Studies On NR Modified By PMMA/SiO₂ Hybrid Material Emulsion

The Quadratic general rotary unitized design was used in this study. 4 key factors that could affect the performance of NR: the pH value of sodium silicate when hydrolisising(X1), the time token by hydrolisising(X2), the dosage of acrylic acid(X3), the dosage of the activated-silicon-alcohol intermediate that added(X4) was studied. The results shows that the tensile strength of the NRL film modified by PMMA/SiO2 Hybrid Material achieved 29.80MPa when the pH value of acrylic acid was 4, the time token by hydrolisising was 130min, the dosage of acrylic acid was 3.5ml and the dosage of the activated-silicon-alcohol intermediate that added was 9 ml. And the tensile strength of the NR film modified by PMMA/SiO2 hybrid material achieved 26.61MPa when the pH value was 4, the dosage of acrylic acid the time token by hydrolisising was 110min, the value of acrylic acid was 3.5ml and the value of the activated-silicon-alcohol intermediate that added was 9 ml. PMMA/SiO2 hybrid material was studied through FT-IR and grain diameter analyser, the result shows that PMMA/SiO2 Hybrid Material prepared could satisfy the standards of hybrid materials. The mechanical properties, aging properties and colloid properties of NRL added with different dosage of PMMA/SiO2 hybrid material was studied, the results show that the tensile strength of NRL film achieved 27.93 MPa when the hybrid material dosage was 2.5mL/100g, the colloid properties changed regularly with the dosage of the hybrid material raised and the aging properties of the NRL film was improved. The study on the storing colloid properties shows that the viscosity and the heat stability raised first and then decreased slowly with the dosage of the hybrid material raised, and the mechanical stability was higher than 1200s. The mechanical properties, aging properties, and vulcanizing receipt of NR modified by different dosage of PMMA/SiO2 hybrid material was studied, the results show that the tensile strength achieved 27.65 MPa when the dosage was 5g/100g, the aging properties was also improved, and the tensile strength of NR modified by hybrid material achieved 32.48 MPa when the vulcanizing receipt was NR: 100, S: 2.3, stearic acid:1.0, ZnO:3.0 and CZ:1.0. The heating properties of NR and NRL films were studied through TG-DTG and DMA.