrilopropionamide), or DBNPA, is a rapid fungicide, such as recycled wastewater sterilization for coating plants. The product is Dowicil QK-20, which is a 20% solution of DBNPA in water and polyethyl glycol.
Proxel TN is a compound preservative for BIT-FR.
preservatives, which can be combined with BIT-CMIT/MIT, complement each other with a balanced performance and environment-friendly trade-off, with products such as Bactrachem BFG, Bactrachem BFD and Ecocide KLD.
myacide AS (Tektamer) is an active ingredient of 2-bromine-2 nitro-1, 3-propane glycol (2-bromo-2-nitropropane-1, 3-diol) or Bromopol, which is both an efficient and safe preservative at a higher price. It was combined with CMIT/MIT, or with 1,2-bibromo-2, 4-butane, and good results were obtained. Products such as Bactrachem IB and Biocide PR8 are available at Bronopol and CMIT/MIT.2.5.2
. Commonly used anti-mold anti-algae agent
anti-mold anti-algae agent varieties are also many, according to the active ingredients, roughly: isoprene, benzodiamoles, iodine propylene, instead of aromatic hydrocarbons, dithione amino acid and so on.
commonly used anti-mold agents are:
benzodiazepthyl methylmate, whose English name is carbendazim, the name methyl-N-benzimidazol-2-yl-carbamate, alias polymycin, short-term BCM. Belongs to such mold inhibitors as Acticide SR1138, Rocima 320, Mycavoid CM, Preventol BCM, etc. Many domestic pesticide factories also have this product.
2-Zhengxinji-4 isoprene-3-ketone (2-octyl-4-isothiazolin-3-one) is referred to as OIT. Belongs to such mold inhibitors as, Skane M-8, Mycavoid FC, Acticide OTW, Huaco-108, YC-888, SD-888, etc.
3-iodine-2 propylene butyl acetate (3-iodopropargyl-N-butylcarbamate) is referred to as IPBC, is an environmentally friendly anti-mold agent, its structure is: . This is the only line mold inhibitor used in the coatings industry. Those belonging to this class of mold inhibitors such as Troysan Polyphase AF1, Troysan Polyphase AF3, Mycavoid M820, Mycavoid M830, Mycavoid M840, Omacide IPBC30, Omacide IPBC40, Omacide IPBC100, Preventol TPOC3081, Nipacide IPBC, Actic IP50. .