The test result shows that Mohs' hardness of ma -trix phase of mineral polymer material is3.40～3.50,acid resistance is92.1%～93.1%and alkali resistance is99.9%.
The test results show that the prepared glass-ceramics consist of matrix glass and wollastonite crystals and it has a compressive strength of 827 MPa, a mohs hardness of 6 degree, a volume density of 2.69 g/cm3, a water absorption of 0.016%, a acid resistance of 0.08%, a alkali resistance of 0.05%.
This paper studied the water resistance and acid resistance property of Y 2O 3 and Gd 2O 3 contaning La 2O 3 B 2O 3 BaO glass, Results indicated that the poor chemical durability of La 2O 3 B 2O 3 BaO glass can be improved by replacing La 2O 3 by Y 2O 3 and Gd 2O 3.
2. The single-factor experiment indicated that the pectinase dealed with 0.03mol/L CaCL2 had increased its acid resistance remarkably and the pectinase multiplexed with 0.025%GM+0.025%MXL had well enzymolysis effect.
The rusults show that synthetic emulsion adhesive has good application characteristic such as thickening properties, adhesivity, the feature of non-adhesive net, acid resistance, thermostability, bubble breaking and no bubble gathering et al when monomers are St, MMA,BA, BMA and AA, the content of St,BA,AA, are respectively about 63% 17% or 18%and 6%, seeded emulsion polymerization two-step additioo method is adopted.
Two strains of lactobacillus acidophilus,D1-3 and D4-3,were selected according to their biological characteristic tests such as their tolerance to bile salts and growth performance,and their acid tolerance,adhesive ability and bacteriostasi were further tested.
SiO_2 nanoparticle has many good properties of strong hardness, abrasive resistance, corrosion resistance and acid fastness. The combination of Sio_2 nanoparticle with acrylic resin to prepare inorganic nanomaterial/polymer composite has been proved to be an effective way to improve the mechanical property of coating film.
Iron oxide red is an excellent pigment, which has fine qualities such as covering power, coloring power, heat resistance, resistance to solvent, acid fastness, innocuity and anti-rust.
But after the reaction with phosphoric acid or ammonium molybdophophate, the acid fastness and exchange capacity for Cs+ in strong acid condition are greatly improved.
However, the SiO_2-PTW composite particles might still keep their fibrous shapes in boiling concentrated sulfuric acid. Thus the acid fastness of PTW coated with SiO_2 was improved because of the protection of SiO_2 shell.
The results indicated that the distribution of the group —CH_2COO~-at C_2,C_3 and C_6 within the anhydroglucose unit(AGU) of the new product PAC produced in the mixed solvent of high scale concentration,being more homogenous than the product produced through ordinary procedures. The properties of salt resistance,acid fastness and compatibleness were better.
The results showed that the pigment is most stable under pH2.98～ 3.46,its acid endurance is more strong,and the stability as well as anti－ oxidizing is more weak.
Enhanced heat stability, acid resistance, alkali resistance, and anti-trypsin stability of the modified enzyme were observed compared with those of the unmodified enzyme.
This paper reports on the study of acid tolerance of lactic acid bacteria as a property of cells, determining their ability to divide efficiently and retain viability under conditions of increased nutrient medium acidity during bacterial growth.
Bacteria of the strain STE05 lacked acid tolerance (at pH below 6.5, growth was retarded, and pH 5.0 was the lowest value at which the cells remained viable).
Acid tolerance is inherited in a stable manner and retained by the segregants of TV2 strain obtained in the course of long-term storage of the bacteria.
耐酸性
acid resistance
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