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Styrene Butadiene Latex Siam Synthetic Latex Co., Ltd.

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Presentation on theme: "Styrene Butadiene Latex Siam Synthetic Latex Co., Ltd."— Presentation transcript:

1 Styrene Butadiene Latex Siam Synthetic Latex Co., Ltd.
Discussions: What is Latex? Latex Characterization SB Latex applications Health hazard and safe handling information Q&A

2 What is Latex? LATEX is a white, tacky, aqueous suspension of a hydrocarbon polymer occurring naturally in some species of trees....or made synthetically. made by emulsion polymerization techniques from a range of monomers (styrene, butadiene, acrylates, etc). low in viscosity, ~ 50% water / 50% polymer, and are easy to pour, mix and pump. stabilized by ionic forces of repulsion between the particles, and also by the addition of suitable surfactants. Latexes may be destabilized by the following: Ions (especially multivalent cations Ca2+, Al3+) Shear (mixing, pumping) Freeze / Thaw Heat

3 Advantages of Latex Low viscosity: It is an advantage to have the polymer in a liquid state for processing by the customer. Aqueous: Latex may be used directly in aqueous formulations. There is no organic solvent to remove (flammability, toxicity, environmental etc.) Unique manufacturing process: Fast reaction, good heat removal due to low viscosity. Polymer: A wide range of polymers are available using various combinations of monomers. eg. The dried polymer may be: A clear, tough, tough rubbery film, which may act as a binder in filled systems. A hard plastic (white powder). A sticky (tacky) adhesive.

4 S/B Latex Compositions
Function, Contribution Styrene Hardness, strength, stiffness, good aging, high Tg polymer Butadiene Softness, flexibility, adhesion, poor aging, low Tg polymer Water Continuous phase for emulsion polymerization Enhances heat removal from reaction Surfactant Improve stability of Latex Defoamer Control foaming tendency of latex under processing or end use conditions Antioxidant Increase usage lifetime of product by reducing rate of oxidation (butadiene polymers) pH control agent Control pH during polymerization Adjust pH after polymerization to provide stripper stability Adjust pH for customer specification Biocide Control bacteria in latex which feed on organics present

5 Typical SCG-Dow S/B Latex properties
Solids content % Specific gravity pH Viscosity mPa.s Surface tension dynes/cm Styrene content of polymer % Vinyl Acid content of polymer % Particle size m

6 Latex Characterization
Solid content The water and other volatile components are evaporated to determine the non-volatile (solid) content of the latex. This 'solids content' reflects the amount of 'active' polymer, additives etc. in the latex. Filter residue Latex residue is formed from the agglomeration of polymer particles. Latex is passed through a standard sieve, and the dried weight of latex residue per litre of latex is recorded. Fisheye test The fisheye test is used to measure the film forming properties of the latex for coating applications. Film continuity may be affected by waxes or silicon based defoaming materials. Particle size (Light scattering) The weighted average particle size is calculated from the measured dissymmetry of light scattering. The dissymmetry is the ratio of the intensity of light scattered at 45 degrees and 135 degrees. The particle size is expressed in angstroms.

7 Latex Characterization
Particle size (HDC) Hydrodynamic Chromatography (HDC) is a technique used for quantitative determination of particle size and particle size distribution in latex samples. The latex particles are separated via liquid chromatography according to their size. Latex film properties Allows certain predictions as to a latexes behavior and properties in end-use applications. Latex film properties include: Tensile strength, Elongation to break, Young's Modulus, Swell index, Gel content, MFFT, Tg, Composition by FTIR. MFFT Minimum film formation temperature Temperature at which a latex will form a continuous film. Estimation of the MFFT is critical to ensure that proper processing and drying conditions are chosen for developing a latex film during end-use (eg. during drying on a paper machine).

8 Latex Characterization
Tg Glass transition temperature The Tg is the temperature at which an amorphous (non-crystalline) material changes from a brittle, glassy material to a flexible, rubbery state, or vice versa. Some end-user important properties of polymers which correlate strongly with Tg: Tensile strength, % Elongation, Flexibility ("Hand"), MFFT VOCs Volatile organic compounds Measuring VOCs is important to ensure specifications are being met. Determine the level of odiforous components in the latex. Examples of VOCs that are often measured include: Styrene, 4-VCH, 4-PCH, Alkyl benzenes Bacteria What does bacteria do to our latex? Gives a foul odor. Causes deterioration of physical properties. Can cause residue (coagulation). Bacteria control: Clean storage tank, clean shipping container, fast turnover.

9 THE DRYING PROCESS ~ ~ ~ ~ ~ STAGE I Water evaporation: solids
%, particles get closer together and viscosity increases. Coalescence: solids %, particles forced together and coalesce. Film: interdiffusion, decrease in gas permeability. STAGE II STAGE III ~ ~ ~ ~ ~

10 S/B Latex applications
Paper coating Carpet backing Construction Can sealant Wood adhesive Etc.

11 Dow Latex is modified styrene butadiene latex made by emulsion polymerization for variety applications such as paper coating, carpet backing, wood adhesive, can sealant and construction application etc. Paper Coating: Used as a binder for pigmented coating of paper and paperboard for offset printing. High wet and dry binding power Good printability Stiffness Blister resistance Fold crack minimization Carpet backing: Used for carpet secondary backing applications, providing excellent adhesion when either wet or dry. High tuft bind Excellent filler acceptance Excellent mechanical stability Low odor/Low VOCs Contain antioxidant

12 Cement & Construction:
specifically designed for use in cement mortars. Improve bonding, tensile and flexural strength Durability Improved water resistance High chloride resistance Can sealant: Used for can sealant and can seaming compound. For food and beverage can packaging. Excellent wet and dry adhesion Comply with F&DA

13 Paper Coating

14 Why is paper coated? To improve the optical properties (gloss, brightness, opacity) To increase the smoothness of the surface To improve the printability To bind the pigment particles to each other and to paper we say that the binder “spot-welds” the pigment particles

15 Coated paper prints better
Printed Uncoated Paper Printed Coated Paper

16 Paper Coating Compositions
Function, Contribution Pigments: Calcium Carbonate & Clay Fill voids and contour on the paper, make paper surface smoother, more even ink absorption Binder (Latex / Starch) Bind pigment with the paper Dispersant Continuous phase for emulsion polymerization Enhances heat removal from reaction Insolubilizer Improves water resistance of the coating (wet pick) for offset printing. Lubricant Improves runnability, reduces dusting on calender and slitters, sheeters in finishing. Dye adjust colour of the coated paper OBA Optical Brightening Agent Improves brightness of coated paper by adsorbing UV light and re-emitting it as blue light. Makes the paper look brighter and “whiter” NaOH Adjust pH of coating color to range 8-9

17 Typical Paper Coating Formulation
Formulation = Coating Color Ingredient Parts Calcium Carbonate 0 – 100 Kaolin Clay Plastic Pigments Total Pigments 100 Latex Binder Starch 4 Thickeners – 1.0 Lubricants (stearate) 0.5 – 1.0 OBA – 1.5 Defoamers – 0.3 Cross-linkers (UF) 0.2 – 0.5 pH 8 - 9 Solids % Viscosity mPas Coating normally produced in the mill in a batch process (kitchen) Paper can have 1, 2 or 3 layers of coating Dow supplies: Binder Hollow Plastic Pigment Solid Plastic Pigment

18 Carpet Backing

19 Carpet Segmentation BACKING TYPE Carpet Woven Tufted Needlefelt Tiles
Auto Mats Synthetic Grass Bathroom Mats Underlay unitary SB/EVA/PVAC Full Bath SB One Side TML/SB Rubber Crumb / PU Foam PU/rubber/SB SB/PVC/PU Natural/Synthetic Latex PVC/Bitumen unitary SB secondary backing SB Foam HSL BACKING TYPE Ecoworx Gel No Gel Bathroom mats

20 TUFTED CARPET CONSTRUCTION Yarn Primary backing Latex compound
Secondary backing

21 Tufted carpet latex compound
Objectives: Good frothability and froth stability (coat weight control) Good tuft lock (prevent tufts pulling out) Penetrate the yarn tufts to bind the individual filaments (prevent ‘pilling’ and ‘fuzzing’) Good secondary backing adhesion Prevent edge fraying when the carpet is cut for installation Good dimensional stability Add weight Required stiffness (‘hand’) By addition of other additives, contribute to ignition resistance and conductivity

22 Carpet latex compound compositions
Function, Contribution Binder (S/B Latex) Bind yarns with backing, Handed feeling Filler (CaCO3) Give bulk to the latex compound and reduce cost Dispersing agent Offsets the forces of attraction between pigment particles. Reduction of energy necessary to separate pigments into discrete particles Foaming agent Froth the compound Foam stabilizer prevents the foam collapsing while in the foam bank adjust colour of the coated paper Thickener Increase the viscosity of a latex compound to prevent the filler settling. Prevents the compound from penetrating through to the face or back of the carpet.

23 Tufted carpet compound formulation
DIRECT COAT (D/C)

24 TUFTED CARPET LICK APPLICATOR

25 Construction

26 Application of LMC Deck coverings Anticorrosive Linings Flooring Paving -Bridge deck overlay -Internal and external ship-decks -Footbridge decks -Rail wagons -Chemical or machinery plant floors -Septic tanks -Parking structures -Effluent drains -Commercial and Industrial floors -Toilet floors, garage -Railway platform, Road

27 Application of LMC Integral Waterproofing Repairing materials Decorative coatings -Concrete roof-decks, render wall -Water tanks, Swimming pools -Septic tanks, Silos -Cement stucco-like coatings -Cement filling compound -Self leveling cements -Sprayed concrete for repair of concrete structures -Protective coatings for corroded reinforcing bars

28 LMC Mix Design: 3-6 cm thick
(Parts by weight) Component Conventional concrete LMC Cement Sand, 2NS (<0.5 cm) Stone, 25N (<1.2 cm) Latex/Cement Water/Cement Water reducer * none Air entr. agent * none Air content 5-8% 3-7% * vary levels

29 Typical Formulation of LMC
Portland cement Aggregate (0-12 mm) DL470 (46% solid) Potable water P/C (polymer/cement) W/C (water/cement) M3 400 kg 1650 kg 130 kg 62 kg = 0.15 = 0.33

30 LMC Model Initial Mixing Latex deposit on cement & aggregate
Unhydrated Cement Latex Aggregates Air

31 LMC Model 3. Latex close packs around cement and aggregates,
cement partially hydrated 4. Latex film encapsulates fully hydrated cement

32

33 Benefits of DL470 to concrete
Make concrete stronger and more durable Improve adhesion, flexural strength and tensile strength with no loss of compressive strength Impermeability Reduce penetration of moisture and corrosive chemicals Abrasion resistance High traffic area e.g. car park

34 Benefits of DL470 to concrete (cont’)
Thinner overlay Allow less material to be place to assure protection Freeze/Thaw stability Improve resistance to moisture penetration and cracking. Workability Reduce w/c ratio, leads to higher density structure

35 Affect of Bridge deck corrosion
Financial Costs Traffic Delays Lost Productivity Increased Emission Auto accident Personal Injury

36 Health hazard and safe handling information

37 Health hazard information
Inhalation No adverse effects are anticipated from inhalation. Ingestion Single dose oral toxicity is considered to be low. No hazards anticipated from swallowing small amounts incidental to normal handling operations. Skin Short single exposure is not likely to cause significant skin irritation. Prolonged or repeated exposure may cause skin irritation. Skin absorption is unlikely due to physical properties. Eye May cause slight transient (temporary) eye irritation. Corneal injury is unlikely.

38 First aid measures Inhalation No adverse effects anticipated by this route of exposure. Ingestion No adverse effects anticipated by this route of exposure incidental to proper industrial handling. Skin Wash off in flowing water or shower. Eye Irrigate immediately with water for at least 5 minutes. First Aid Facilities An eye wash fountain and a general washing facility should be available to the work area. Other Information Never give fluids or induce vomiting if patient is unconscious or is having convulsions.

39 Fire fighting measures
Extinguishing Media Water fog or fine spray. Carbon dioxide. Foam. Dry chemical. Unusual Fire & Explosion Hazards Will not burn until water is evaporated. Flammability Non-combustible, non-flammable while an emulsion. Dried product will burn in a similar fashion to wood. Hazardous Combustion Products Upon burning, the dry product generates dense, black smoke.

40 Spill & Disposal Protect people: Protect environment:
Wear adequate personal protective equipment. Protect environment: Keep out of sewers, storm drains, surface waters and soil. Clean-up: For small spills: contain and cover with sand, sawdust or absorbent material. Clean-up: For large spills: contain and recover for disposal. If entry to drains or sewers has occurred, system may plug. Flush system with large amounts of water.

41 Q&A Thank you


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