What is UV curing system ?

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What is UV curing system ?

• SOLTECH LTD.

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Advantages

• Energy saving
• No volatile solvent
• Very short cure time
• No heat
• One pack system
• Space saving

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UV(200400nm) curing
UV

• Photo-initiator P. (free radicals)
• Free radical monomer oligomer
• Cross linked polymer network

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Oligomer

• Epoxy acrylate
• Urethane acrylate
• Polyester acrylate
• Acrylic acrylate
• Amino acrylate

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Epoxy acrylate (1)
Chemical resistance , fast cure and hardness

• Paper coating
• Overprint varnish
• Wood coating
• Ink application (screen , offset)
• Solder resist ink

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Epoxy acrylate (2)

• BPA epoxy acrylate (Solmer E 120,145,146,1686)
• Paper and wood
  coating
• Acrylate of epoxydized oil (Solmer E 186)
• ink application
• Modified epoxy acrylate (Solmer E
  1701,1702,1703..)
• screen ink ,
  paper and wood
• Novolac epoxy acrylate (Solmer E
  1626,1636,1656..)
• solder resist ,
  hard coating
• Acid modified Epoxy Acrylate (Solmer E 1695)
• PSR , metal
  coating

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Urethane Acrylate (1)

• Toughness , flexibility , adhesion and
  non-yellowing
• Plastic and film coating
• Floor tile coating
• Screen ink
• PVC floor and wood coating
• Adhesive
• Anti-fog coating

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Urethane Acrylate (2)

• Polyester type (Solmer U 584, 594, 580)
• adhesion , toughness
• Polyether type (Solmer U 530, 564)
• flexibility , fast cure
• Others (Solmer U 522, 522B, 520, 5260)
• fast cure , hardness

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Polyester Acrylate

• Adhesion , pigment-wetting , low viscosity
• Offset and screen ink
• Solmer P 236
• Etching resist
• Solmer P 270,271,272
• Paper and Wood coating
• Solmer P 280,281
• Flexo ink
• Solmer P 280,281
• Laminating adhesive
• Solmer P 220

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Acrylic acrylate

• Adhesion , solvent resist , non-yellowing
• Plastic coating
• Overprint varnish
• Adhesive
• Solmer A 345,364,3710

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Amino acrylate

• Improve UV cure response
• Paper and Wood coating
• Screen ink
• Solmer Z 115, 225

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Additive

• Silicone Acrylate (Solmer Z 9135, 9136)
• slip and substrate wetting
• Adhesion promoter (Solmer Z 9166, 9167)
• PCB ink , metal and plastic
  coating
• Non-silicone leveling agent (Solmer Z 9070)
• screen ink

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Monomer (1)

• How to select monomer?
• Viscosity and Solubility
• Volatility
• Odor and toxic property
• Reactivity and functionality
• Percent of shrinkage

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Monomer (2)

• Mono NVP, Styrene, IBXA, PEA
• Di TPGDA, HDDA, TTEGDA
• Tri TMPTA, PETA
• Others PE4A, DPHA

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Monomer (3)

• A viscosity, reactivity, hardness, gloss,
  chemical resistance
• B flexibility, solvency, adhesion

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Strategy for formulation

• 1. Select Oligomer(s) for basic film forming
  properties
• 2. Use Monomer for viscosity control
• 3. additives for performance fine tuning
• 4. photo-initiator package is critical

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General principles

• 1.Each component plays a key role in total
  performance
• Formulate for total performance
• Optimize on performance requirements
• Viscosity control, simple dilution no!

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General principles

• 2. formulations are sensitive to curing process
  parameters and equipment
• Use controls in experimental design to see
  effects of external factors

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General principles

• 3. cost/performance is the key
• Raw material costs
• Volume dependency
• Energy costs
• Labor costs
• Competitive pricing

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Oligomers

• Basic film forming properties
• Hardness abrasion
  resistance
• Chemical resistance scratch resistance
• Flexibility adhesion
• Toughness weatherability

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Oligomers

• Other considerations
• Cure speed stability
• Cost toxicity
• Special properties availability

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Monomers

• Viscosity reduction
• Flexibility (monofunctional)
• Crosslinking (multifunctional)
• May also increase speed

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Additves

• Wetting pigment
• Flow filler
• Slip temperature
• resistance
• adhesion

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Photo-initiator

• Cost type of system
• Pigment/color processing variables
• Film thickness

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Application

• Wood , paper board coating
• Plastic (PVC floor, ABS, PC,PP)
• Adhesive (laminating, PSA)
• Ink (screen, wet dry offset, flexo)