| Waterborne polyurethane is dispersed in water,its characteristics include innocuity, no flammability,no pollution,safety,high rigidity,better adhesion ect,which answer for need of coating development.In this paper, Waterborne polyurethane according with the require of printing ink and metal anticorrosive coating were researched,and organosiloxane modified polyurethane were studied.lt may be summarized as follows:1. In printing ink of our country, adhension of waterborne printing ink synthesized by using crylic acid in plastic is not good .The waterborne printing ink only adapt to paper brand and paper box packing.Studys on overcoming the defects of waterborne printing ink are a fat lot.To fitting the need of plastic print. The material of polyester,dimethylol propionic acid,isophorone diiocyanate were used to be synthesized anion acyclic waterborne polyurethane dispersion.Through changing the mole ratio of NCO to OH , mass content of DMPA, the effection of viscidity ,rigitidy, apparent etc were analysed to adjust the craftwork. Therefore,better property is the mole ratio of NCO to OH is 1.8 , mole ratio of PBA to glycerol is 0.67 to 1, DMPA mass content is 4% and chain extender was choosed EDA and chain extender mass content is 0.8% , the resin property of adhesion , transparence, viscidity etc were improved, the synthetical resin with accords with the require of printing ink basically.2. waterborne coating has been applied in metal anticorrosive field.To improve the property of waterborne anticorrosive coating, waterborne polyurethane has been used as anticorrosive coating. The pigment/binder ratio (P/B) of coating is the important parameter of effecting the coating performance, which impact the penetrability protection to the electrolyte. Now, the studys on P/B are less.In order to compose better property coating, a waterborne anticorrosive coating has been synthesized by using waterborne polyurethane, pigment and stuffing.The pigment/binder ratio of coating was changed. Samples were exposured to 3% NaCl solution for 30 days.The corrosion resistance properties of polyurethane paints was investigated by corrosion potential measurements and electrochemical impedance spectroscopy (EIS). Therefore, better anticorrosive protection is achieved by the coatings pigmented with P/B = 0.8 and 1.5. Although collectivity performance of P/B=0.8 are good, solidify time is long and resin is neededmore for increasing the cost.The impact resistance of P/B=1.5 is relative bad.but the other performances of it are well and cost is low.3. Due to the structure of synthetical waterbome polyurethane is linearity, the water resistance and heat resistance should be improved. Organosiloxane has better characteristic of weather resistance and water resistance. Organosiloxane modified polyurethane can make up the defects of each other and exert each virtues. The modified resins had been synthesized via inducting polydimethylsiloxane with IPDI and extending in emulsification using silane coupler.Change the mass content of PDMS, better property sample was choosed. Extending in emulsification using difference silane couplers, the best one was choosed. The two samples were compared with waterbrone polyurethane. The properties of the polyurethane were investigated using infrared spectroscopy (IR), DSC, TGA, tensile measurements, water contact angle and showed that thermal stability, the water resistance and solid content of the PU were improved. The aim was achieved. |
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