Surface non-polar modification method of sepiolite mineral powder and application of sepiolite mineral powder in plastic or rubber filler

文档序号：729578 发布日期：2021-04-20 浏览：18次中文

阅读说明：本技术 一种海泡石矿物粉体的表面非极性化改性方法及其在塑料或橡胶填料中的应用 (Surface non-polar modification method of sepiolite mineral powder and application of sepiolite mineral powder in plastic or rubber filler ) 是由欧阳东红谭建杰罗文君黄建武谢彦罗天添穆金龙戴维于 2020-12-15 设计创作，主要内容包括：本发明公开了一种海泡石矿物粉体的表面非极性化改性方法及其在塑料或橡胶填料中的应用。以棕榈酸为非极性化改性剂,以无水乙醇为溶剂,对海泡石矿物粉体进行湿法改性,通过海泡石矿物粉体的表面羟基与棕榈酸分子的羧基,在常温水介质中,借助催化剂六水合氯化铁发生异相酯化反应形成酯键,将棕榈酸链接枝在颗粒物表面,使其表面非极性化。本发明提供的非极性化改性配方成分简单、成本低廉且无毒副作用；所制得的表面非极性化海泡石矿物粉体性能稳定,改性效果明显,可大量用于塑料橡胶填料。(The invention discloses a surface non-polar modification method of sepiolite mineral powder and application thereof in plastic or rubber fillers. The method comprises the following steps of taking palmitic acid as a non-polar modifier and absolute ethyl alcohol as a solvent, carrying out wet modification on sepiolite mineral powder, carrying out heterogeneous esterification reaction on hydroxyl on the surface of the sepiolite mineral powder and carboxyl of palmitic acid molecules in a normal-temperature water medium by means of a catalyst ferric chloride hexahydrate to form ester bonds, and grafting palmitic acid chains on the surface of particles to enable the surface of the particles to be non-polar. The non-polar modified formula provided by the invention has the advantages of simple components, low cost and no toxic or side effect; the prepared sepiolite mineral powder with non-polarized surface has stable performance and obvious modification effect, and can be widely used for plastic rubber fillers.)

1. A method for modifying the surface of sepiolite mineral powder in a non-polar mode is characterized in that palmitic acid is used as a non-polar modifier, absolute ethyl alcohol is used as a solvent, the sepiolite mineral powder is modified in a wet mode, the hydroxyl on the surface of the sepiolite mineral powder and the carboxyl of palmitic acid molecules are subjected to heterogeneous esterification reaction in a normal-temperature water medium by means of a catalyst ferric chloride hexahydrate to form ester bonds, and the palmitic acid chains are grafted on the surface of particles to enable the surface of the particles to be non-polar.

2. The method for modifying the surface of sepiolite mineral powder according to claim 1, comprising the steps of:

(1) weighing palmitic acid, adding the palmitic acid into absolute ethyl alcohol for dissolving, and preparing a palmitic acid ethanol solution;

(2) weighing sepiolite mineral powder, adding water, and stirring uniformly on a magnetic stirrer to obtain a sepiolite mineral powder suspension;

(3) adding a catalyst ferric chloride hexahydrate into the sepiolite mineral powder suspension obtained in the step (2), stirring until the ferric chloride hexahydrate is dissolved, adding the palmitic acid ethanol solution obtained in the step (1), and reacting for 10-100 min at 30-60 ℃;

(4) and (4) filtering the reaction liquid prepared in the step (3), repeatedly washing the reaction liquid with water and ethanol for a plurality of times, and drying the reaction liquid to obtain the sepiolite mineral powder with non-polarized surface.

3. The method for modifying the surface of sepiolite mineral powder according to claim 2, wherein the ratio of sepiolite mineral powder: palmitic acid: anhydrous ethanol: ferric chloride hexahydrate: the weight ratio of water is 1: 0.0008 to 0.03: 3.8-4.2: 0.006850-0.027375: 7.0 to 8.0.

4. The method for modifying the surface of sepiolite mineral powder according to claim 2, wherein the ratio of sepiolite mineral powder: palmitic acid: anhydrous ethanol: ferric chloride hexahydrate: the weight ratio of water is 1: 0.0008-0.02: 3.945: 0.006850-0.027375: 7.5.

5. the method for modifying the surface of sepiolite mineral powder according to claim 2, wherein the reaction temperature in the step (3) is 30 to 45 ℃.

6. The method for modifying the surface of sepiolite mineral powder according to claim 2, wherein in the step (4), the drying temperature is 70 to 100 ℃ and the drying time is 6 to 12 hours.

7. Use of the sepiolite mineral powders with non-polar surfaces obtained by the process according to any one of claims 1 to 6 in rubber or plastic fillers.

Technical Field

The invention relates to a rubber and plastic filler, in particular to a surface non-polar modification method of sepiolite mineral powder and application thereof in plastic or rubber filler.

Background

According to the data published by the information network of the Chinese industry, the annual demand of rubber and plastics in the China market has been increased year by year from 2008, the annual demand is more than 7600 ten thousand tons (http:// www.cnii.com.cn /) to 2015, and a large amount of filler is needed in the production and manufacturing processes of the plastics and the rubber to improve the physical properties of the plastics and the rubber, and the filler plays a crucial role in reducing the cost. Therefore, the rubber and plastic filler has huge market capacity and wide industrial application prospect.

The natural mineral as the filler of rubber and plastic is a common method for reducing the production cost of products in industry, but the surface of the natural mineral is more polar, and the compatibility with the rubber and the plastic is relatively poor, thereby influencing the product performance. If the surface of the natural mineral is non-polarized, the compatibility with rubber and plastics is improved, and the product performance is further improved. In the last 90 th century, researchers found that the surface of materials rich in hydrocarbon functional groups exhibited non-polarity, which provided theoretical guidance for the preparation of surface non-polar materials. The particle size of the sepiolite mineral powder is 0.1-0.4 μm, the surface is rich in silicon hydroxyl, and the sepiolite mineral powder can react with organic molecules to carry out surface modification, thereby meeting the requirements of serving as rubber plastic filler. The modified sepiolite mineral powder is used as a filler of rubber and plastics to prepare rubber and plastic products, so that the cost of the rubber and plastic products can be reduced, and the mechanical and electrical properties of the rubber and plastic products can be improved. At present, most of the modification of the sepiolite mineral powder is carried out by using a silica coupling agent in a high-temperature environment, and the conditions are harsh, the cost is high, and the pollution is easily caused, so that the production, the use and the popularization of the modified sepiolite mineral powder are influenced.

Disclosure of Invention

In order to solve the technical problems, the invention provides a method for modifying the surface of sepiolite mineral powder in a non-polar way and application thereof in plastic or rubber packing.

In order to achieve the purpose, the technical scheme adopted by the invention is as follows:

a process for modifying the surface of sepiolite ore powder by non-polarity method includes such steps as wet modifying the sepiolite ore powder by using palmitic acid as non-polarity modifier and absolute alcohol as solvent, esterifying the hydroxyl on the surface of sepiolite ore powder and the carboxyl of palmitic acid molecule in normal-temp water medium by use of catalyst, and grafting palmitic acid chain onto the surface of particles to make its surface non-polar.

The surface non-polar modification method of the sepiolite mineral powder specifically comprises the following steps:

(1) weighing palmitic acid, adding the palmitic acid into absolute ethyl alcohol for dissolving (the micro-heating effect is better), and preparing a palmitic acid ethanol solution;

(2) weighing sepiolite mineral powder, adding water, and stirring uniformly on a magnetic stirrer to obtain a sepiolite mineral powder suspension;

Further, sepiolite mineral powder: palmitic acid: anhydrous ethanol: ferric chloride hexahydrate: the weight ratio of water is 1: 0.0008 to 0.03: 3.8-4.2: 0.006850-0.027375: 7.0-8.0, more preferably 1: 0.0008-0.02: 3.945: 0.006850-0.027375: 7.5.

further, in the step (3), the reaction temperature is preferably 30-45 ℃.

Further, in the step (4), the drying temperature is 70-100 ℃, and the drying time is 6-12 hours.

The activation degree of the nonpolar modification treatment on the surface of the sepiolite mineral powder is not less than 95%.

The sepiolite mineral powder with non-polar surface obtained by the preparation method is used as a filler for high polymer products, particularly for rubber and plastic products, is used for reducing the production cost of the rubber and plastic products and improving the mechanical properties of the rubber and plastic products.

The invention has the beneficial effects that:

1) the invention has low cost and simple preparation process, and can be prepared in large batch;

2) the invention does not relate to harmful pollution components, and the effluent (only containing modifier and a very small amount of catalyst aqueous solution) generated in the intermediate solid-liquid separation link can be used as the blending component of the powder slurry of the next batch, so that the powder slurry can be reused, and the problem of environmental pollution is avoided;

3) the invention abandons the modification method of high-price silane coupling agent, takes palmitic acid as non-polar modifier to graft fatty chains on the surface of particles through ester bonds, and has low reaction activation energy of hydrolysis-esterification reaction, low requirement on reaction conditions and easy control;

4) the rubber and plastic products with the non-polar sepiolite mineral powder on the surface as the filler have the advantages of remarkably improving the mechanical property and greatly reducing the production cost.

Drawings

FIG. 1 is a graph showing the affinity between sepiolite mineral powder obtained in example 8 of the present invention before and after modification and water.

FIG. 2 is an infrared spectrum of the sepiolite mineral powder obtained in example 8 of the present invention before and after modification.

FIG. 3 is a graph showing the static water contact angles of sepiolite mineral powder before and after modification obtained in example 8 of the present invention.

Detailed Description

The invention prepares the sepiolite mineral powder with non-polar surface, and the preferred embodiment is as follows:

the formula comprises the following components in percentage by weight (based on the weight of the sepiolite mineral powder): palmitic acid: anhydrous ethanol: ferric chloride hexahydrate: water 1: 0.0008-0.02: 3.945: 0.006850-0.027375: 7.5; the reaction conditions are as follows: the reaction time is 10-100 min, and the modification temperature is 30-60 ℃.

The palmitic acid, namely the palmitic acid, has more carbon atoms on a molecular chain and strong non-polarity, and can be non-polarized by being grafted on the surface of the sepiolite mineral powder. The absolute ethyl alcohol is a solvent of palmitic acid and plays a role in promoting the dispersion of palmitic acid molecules in a reaction system. The ferric chloride hexahydrate is used as a catalyst, the ferric chloride is a strong Lewis acid, the catalytic mechanism is that an outer layer hollow orbit of the Lewis acid and carbonyl of carboxylic acid form a stable complex, and the complex reacts with silicon (aluminum) alcoholic hydroxyl on the solid surface, so that the activation energy of the esterification reaction is reduced, and the reaction efficiency is obviously improved.

In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be further described below by way of examples.

Example 1: the mass ratio of each component and the specific steps in the embodiment are as follows:

sepiolite mineral powder: palmitic acid: anhydrous ethanol: ferric chloride hexahydrate: water 1: 0.02: 3.945: 0.027375: 7.5.

1) weighing 0.08g of palmitic acid, adding the palmitic acid into a 50mL beaker, adding 20mL of absolute ethyl alcohol, and stirring until the palmitic acid is completely dissolved;

2) weighing 4g of sepiolite mineral powder, adding into a 100mL beaker, adding 30mL of deionized water, and uniformly stirring by using a heat collection type magnetic stirrer at the rotating speed of 300r/min, wherein the water bath temperature is 30 ℃;

3) 0.1095g of FeCl were weighed₃·6H₂Adding O into the beaker in the step 2), and stirring until the O is completely dissolved;

4) adding the palmitic acid ethanol solution prepared in the step 1) into the beaker in the step 3), keeping the rotating speed and the water bath temperature unchanged, and reacting for 40 min;

5) and (3) carrying out suction filtration on the reaction solution obtained in the step 4), washing the reaction solution for 2 times by using 30mL of absolute ethyl alcohol, washing the reaction solution for 2 times by using 30mL of deionized water, and drying the reaction solution for 8 hours at 80 ℃ to obtain a final product.

Example 2: the mass ratio of each component and the specific steps in the embodiment are as follows:

sepiolite mineral powder: palmitic acid: anhydrous ethanol: ferric chloride hexahydrate: water 1: 0.015: 3.945: : 0.027375: 7.5.

1) weighing 0.06g of palmitic acid, adding the palmitic acid into a 50mL beaker, adding 20mL of absolute ethyl alcohol, and stirring until the palmitic acid is completely dissolved;

3) 0.1095g of FeCl were weighed₃·6H₂Adding O into the beaker in the step 2), and stirring until the O is completely dissolved;

4) adding the palmitic acid ethanol solution prepared in the step 1) into the beaker in the step 3), keeping the rotating speed and the water bath temperature unchanged, and reacting for 40 min;

Example 3: the mass ratio of each component and the specific steps in the embodiment are as follows:

sepiolite mineral powder: palmitic acid: anhydrous ethanol: ferric chloride hexahydrate: water 1: 0.01: 3.945: 0.027375: 7.5.

1) weighing 0.04g of palmitic acid, adding the palmitic acid into a 50mL beaker, adding 20mL of absolute ethyl alcohol, and stirring until the palmitic acid is completely dissolved;

3) 0.1095g of FeCl were weighed₃·6H₂Adding O into the beaker in the step 2), and stirring until the O is completely dissolved;

4) adding the palmitic acid ethanol solution prepared in the step 1) into the beaker in the step 3), keeping the rotating speed and the water bath temperature unchanged, and reacting for 40 min;

Example 4: the mass ratio of each component and the specific steps in the embodiment are as follows:

sepiolite mineral powder: palmitic acid: anhydrous ethanol: ferric chloride hexahydrate: water 1: 0.007: 3.945: 0.027375: 7.5.

1) weighing 0.028g of palmitic acid, adding the palmitic acid into a 50mL beaker, adding 20mL of absolute ethyl alcohol, and stirring until the palmitic acid is completely dissolved;

3) 0.1095g of FeCl were weighed₃·6H₂Adding O into the beaker in the step 2), and stirring until the O is completely dissolved;

4) adding the palmitic acid ethanol solution prepared in the step 1) into the beaker in the step 3), keeping the rotating speed and the water bath temperature unchanged, and reacting for 40 min;

Example 5: the mass ratio of each component and the specific steps in the embodiment are as follows:

sepiolite mineral powder: palmitic acid: anhydrous ethanol: ferric chloride hexahydrate: water 1: 0.004: 3.945: : 0.027375: 7.5.

1) weighing 0.016g of palmitic acid, adding the palmitic acid into a 50mL beaker, adding 20mL of absolute ethyl alcohol, and stirring until the palmitic acid is completely dissolved;

3) 0.1095g of FeCl were weighed₃·6H₂Adding O into the beaker in the step 2), and stirring until the O is completely dissolved;

4) adding the palmitic acid ethanol solution prepared in the step 1) into the beaker in the step 3), keeping the rotating speed and the water bath temperature unchanged, and reacting for 40 min;

Example 6: the mass ratio of each component and the specific steps in the embodiment are as follows:

sepiolite mineral powder: palmitic acid: anhydrous ethanol: ferric chloride hexahydrate: water 1: 0.002: 3.945: : 0.027375: 7.5.

1) weighing 0.008g of palmitic acid, adding the palmitic acid into a 50mL beaker, adding 20mL of absolute ethyl alcohol, and stirring until the palmitic acid is completely dissolved;

3) 0.1095g of FeCl were weighed₃·6H₂Adding O into the beaker in the step 2), and stirring until the O is completely dissolved;

4) adding the palmitic acid ethanol solution prepared in the step 1) into the beaker in the step 3), keeping the rotating speed and the water bath temperature unchanged, and reacting for 40 min;

Example 7: the mass ratio of each component and the specific steps in the embodiment are as follows:

sepiolite mineral powder: palmitic acid: anhydrous ethanol: ferric chloride hexahydrate: water 1: 0.0008: 3.945: 0.027375: 7.5.

1) weighing 0.0032g of palmitic acid, adding the palmitic acid into a 50mL beaker, adding 20mL of absolute ethyl alcohol, and stirring until the palmitic acid is completely dissolved;

3) 0.1095g of FeCl were weighed₃·6H₂Adding O into the beaker in the step 2), and stirring until the O is completely dissolved;

4) adding the palmitic acid ethanol solution prepared in the step 1) into the beaker in the step 3), keeping the rotating speed and the water bath temperature unchanged, and reacting for 40 min;

Example 8: the mass ratio of each component and the specific steps in the embodiment are as follows:

sepiolite mineral powder: palmitic acid: anhydrous ethanol: ferric chloride hexahydrate: water 1: 0.015: 3.945: : 0.020525: 7.5.

1) weighing 0.06g of palmitic acid, adding the palmitic acid into a 50mL beaker, adding 20mL of absolute ethyl alcohol, and stirring until the palmitic acid is completely dissolved;

3) 0.0821g of FeCl were weighed₃·6H₂Adding O into the beaker in the step 2), and stirring until the O is completely dissolved; (ii) a

4) Adding the palmitic acid ethanol solution prepared in the step 1) into the beaker in the step 3), keeping the rotating speed and the water bath temperature unchanged, and reacting for 40 min;

Example 9: the mass ratio of each component and the specific steps in the embodiment are as follows:

sepiolite mineral powder: palmitic acid: anhydrous ethanol: ferric chloride hexahydrate: water 1: 0.015: 3.945: : 0.0137: 7.5.

1) weighing 0.06g of palmitic acid, adding the palmitic acid into a 50mL beaker, adding 20mL of absolute ethyl alcohol, and stirring until the palmitic acid is completely dissolved;

3) 0.0548g of FeCl were weighed₃·6H₂Adding O into the beaker in the step 2), and stirring until the O is completely dissolved;

4) adding the palmitic acid ethanol solution prepared in the step 1) into the beaker in the step 3), keeping the rotating speed and the water bath temperature unchanged, and reacting for 40 min;

Example 10: the mass ratio of each component and the specific steps in the embodiment are as follows:

sepiolite mineral powder: palmitic acid: anhydrous ethanol: ferric chloride hexahydrate: water 1: 0.015: 3.945: : 0.00685: 7.5.

1) weighing 0.06g of palmitic acid, adding the palmitic acid into a 50mL beaker, adding 20mL of absolute ethyl alcohol, and stirring until the palmitic acid is completely dissolved;

3) weigh 0.0274g FeCl₃·6H₂Adding O into the beaker in the step 2), and stirring until the O is completely dissolved; (ii) a

4) Adding the palmitic acid ethanol solution prepared in the step 1) into the beaker in the step 3), keeping the rotating speed and the water bath temperature unchanged, and reacting for 40 min;

Example 11: the mass ratio of each component and the specific steps in the embodiment are as follows:

sepiolite mineral powder: palmitic acid: anhydrous ethanol: ferric chloride hexahydrate: water 1: 0.015: 3.945: : 0.020525: 7.5.

1) weighing 0.06g of palmitic acid, adding the palmitic acid into a 50mL beaker, adding 20mL of absolute ethyl alcohol, and stirring until the palmitic acid is completely dissolved;

3) 0.0821g of FeCl were weighed₃·6H₂Adding O into the beaker in the step 2), and stirring until the O is completely dissolved; (ii) a

4) Adding the palmitic acid ethanol solution prepared in the step 1) into the beaker in the step 3), keeping the rotating speed and the water bath temperature unchanged, and reacting for 10 min;

Example 12: the mass ratio of each component and the specific steps in the embodiment are as follows:

sepiolite mineral powder: palmitic acid: anhydrous ethanol: ferric chloride hexahydrate: water 1: 0.015: 3.945: : 0.020525: 7.5.

1) weighing 0.06g of palmitic acid, adding the palmitic acid into a 50mL beaker, adding 20mL of absolute ethyl alcohol, and stirring until the palmitic acid is completely dissolved;

3) 0.0821g of FeCl were weighed₃·6H₂Adding O into the beaker in the step 2), and stirring until the O is completely dissolved; (ii) a

4) Adding the palmitic acid ethanol solution prepared in the step 1) into the beaker in the step 3), keeping the rotating speed and the water bath temperature unchanged, and reacting for 30 min;

Example 13: the mass ratio of each component and the specific steps in the embodiment are as follows:

sepiolite mineral powder: palmitic acid: anhydrous ethanol: ferric chloride hexahydrate: water 1: 0.015: 3.945: : 0.020525: 7.5.

1) weighing 0.06g of palmitic acid, adding the palmitic acid into a 50mL beaker, adding 20mL of absolute ethyl alcohol, and stirring until the palmitic acid is completely dissolved;

3) 0.0821g of FeCl were weighed₃·6H₂Adding O into the beaker in the step 2), and stirring until the O is completely dissolved; (ii) a

4) Adding the palmitic acid ethanol solution prepared in the step 1) into the beaker in the step 3), keeping the rotating speed and the water bath temperature unchanged, and reacting for 60 min;

Example 14: the mass ratio of each component and the specific steps in the embodiment are as follows:

sepiolite mineral powder: palmitic acid: anhydrous ethanol: ferric chloride hexahydrate: water 1: 0.015: 3.945: : 0.020525: 7.5.

1) weighing 0.06g of palmitic acid, adding the palmitic acid into a 50mL beaker, adding 20mL of absolute ethyl alcohol, and stirring until the palmitic acid is completely dissolved;

3) 0.0821g FeC were weighedl₃·6H₂Adding O into the beaker in the step 2), and stirring until the O is completely dissolved; (ii) a

4) Adding the palmitic acid ethanol solution prepared in the step 1) into the beaker in the step 3), keeping the rotating speed and the water bath temperature unchanged, and reacting for 100 min;

Example 15: the mass ratio of each component and the specific steps in the embodiment are as follows:

sepiolite mineral powder: palmitic acid: anhydrous ethanol: ferric chloride hexahydrate: water 1: 0.015: 3.945: : 0.020525: 7.5.

1) weighing 0.06g of palmitic acid, adding the palmitic acid into a 50mL beaker, adding 20mL of absolute ethyl alcohol, and stirring until the palmitic acid is completely dissolved;

3) 0.0821g of FeCl were weighed₃·6H₂Adding O into the beaker in the step 2), and stirring until the O is completely dissolved; (ii) a

4) Adding the palmitic acid ethanol solution prepared in the step 1) into the beaker in the step 3), keeping the rotating speed and the water bath temperature unchanged, and reacting for 40 min;

Example 16: the mass ratio of each component and the specific steps in the embodiment are as follows:

sepiolite mineral powder: palmitic acid: anhydrous ethanol: ferric chloride hexahydrate: water 1: 0.015: 3.945: : 0.020525: 7.5.

1) weighing 0.06g of palmitic acid, adding the palmitic acid into a 50mL beaker, adding 20mL of absolute ethyl alcohol, and stirring until the palmitic acid is completely dissolved;

3) 0.0821g of FeCl were weighed₃·6H₂Adding O into the beaker in the step 2), and stirring until the O is completely dissolved; (ii) a

4) Adding the palmitic acid ethanol solution prepared in the step 1) into the beaker in the step 3), keeping the rotating speed and the water bath temperature unchanged, and reacting for 40 min;

Example 17: the mass ratio of each component and the specific steps in the embodiment are as follows:

sepiolite mineral powder: palmitic acid: anhydrous ethanol: ferric chloride hexahydrate: water 1: 0.015: 3.945: : 0.020525: 7.5.

1) weighing 0.06g of palmitic acid, adding the palmitic acid into a 50mL beaker, adding 20mL of absolute ethyl alcohol, and stirring until the palmitic acid is completely dissolved;

3) 0.0821g of FeCl were weighed₃·6H₂Adding O into the beaker in the step 2), and stirring until the O is completely dissolved; (ii) a

4) Adding the palmitic acid ethanol solution prepared in the step 1) into the beaker in the step 3), keeping the rotating speed and the water bath temperature unchanged, and reacting for 40 min;

The product obtained in example 8 was used as an example for the following characterization.

The results of the spectral analysis of the sepiolite mineral powder before and after the nonpolar modification by using a Fourier infrared spectrometer (FT-IR-IS50) are shown in FIG. 2, and it can be seen from the graph that 2920cm IS on the spectral line of the nonpolar modified powder^-1And 2840cm^-1New peak score appeared inIs other than-CH₃、—CH₂The stretching vibration absorption peak of (2) indicates that the fatty chain is successfully grafted on the surface of the powder.

The sepiolite mineral powder samples before and after nonpolar modification are tabletted, and the static water contact angle is measured by using the contact angle measuring instrument SDC-100, and the result is shown in figure 3, and it can be seen from figure 3 that the static water contact angle is larger along with the increase of the amount of palmitic acid, namely the hydrophobicity of the sample is better. Figure 1 is a visual effect of its hydrophobicity.

To quantify the results of the nonpolar modification of the sepiolite mineral powders of examples 1 to 17. Weighing a certain amount of powder sample subjected to surface modification, placing the powder sample in a beaker filled with purified water with a certain volume, and stirring for 1-2 min at a certain rotating speed; and then standing, scraping the powder material on the surface of the aqueous solution after the solution is clarified, filtering, drying and weighing the powder material which is deposited at the bottom of the beaker. According to the formula:

wherein H represents the proportion of powder particles that have been made non-polar, i.e., the degree of non-polar. Inorganic powder without surface non-polar (i.e., modified) treatment, H ═ 0; when the non-polarization treatment is most thorough, H is 1 (100%); the change process of H from 0 to 1 can reflect the degree of non-polarization of the powder surface from small to large, namely the degree of good and bad surface organic treatment effect, and the results are shown in Table 1.

TABLE 1 influence of the proportions of the formulations, the reaction temperature and the reaction time on the degree of activation of modification of sepiolite mineral powders

By integrating the data of the whole table, the sepiolite mineral powder: palmitic acid: anhydrous ethanol: ferric chloride hexahydrate: water 1: 0.015: 3.945: 0.020525: 7.5 is the optimal formula composition and weight ratio; the reaction time was 40min and the reaction temperature was 30 ℃ which is the optimum reaction condition.

Example 18:

general carbon black, calcium carbonate, pottery clay and surface non-polar sepiolite mineral powder prepared by adopting the optimal formula composition and the optimal reaction condition are respectively used as fillers (the mass percentage of the fillers is 16 percent), natural rubber-styrene butadiene rubber composite rubber samples are prepared, 300 percent of tensile strength, elongation at break and tearing strength of each sample are tested, and the specific performance indexes are shown in table 2.

TABLE 2 comparison of Properties of Natural rubber composite samples of non-polar sepiolite mineral powder fillers and other fillers on the surface

As can be seen from Table 2, the composite rubber sample using the sepiolite mineral powder with non-polar surface as the filler has several indexes close to or better than those of general carbon black except tear strength, and is obviously better than calcium carbonate and pottery clay, so that the composite rubber sample has high commercial value.

Example 19:

calcium carbonate, pottery clay and surface non-polar sepiolite mineral powder prepared by adopting the optimal formula composition and the optimal reaction conditions are respectively used as fillers (the filling mass percentage is 16 percent), plastic (PP) composite samples are prepared, the tensile strength, the elongation at break, the bending strength, the bending modulus and the notch impact strength of each sample are tested, and the specific performance indexes are shown in table 3.

TABLE 3 comparison of the Properties of Plastic (PP) composite samples of modified sepiolite mineral powder Filler and other Filler

As can be seen from Table 3, when the surface-non-polar sepiolite mineral powder is used as a plastic (PP) filler, various performance indexes are better than those of calcium carbonate and argil, so that the performance advantages brought by the surface-non-polar sepiolite mineral powder as a plastic filler can be illustrated.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

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