ARJUN CHEMICALS PVT. LTD.
   
   
   
Coating Chemicals

 

Pigment

Products ;

       Hydrocarb 90-OG : Natural, ultrafine calcium carbonate powder, manufactured from a high purity,white limestone

Applications-

    • Pigment improves paper smoothness, brightness ,opacity and ink absorption.
    • It is used as Pigment in the Coating application and as filler in the wet end application.
    • Carbonate may be PCC or GCC.
    • PCC used for wet end application due to its less abbrassive particles,high bulky and high brightness characteristics.
    • GCC is widely used in the coating application because of its lower cost and low viscosity(better rheology) characteristics.
    • The particle size  decides the suitability of the product for pre-coating or top-coating application.
    • The Calcium carbonate in the powder form need to be re-dispersed with the help of dispersing agent.
Binder

Applications-

  • Binder modifies the properties of coating color  ( e g rheology, water retention) or coating
  • Binder are either modified natural products ( I e starch or protein based) or synthetic polymers. They form a film, whose properties combine with those of the pigment to give the desired coated paper properties.
Co-Binder

Applications-

    • Is a secondary binder used along with primary binder to improve the rheological properties of the coating color.    
    • Used as a Binder in the formulation.
    • Develops higher water retention to the coating color.
    • Improves the surface strength of the coated paper.
    • Reduction in coating slip cost.
    • Improvement in the stiffness of the coated paper/paper board.
    • Potato starch is preferred due its clear,stable and high binding power characteristic.
    • Better ink adsorbency(receptivity).
    • Compatible with all kinds of  Latex.
    • Better rheology,less mottling, low odour and taste,less yellowing and stable viscosity.
Insolubilizer

Applications

  • Improves the water resistance and wet rub resistance of the adhesive for offset grades and when printing by water based inks.
Lubricant

Products:

LB-50 is a dispersed calcium stearate lubricant.It is well known for its effectiveness in both starch and casein coatings.

 

Application

    • These are used to improve the coater runnablility, give release properties to the sheet, reduce dusting, reduce picking and improve gloss. As a part of their function, they may alter the rheological properties of the coating mixture to match the coating process requirement.
    • Lubricants are used in the coating formulation for developing the lubricating effect between the coating color,applicating unit and the paper.
    • Normally,these are Calcium sterate based product.
    • The lubricants also improves the smoothness of the coating surface and so also controls the dusting.
    • Lubricants will improve the life of the applicator blade/rod and there by reduces the problem of streaking at the time of coating application.
    • To develop in-solublising character to the binder by developing hydrophobicity.
    • The cross-linking of the –OH and –COOH groups of the binders.
    • Improves the curing rate of the coating and gives the Wet rub resistance to the coated surface of the paper/paperboard.
    • IGT of the coated paper is improved.
    • Dusting and miss-registration problem during the printing process is minimised to a greater extent.
Dispersant

Products:

HOSPERSE-PA40 is an organic dispersant specially developed as viscosity reducing stabilizer for water borne paint and various pigment slurries used in the preparation of aqueous dispersions.

 

Application

    • Used to prevent pigment agglomeration in coating colour.
    • They are used to disperse the pigments like Cal.carbonate,Clay,Titanium di-oxide,etc.
    • They are Polyacrylates.
    • They are anionic in nature and develops a repulsive force between the pigment particles there by avoiding settling or re-agglomeration.
    • The stability of the pigment slurry is mainly dependent on the performance of the dispersant.
    • The dispersant helps in maintaining the stable rheological properties  of the pigment slurry.

 

 

 

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