Bio-based epoxy fatty acid ester compound modified silicon dioxide nanoparticles as well as preparation method and application thereof

Abstract

The invention provides bio-based epoxy fatty acid ester compound modified silicon dioxide nanoparticles as well as a preparation method and application thereof, and belongs to the technical field of nanoparticle modification. According to the invention, the bio-based epoxy fatty acid ester compound is used as a green coupling agent to perform surface modification on the silicon dioxide nanoparticles, and the hydrophilic surfaces of the silicon dioxide nanoparticles are coated with the bio-based epoxy fatty acid ester compound through chemical bonding, so that the silicon dioxide nanoparticles are endowed with surface hydrophobicity or amphipathicity and good reactivity; and when used as a polymer filler, the polymer filler can significantly improve the mechanical properties and processability of a polymer.

Description

Technical Field

[0001] The invention relates to the technical field of nanoparticle modification, and in particular to a bio-based epoxy fatty acid ester compound modified silicon dioxide nanoparticle, a preparation method and application thereof. Background Art

[0002] In nanocomposite applications, silica nanoparticles or (SNPs) are considered as one of the most important nanofillers at the forefront of composite materials. The most advantageous features of SNPs are their low production cost, combined with ultra-high surface area, strong adsorption, good dispersibility, high chemical purity and excellent stability. However, the main problem with the use of SNPs in polymer composites is the poor compatibility between hydrophobic polymers and hydrophilic SNPs, which leads to the easy formation of three-dimensional networks associated with filler-filler interactions due to strong hydrogen bonds generated by the hydroxyl functional groups on the surface of SNPs, known as SiO2 aggregates, which can lead to the degradation of the mechanical properties of the composites. In addition, the formation of such SiO2 aggregates can also lead to a significant increase in the viscosity of the polymer system, resulting in poor processability.

[0003] The prior art has adopted surface modification of SNPs to minimize filler-filler interactions and reduce their tendency to form aggregates. Chemical modification is to change the surface properties of SNPs by forming covalent bonds between the modifier and the SNP surface; chemical modification can use various coupling agents, such as carboxylic acids, polymers, silanes, and organophosphorus molecules. However, the above modification methods are mostly toxic and not environmentally friendly. Therefore, a green, renewable, non-toxic and environmentally friendly SNP modification method is needed. Summary of the invention

[0004] In view of this, the object of the present invention is to provide a bio-based epoxy fatty acid ester compound modified silica nanoparticles and a preparation method and application thereof. The preparation method provided by the present invention is green, renewable, non-toxic and environmentally friendly, and the obtained bio-based epoxy fatty acid ester compound modified silica nanoparticles can significantly improve the mechanical properties and processing properties of the polymer when used as a polymer filler.

[0005] In order to achieve the above-mentioned object of the invention, the present invention provides the following technical solutions:

[0006] The present invention provides a method for preparing bio-based epoxy fatty acid ester compound modified silicon dioxide nanoparticles, comprising the following steps:

[0007] The bio-based epoxy fatty acid ester compound, an alcohol-containing organic solvent and a nucleophilic reagent are mixed to perform a ring-opening reaction to obtain a ring-opening reaction product;

[0008] The ring-opening reaction product is mixed with silicon dioxide nanoparticles, and a condensation reaction is carried out under alkaline conditions to obtain epoxidized vegetable oil compound-modified silicon dioxide nanoparticles.

[0009] Preferably, the bio-based epoxy fatty acid ester compound contains at least 95 wt% of the structure represented by Formula I or Formula II:

[0010]

[0011] In Formula I or Formula II, R' is a hydrogen atom, a substituted or unsubstituted C1-12 hydrocarbon group;

[0012] R1, R2 and R3 are independently selected from one of the compounds of formula III to formula V or a mixture thereof;

[0013]

[0014] In Formula III to Formula V, R is independently a substituted or unsubstituted C2-C30 hydrocarbon group, and the C2-C30 hydrocarbon group structure includes at least one oxygen atom connected to two different adjacent carbon atoms of the C2-C30 hydrocarbon group.

[0015] Preferably, the bio-based epoxy fatty acid ester compound includes one or more of epoxidized vegetable oil, epoxidized fatty acid and epoxidized fatty acid ester.

[0016] Preferably, the epoxidized vegetable oil comprises one or more of epoxidized soybean oil, epoxidized palm oil, epoxidized olive oil, epoxidized cottonseed oil, epoxidized coconut oil, epoxidized linseed oil, epoxidized safflower oil, epoxidized sunflower seed oil, epoxidized rapeseed oil, epoxidized castor oil, epoxidized rapeseed oil, epoxidized jatropha oil, epoxidized jojoba oil, epoxidized algae oil, epoxidized tall oil, epoxidized corn oil, epoxidized tung oil, epoxidized rubber seed oil, epoxidized moringa oil and epoxidized tea oil;

[0017] The epoxidized fatty acid esters include one or more of epoxidized crotonate, epoxidized myristate, epoxidized palmitoleate, epoxidized oleate, epoxidized linoleate, epoxidized linoleate, epoxidized elaidate, epoxidized elaeolate, epoxidized medate, epoxidized octadecenoate and epoxidized arachidonic acid esters;

[0018] The epoxidized fatty acid includes one or more of epoxidized crotonic acid, epoxidized myristic acid, epoxidized palmitoleic acid, epoxidized oleic acid, epoxidized linoleic acid, epoxidized linolenic acid, epoxidized elaidic acid, epoxidized eleostearic acid, epoxidized eicosenoic acid ester, epoxidized medate ester, epoxidized octadecenoic acid ester and epoxidized arachidonic acid ester.

[0019] Preferably, the alcohol-containing organic solvent is an alcohol solvent, or a mixture of an alcohol solvent and an organic solvent; the nucleophilic reagent is sodium hydroxide and / or sodium methoxide;

[0020] The temperature of the ring-opening reaction is 40-110° C., and the time is 30-240 min.

[0021] Preferably, the mass of the silicon dioxide nanoparticles is 1 to 30% of the mass of the ring-opening reaction product;

[0022] The pH value of the alkaline condition is ≥8.

[0023] Preferably, the condensation reaction temperature is 40-110° C. and the reaction time is 30-240 min.

[0024] The present invention provides bio-based epoxy fatty acid ester compound-modified silica nanoparticles prepared by the above preparation method, characterized in that the silica nanoparticles include silica nanoparticles and bio-based epoxy fatty acid ester compounds modified on the surface of the silica nanoparticles.

[0025] The present invention provides the use of the bio-based epoxy fatty acid ester compound modified silicon dioxide nanoparticles as polymer fillers.

[0026] Preferably, the amount of the bio-based epoxy fatty acid ester compound modified silica nanoparticles added to the polymer is 2 to 10 wt %.

[0027] The present invention provides a method for preparing bio-based epoxy fatty acid ester compound modified silica nanoparticles, comprising the following steps: mixing bio-based epoxy fatty acid ester compounds, alcohol-containing organic solvents and nucleophilic reagents, performing a ring-opening reaction, and obtaining a ring-opening reaction product; mixing the ring-opening reaction product with silica nanoparticles, and performing a condensation reaction under alkaline conditions to obtain epoxidized plant oil compound modified silica nanoparticles. The present invention uses bio-based epoxy fatty acid ester compounds as green coupling agents to perform surface modification on silica nanoparticles, and coats the hydrophilic surface of the silica nanoparticles through chemical bonding, thereby giving the silica nanoparticles surface hydrophobicity or amphiphilicity and good reactivity, and can significantly improve the mechanical properties and processing properties of the polymer when used as a polymer filler. Specifically, the bio-based epoxy fatty acid ester compounds expose hydroxyl groups through a ring-opening reaction, and then undergo a dehydration condensation reaction with the silanol groups on the surface of the silica nanoparticles, and are bonded to the surface of the silica nanoparticles through covalent bonds and hydrogen bonds. The bio-based epoxy fatty acid ester compound used in the present invention is a non-toxic renewable resource and sustainable material with a wide source, low cost, good compatibility with non-polar polymers, and can effectively avoid the reduction of polymer mechanical properties and processing properties caused by the aggregation of silica nanoparticles in the polymer.

[0028] In addition, the preparation method provided by the present invention is simple to operate, has mild conditions, and is easy to realize industrial mass production. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a scanning electron microscope image of nano-silicon dioxide;

[0030] Figure 2 The transmission electron microscope images of nano-silicon dioxide and modified nano-silicon dioxide;

[0031] Figure 3 These are scanning electron microscope images of natural rubber / nano-silica composite materials and natural rubber / modified nano-silica composite materials. DETAILED DESCRIPTION

[0032] The present invention provides a method for preparing bio-based epoxy fatty acid ester compound modified silicon dioxide nanoparticles, comprising the following steps:

[0033] The bio-based epoxy fatty acid ester compound, an alcohol-containing organic solvent and a nucleophilic reagent are mixed to perform a ring-opening reaction to obtain a ring-opening reaction product;

[0034] The ring-opening reaction product is mixed with silicon dioxide nanoparticles, and a condensation reaction is carried out under alkaline conditions to obtain epoxidized vegetable oil compound-modified silicon dioxide nanoparticles.

[0035] In the present invention, the bio-based epoxy fatty acid ester compound contains at least 95 wt% of the structure shown in Formula I or Formula II:

[0036]

[0037] In Formula I or Formula II, R' is a hydrogen atom, a substituted or unsubstituted C1-12 hydrocarbon group; in the present invention, the substituent in the substituted C1-12 hydrocarbon group is preferably a C1-C4 hydrocarbon group or a halogen;

[0038] R1, R2 and R3 are independently selected from one of the compounds of formula III to formula V or a mixture thereof;

[0039]

[0040] In formula III to formula V, R is independently a substituted or unsubstituted C2-C30 hydrocarbon group, wherein the C2-C30 hydrocarbon group structure includes at least one oxygen atom connected to two different adjacent carbon atoms of the C2-C30 hydrocarbon group. In the present invention, the substituent in the substituted C2-C30 hydrocarbon group is preferably a C1-C4 hydrocarbon group or a halogen.

[0041] In the present invention, the bio-based epoxy fatty acid ester compound preferably includes one or more of epoxidized vegetable oil, epoxidized fatty acid and epoxidized fatty acid ester. In the present invention, the fatty acid structure in the epoxidized vegetable oil, epoxidized fatty acid and epoxidized fatty acid ester can be a short-chain fatty acid (2 to 4 carbon atoms), a medium-chain fatty acid (6 to 10 carbon atoms) or a long-chain fatty acid (12 to 30 carbon atoms).

[0042] In the present invention, the epoxidation degree of the epoxidized vegetable oil, epoxidized fatty acid and epoxidized fatty acid ester is preferably 1 to 100%, more preferably 10 to 90%, and further preferably 20 to 80%.

[0043] In the present invention, the epoxidized vegetable oil preferably includes one or more of epoxidized soybean oil, epoxidized palm oil, epoxidized olive oil, epoxidized cottonseed oil, epoxidized coconut oil, epoxidized linseed oil, epoxidized safflower oil, epoxidized sunflower seed oil, epoxidized rapeseed oil, epoxidized castor oil, epoxidized rapeseed oil, epoxidized jatropha oil, epoxidized jojoba oil, epoxidized algae oil, epoxidized tall oil, epoxidized corn oil, epoxidized tung oil, epoxidized rubber seed oil, epoxidized moringa oil and epoxidized tea oil;

[0044] The epoxidized fatty acid preferably includes one or more of epoxidized crotonic acid, epoxidized myristic acid, epoxidized palmitoleic acid, epoxidized oleic acid, epoxidized linoleic acid, epoxidized linolenic acid, epoxidized elaidic acid, epoxidized eleostearic acid, epoxidized eicosenoic acid, epoxidized mead acid, epoxidized octadecenoic acid and epoxidized arachidonic acid;

[0045] The epoxidized fatty acid ester preferably includes one or more of epoxidized crotonate, epoxidized myristate, epoxidized palmitoleate, epoxidized oleate, epoxidized linoleate, epoxidized linoleate, epoxidized elaidate, epoxidized elaeolate, epoxidized eicosenoate, epoxidized medate, epoxidized octadecenoate and epoxidized arachidonic acid ester; in the present invention, the ester structure in the epoxidized fatty acid ester is preferably methyl ester, ethyl ester, propyl ester or butyl ester.

[0046] The present invention mixes a bio-based epoxy fatty acid ester compound, an alcohol-containing organic solvent and a nucleophilic reagent, performs a ring-opening reaction, and obtains a ring-opening reaction product. In the present invention, the alcohol-containing organic solvent is preferably an alcohol solvent, or a mixture of an alcohol solvent and an organic solvent; in the present invention, the alcohol solvent is preferably one or more of methanol, ethanol, isopropanol and butanol. In the present invention, when it is a mixture of an alcohol solvent and an organic solvent, the organic solvent is preferably one or more of dichloromethane, hexane and toluene. The present invention has no special requirements for the volume ratio of the alcohol solvent and the organic solvent. As a specific embodiment of the present invention, the volume ratio of the alcohol solvent to the organic solvent is preferably 1:1. In the present invention, the mass ratio of the bio-based epoxy fatty acid ester compound to the organic solvent is preferably 1:1 to 100, more preferably 1:5 to 80, and further preferably 1:10 to 50.

[0047] In the present invention, the nucleophilic agent is preferably sodium hydroxide and / or sodium methoxide; in the present invention, the molar ratio of the bio-based epoxy fatty acid ester compound to the nucleophilic agent is preferably 1:1.

[0048] In the present invention, the temperature of the ring-opening reaction is preferably 40-110°C, specifically 40°C, 50°C, 60°C, 70°C, 80°C, 90°C, 100°C or 110°C; in the present invention, the time of the ring-opening reaction is preferably 30-240min, specifically 30min, 60min, 90min, 120min, 150min, 180min, 210min or 240min.

[0049] After the ring-opening reaction, the present invention does not perform post-treatment on the obtained ring-opening reaction product, and directly performs the next step of reaction.

[0050] The present invention mixes the ring-opening reaction product with silicon dioxide nanoparticles, and performs a condensation reaction under alkaline conditions to obtain epoxidized vegetable oil compound modified silicon dioxide nanoparticles. In the present invention, the surface of the silicon dioxide nanoparticles contains hydroxyl groups.

[0051] In the present invention, the particle size of the silicon dioxide nanoparticles is preferably 7 to 10 nm. In the present invention, the silicon dioxide nanoparticles are preferably provided in the form of a solid or a suspension, and the solvent of the silicon dioxide nanoparticle suspension is preferably water and / or ethanol, and the concentration is preferably 10 to 30 wt%, more preferably 20 wt%.

[0052] In the present invention, the mass of the silicon dioxide nanoparticles is preferably 1 to 30% of the mass of the ring-opening reaction product, and more preferably 5 to 15%.

[0053] In the present invention, the pH value of the alkaline condition is preferably ≥ 8. In the present invention, sodium hydroxide solution is preferably used to adjust the pH value of the condensation reaction system.

[0054] In the present invention, the temperature of the condensation reaction is preferably 40-110°C, specifically 40°C, 50°C, 60°C, 70°C, 80°C, 90°C, 100°C or 110°C; in the present invention, the time of the condensation reaction is preferably 30-240min, specifically 30min, 60min, 90min, 120min, 150min, 180min, 210min or 240min.

[0055] After the condensation reaction, the present invention preferably performs post-treatment on the obtained condensation reaction product, and the post-treatment preferably comprises the following steps:

[0056] The obtained condensation reaction product is subjected to solid-liquid separation, and the obtained solid is washed and dried.

[0057] In the present invention, the solid-liquid separation is preferably suction filtration; in the present invention, the washing is preferably methanol washing; the drying is preferably vacuum drying, and the temperature of the vacuum drying is preferably 60°C.

[0058] The present invention provides bio-based epoxy fatty acid ester compound modified silica nanoparticles prepared by the above preparation method, comprising silica nanoparticles and bio-based epoxy fatty acid ester compound modified on the surface of the silica nanoparticles. In the present invention, the bio-based epoxy fatty acid ester compound is bonded to the surface of the silica nanoparticles through hydrogen bonds and covalent bonds.

[0059] The present invention provides the use of the bio-based epoxy fatty acid ester compound modified silicon dioxide nanoparticles as polymer fillers.

[0060] In the present invention, the polymer preferably includes one or more of natural rubber and plastic. In the present invention, the plastic is preferably one or more of PET, PLA and PCL.

[0061] In the present invention, the amount of the bio-based epoxy fatty acid ester compound modified silica nanoparticles added to the polymer is preferably 2-10 wt %, more preferably 5 wt %.

[0062] The bio-based epoxy fatty acid ester compound modified silica nanoparticles provided by the present invention and the preparation method and application thereof are described in detail below in conjunction with the examples, but they should not be construed as limiting the scope of protection of the present invention.

[0063] Example 1

[0064] First, 3.75 g of epoxidized soybean oil, 20 mL of a methanol / toluene mixed solvent (volume ratio of 1:1) and 3 mL of a 7% sodium hydroxide solution were mixed in a beaker and stirred at 80° C. for 30 minutes to obtain a ring-opening reaction solution;

[0065] Then, 25 g of SNPs suspension (20 wt%) was added to the ring-opening reaction solution and stirred for 60 min. Afterwards, the SNPs were filtered and washed thoroughly with methanol, and then dried in a vacuum oven at 60° C. until constant weight was obtained to obtain epoxy soybean oil-modified silica nanoparticles.

[0066] Example 2

[0067] First, 250 mg of methyl epoxyoleate, 20 mL of methanol and 3 mL of 7% sodium hydroxide solution were mixed evenly in a beaker, and stirred at 40° C. for 120 min to obtain a ring-opening reaction solution;

[0068] Then, SNPs suspension (5 g silica gel dry weight) was added to the obtained ring-opening reaction solution, and the reaction mixture was stirred at 40°C for 4 h, then washed with a large amount of methanol, filtered, and dried in a vacuum drying oven at 60°C to constant weight to obtain epoxy oleic acid methyl ester-modified silica nanoparticles.

[0069] Example 3

[0070] First, 3 g of 12,13-epoxylinolenic acid, 200 mL of ethanol and 50 mL of a 3% sodium methoxide solution were mixed evenly in a beaker, and reacted at 50° C. for 90 min to obtain a ring-opening reaction solution;

[0071] Then, SNPs suspension (30 g silica gel dry weight) was added to the obtained ring-opening reaction solution, and the reaction mixture was stirred at 50°C for 2 h, then washed with a large amount of ethanol, filtered, and dried in a vacuum drying oven at 60°C to constant weight to obtain 12,13-epoxylinolenic acid modified silica nanoparticles.

[0072] The FTIR spectrum of the modified silica nanoparticles obtained in Example 1 is shown in Table 1.

[0073] Table 1 FTIR spectra of modified silica nanoparticles

[0074]

[0075]

[0076] It can be seen from Table 1 that the bio-based epoxy fatty acid ester compounds have been successfully grafted onto the surface of silica nanoparticles.

[0077] The chemical properties of the modified silica nanoparticles obtained in Examples 1 to 3 are shown in Table 2.

[0078] Table 2 Chemical properties of modified silica nanoparticles obtained in Examples 1 to 3

[0079] Test samples Surface contact angle (°) Surface tension (mN / m) Particle size (nm) Example 1 100～110 35～40 100～450 Example 2 60～80 45～50 20～150 Example 3 80～100 40～45 50～300

[0080] Test Case

[0081] The modified silica nanoparticles of Example 1 were used as fillers for natural rubber. The addition amounts of the modified silica nanoparticles in the natural rubber were 2wt%, 3wt%, and 5wt%, respectively. Unmodified nano-silicon dioxide was used as a comparison. The addition amount of the unmodified nano-silicon dioxide in the natural rubber was 5wt%. The effects of the modified silica nanoparticles on the properties of natural rubber are shown in Table 3.

[0082] Table 3 Effect of modified silica nanoparticles on the properties of natural rubber

[0083]

[0084] Among them, the scanning electron microscope image of nano-silicon dioxide is as follows Figure 1 As shown, the transmission electron microscopy images of nano-silica and modified nano-silica are as follows Figure 2 As shown, Figure 2 In the figure, A is a transmission electron microscope image of nano-silica, and B is a transmission electron microscope image of modified nano-silica. Figure 3 The scanning electron microscope images of natural rubber / nano-silicon dioxide composite materials and natural rubber / modified nano-silicon dioxide composite materials are shown in Figure 2. Figure 3 In the figure, A is a scanning electron microscope image of a natural rubber / nano-silicon dioxide (5wt%) composite material, and B is a scanning electron microscope image of a natural rubber / modified nano-silicon dioxide (5wt%) composite material. It can be seen from the figure that the modified nano-silicon dioxide has better dispersibility in the natural rubber matrix, a fuzzy interface with the rubber, and better compatibility.

[0085] It can be seen from Table 3 that nano-silicon dioxide has no reinforcing effect on natural rubber, but rather has a lower strength than natural rubber. Bio-based epoxy fatty acid ester compound modified silicon dioxide nanoparticles have a significant reinforcing effect on natural rubber, and the best effect is achieved when the dosage is 3wt%.

[0086] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A method for preparing bio-based epoxy fatty acid ester compound modified silica nanoparticles, characterized in that: The following steps are involved: The bio-based epoxy fatty acid ester compound, an alcohol-containing organic solvent and a nucleophilic reagent are mixed to perform a ring-opening reaction to obtain a ring-opening reaction product; The ring-opening reaction product is mixed with silicon dioxide nanoparticles, and a condensation reaction is carried out under alkaline conditions to obtain epoxidized vegetable oil compound-modified silicon dioxide nanoparticles.

2. The preparation method according to claim 1, characterized in that: The bio-based epoxy fatty acid ester compound contains at least 95 wt% of the structure shown in Formula I or Formula II: In Formula I or Formula II, R' is a hydrogen atom, a substituted or unsubstituted C1-12 hydrocarbon group; R1, R2 and R3 are independently selected from one of the compounds of formula III to formula V or a mixture thereof; In Formula III to Formula V, R is independently a substituted or unsubstituted C2-C30 hydrocarbon group, and the C2-C30 hydrocarbon group structure includes at least one oxygen atom connected to two different adjacent carbon atoms of the C2-C30 hydrocarbon group.

3. The preparation method according to claim 1 or 2, characterized in that: The bio-based epoxy fatty acid ester compound includes one or more of epoxidized vegetable oil, epoxidized fatty acid and epoxidized fatty acid ester.

4. The preparation method according to claim 3, characterized in that: The epoxidized vegetable oil comprises one or more of epoxidized soybean oil, epoxidized palm oil, epoxidized olive oil, epoxidized cottonseed oil, epoxidized coconut oil, epoxidized linseed oil, epoxidized safflower oil, epoxidized sunflower seed oil, epoxidized rapeseed oil, epoxidized castor oil, epoxidized rapeseed oil, epoxidized jatropha oil, epoxidized jojoba oil, epoxidized algae oil, epoxidized tall oil, epoxidized corn oil, epoxidized tung oil, epoxidized rubber seed oil, epoxidized moringa oil and epoxidized tea oil; The epoxidized fatty acid esters include one or more of epoxidized crotonate, epoxidized myristate, epoxidized palmitoleate, epoxidized oleate, epoxidized linoleate, epoxidized linoleate, epoxidized elaidate, epoxidized elaeolate, epoxidized medate, epoxidized octadecenoate and epoxidized arachidonic acid esters; The epoxidized fatty acid includes one or more of epoxidized crotonic acid, epoxidized myristic acid, epoxidized palmitoleic acid, epoxidized oleic acid, epoxidized linoleic acid, epoxidized linolenic acid, epoxidized elaidic acid, epoxidized eleostearic acid, epoxidized eicosenoic acid ester, epoxidized medate ester, epoxidized octadecenoic acid ester and epoxidized arachidonic acid ester.

5. The preparation method according to claim 1, characterized in that: The alcohol-containing organic solvent is an alcohol solvent, or a mixture of an alcohol solvent and an organic solvent; the nucleophilic reagent is sodium hydroxide and / or sodium methoxide; The temperature of the ring-opening reaction is 40-110° C., and the time is 30-240 min.

6. The preparation method according to claim 1 or 5, characterized in that: The mass of the silicon dioxide nanoparticles is 1 to 30% of the mass of the ring-opening reaction product; The pH value of the alkaline condition is ≥8.

7. The preparation method according to claim 1, characterized in that: The condensation reaction temperature is 40-110° C. and the reaction time is 30-240 min.

8. The bio-based epoxy fatty acid ester compound modified silica nanoparticles prepared by the preparation method according to any one of claims 1 to 7, characterized in that: The invention comprises silicon dioxide nanoparticles and bio-based epoxy fatty acid ester compounds modified on the surface of the silicon dioxide nanoparticles.

9. Use of the bio-based epoxy fatty acid ester compound modified silica nanoparticles according to claim 8 as polymer filler.

10. The use according to claim 9, characterized in that: The amount of the bio-based epoxy fatty acid ester compound modified silicon dioxide nanoparticles added to the polymer is 2-10 wt %.

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