润滑科技信息平台

专利摘要

[0102] 用于评价新的或用过的润滑组合物、尤其是用于内燃机的组合物和用于润滑组合物的添加剂的分散能力的程序; [0071] 其中该方法包括以下步骤:-提供至少一种碳颗粒在待测试组合物中的均匀分散体,该组合物由润滑组合物或其级分或组分组成,其中该方法的特征在于进一步包括以下步骤: -获得施加到观察表面上的上述均匀分散体的至少一个显微图像样本; -计算所获得的图像的空隙度作为表示组合物中颗粒分散程度的参数。该专利申请包含另外11项专利权利要求。。 ......

基本信息

专利类型:
发明专利
申请/专利号:
RS20240836
申请日期:
2021-04-07
专利申请人:
分类号:
["G01N33/28","G01N15/00","G01N35/10"]
发明/设计人:
NOTARI, MARCELLO ， RAUSA, RICCARDO ， ASSANELLI, GIULIO ， FERRARO, GIOVANNI ， FRATINI, EMILIANO ， BAGLIONI, PIERO
权利要求: 1. Method for the assessment of the dispersing capacity of new or used lubricating compositions, in particular compositions for internal combustion engines, and of additives for lubricating compositions; the method comprising the steps of: - providing a homogeneous dispersion of at least one carbonaceous particulate in a composition to be tested, consisting of a lubricating composition or a fraction or component thereof; the method being characterised by further comprising the steps of: - acquiring at least one micrographic image of a sample of said homogeneous dispersion, deposited on an observation support; - calculating the lacunarity of the acquired image as a parameter representative of the degree of dispersion of the particulate in the composition.2. Method according to claim 1, wherein the step of providing the homogeneous dispersion comprises the steps of: - preparing a mixture comprising a predetermined amount of carbonaceous particulate and a first amount of lubricating composition or a fraction or component thereof; - homogenizing the mixture until a homogeneous paste is obtained; - adding a second amount of lubricating composition to the paste so as to obtain a preliminary dispersion; - homogenizing the preliminary dispersion; - equilibrating the preliminary dispersion under mild stirring conditions and forming said homogeneous dispersion.3. Method according to claim 2, wherein the mixture is mixed at room temperature with a mixer operating at a speed between 1000 rpm and 1500 rpm, for a time between 2 minutes and 5 minutes.4. Method according to claim 2 or 3, wherein each step of homogenization, of the homogeneous paste and of the preliminary dispersion respectively, is carried out by means of a homogenizer operating at a speed between 18000 rpm and 24000 rpm, preferably between 20000 rpm and 21000 rpm, for a time exceeding 10 minutes, preferably between 10 and 15 minutes, at a temperature between 60°C and 90°C, preferably between 70°C and 80°C.5. Method according to one of claims 2 to 4, wherein the step of equilibrating the preliminary dispersion is conducted by means of a thermo-agitator, in particular an orbital thermo-agitator, operating at a speed between 200 and 500 rpm and at a temperature between 70°C and 100°C, preferably between 80°C and 90°C, for a time exceeding 24 hours.6. Method according to one of the preceding claims, wherein the step of calculating the lacunarity comprises the steps of: - defining on the image a grid formed by a plurality of cells (boxes); - evaluating the pixel density in each cell of the grid according to grid size and grid orientation with respect to a fixed reference system; - calculating the lacunarity with formula (I): λ ε , g = σ μ ε , g 2 wherein: µ is the average of pixels per cell at each ε, ε is the scale applied to the image, g is the orientation of the grid with respect to the image, σ is the standard deviation; - calculating a final lacunarity (λ) as an average over all possible grid orientations (Ng), with formula (II): Λ = ∑ λ g N g 7. Method according to one of the preceding claims, wherein the amount of carbonaceous particulate in the mixture is between 5% and 15%, preferably between 7% and 12%, of the total weight of the mixture.8. Method according to one of the preceding claims, wherein the preliminary dispersion contains a concentration of carbonaceous particulate, expressed as a percentage by weight of the total weight of the dispersion, between 0.5% and 70, preferably between 1.5% and 5%.9. Method according to one of the preceding claims, wherein the carbonaceous particulate is a carbon black having a polydispersity, defined as the width at mid-height of the Gaussian particle size distribution curves, between about 10 nm and about 50 nm and preferably between about 20 nm and about 40 nm; and/or average particle sizes between about 10 nm and about 70 nm, preferably between about 20 nm and about 50 nm; and/or surface polarity, i.e. amount of oxygen, between about 1% and about 9% and preferably between about 2% and about 6%.10. Method according to one of the preceding claims, wherein the step of acquiring said image is carried out by means of an optical microscope equipped with an objective at least 10X, keeping the sample at a temperature of at least 80°C, preferably at least 90°C, more preferably at least 100°C.11. Method according to one of the preceding claims, wherein the sample is maintained during the step of acquiring the optical micrograph at a temperature between 90°C and 100°C, preferably at a temperature of about 100°C.12. Method according to one of the preceding claims, wherein the homogeneous dispersion sample is prepared by depositing a quantity between 2 and 6 pL, preferably between 3 and 5 µL, between two microscope slides.