Formic Acid Liquid CAS 64-18-6

After soaking the raw skin in lime for hair removal and expansion, a large amount of calcium hydroxide lime paste is filled in the gaps between the skin fibers, which must be de ashed to open the collagen fiber structure. Dilute 90% liquid formic acid to a 5% -8% de ashing solution, slowly penetrate the interior of the skin, undergo acid-base neutralization reaction, and generate soluble calcium formate that is washed away with water. Inorganic strong acids can easily cause skin burns, excessive hydrolysis of collagen, and thinning and loosening of the skin plate; 

After ash removal, the bare skin enters the soaking tank, and formic acid is combined with salt to adjust the pH of the system to 2.8-3.2. Salt inhibits the water absorption and expansion of skin fibers, while formic acid opens collagen peptide bonds, creating conditions for uniform adsorption of chrome tanning agents and vegetable tanning agents. Adequate immersion in acid can significantly reduce chromium salt consumption by 15% -20%, reduce residual pollution of hexavalent chromium, and adapt to the EU REACH ecological leather standard;

After tanning, residual acidic tanning agents remain inside the skin. Dilute the sodium formate buffer system to neutralize the acidity inside the skin, balance the overall pH to 4.5-5.0, and prevent mold growth during storage; Leather dyes are mostly acidic dyes, and the dyeing bath relies on formic acid to maintain a stable acidic environment. The dye is firmly bound to the collagen amino group, and the color fastness is improved by 2-3 levels. It is resistant to friction and washing without fading; 

The raw fabric weaving slurry is mostly starch and PVA alkaline slurry, and the residual alkali must be neutralized and removed after alkaline boiling. Neutralizing and boiling residual alkali with liquid formic acid quickly lowers the pH of the fabric to a neutral acidic state, removing impurities such as cottonseed hulls, wax, and pectin; Wool and silk protein fibers should not be degreased with strong acid or formic acid, which can dissolve the surface oil, scales, and impurities of wool without damaging the protein peptide chain. The fabric should be fluffy and soft, and the silk fabric should have a shiny and transparent luster without yellowing or brittleness. 

After dyeing with reactive dyes, formic acid weakly fixes and blocks unreacted reactive groups, improving wet friction fastness; In the non ironing and wrinkle resistant resin finishing of cotton fabrics, formic acid acts as a resin crosslinking catalyst to accelerate the condensation crosslinking of hydroxymethyl resin and cellulose hydroxyl groups, and low-temperature curing reduces yellowing of high-temperature fabrics; Wool anti insect finishing and silk antibacterial finishing solution pH regulator ensure stable and long-lasting activity of antibacterial and anti insect additives.

When silage corn stover, alfalfa, ryegrass, and beet residue, fresh forage comes with miscellaneous bacteria, molds, and Clostridium. Natural fermentation is prone to spoilage, heat generation, protein degradation, and the production of butyric acid toxins. Spray 0.5% -1.5% weight ratio liquid formic acid on the harvested grass to quickly reduce the pH of silage to below 4.0, effectively inhibit the proliferation of spoilage microorganisms, and promote the benign fermentation of lactic acid bacteria in a targeted manner; 

Spraying low concentration formic acid on fish and shrimp puffed pellet feed to inhibit mold growth and oil rancidity in feed storage; Regularly sprinkle a small amount of formic acid on the aquaculture pond to regulate the acidity and alkalinity of the water, decompose the residual feed, feces, ammonia nitrogen, and nitrite at the bottom of the pond, and improve the problem of black hair and odor on the bottom; Low salinity aquaculture specific acid-base buffering agents for South American white shrimp and salmon stabilize water pH fluctuations and reduce stress induced mortality.