Application of N,N,N-tri(2-hydroxypropyl)amine cyclic borate as grinding aid for inorganic non-metallic minerals

Abstract

The invention provides an application of N,N,N-tris(2-hydroxypropyl)amine cyclic borate as an inorganic non-metallic mineral grinding aid. The N,N,N-tris(2-hydroxypropyl)amine cyclic borate as a grinding aid has the effects of making the particles of the powder finer, having better dispersibility and better compatibility.

Description

Technical Field

[0001] The invention belongs to the field of production and processing of inorganic non-metallic minerals, and in particular relates to a grinding aid for inorganic non-metallic minerals. Background Art

[0002] Inorganic non-metallic powder materials are an important material with wide application. They are used in polymer material industries such as plastics, rubber, coatings and polymer composite materials. They have many specifications and varieties and high added value. They are important industrial products that cannot be lacking. Most inorganic powder materials, as fillers of organic materials, can greatly improve the natural defects of organic materials, so that the materials have the advantages of both organic and inorganic materials. For example: highly dispersed white carbon black as a tire additive can improve the wear resistance of tires, increase the life of tires, and is beneficial to energy conservation and emission reduction; heavy calcium as a plastic filler can improve the electrical insulation, acid and alkali resistance, and fire resistance of plastic products; mica can be used as a plastic reinforcing filler to improve the bending elastic modulus and tensile elastic modulus of plastic products. Since most inorganic non-metallic powder materials are polar or strongly polar hydrophilic substances, and organic polymers such as plastics, rubbers, and resins have non-polar hydrophobic surfaces, they have poor compatibility with each other. Inorganic non-metallic powder materials are difficult to disperse evenly in an organic matrix, which cannot achieve the purpose of improving material performance, and even lead to problems such as the decline of certain material properties.

[0003] At present, in order to make inorganic non-metallic powder materials reach the required fineness and compatibility, grinding aids and surface modifiers are often added in the pulverization process to improve fineness and compatibility at the same time, simplify the process flow and reduce costs. However, since the surface modifier is a polymer compound with hydrophilic and hydrophobic groups, after being adsorbed by the polar inorganic non-metallic powder material, its long chains will attract and entangle, resulting in adhesion between particles, coarsening of powder particles and reduced dispersibility. Summary of the invention

[0004] The purpose of the present invention is to address the deficiencies in the prior art and thereby provide an application of N,N,N-tris(2-hydroxypropyl)amine cyclic borate as an inorganic non-metallic mineral grinding aid. The use of N,N,N-tris(2-hydroxypropyl)amine cyclic borate as a grinding aid makes the powder particles finer, the dispersibility better, and the compatibility better.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is:

[0006] Application of N,N,N-tris(2-hydroxypropyl)amine cyclic borate as an inorganic non-metallic mineral grinding aid, N,N,N-tris(2-hydroxypropyl)amine cyclic borate, molecular formula C9H 18BNO3 is a white to yellowish brown solid with a density of 1.05g / cm3, a melting point of 150-157℃ and a boiling point of 196.2℃. Triisopropanolamine borate is also a coupling agent. The three-branched structure of the boron oxygen ester bond forms a cage structure. The outermost layers of boron and nitrogen atoms are empty orbitals and lone pairs of electrons, respectively, which makes its structure stable. Boron and nitrogen have both nucleophilic and electrophilic atoms, and are located outside the molecular configuration. They are easy to react with polar groups or atoms of organic and inorganic materials by chemical bonds, reduce the surface energy of the material, improve the dispersibility of the powder material, reduce the fineness of the particles, and improve the compatibility and dispersibility of inorganic mineral powder materials in organic materials.

[0007] In order to improve the grinding aid effect, as a further improvement of the technical solution, the mass proportion of N,N,N-tris(2-hydroxypropyl)amine cyclic borate in the grinding aid is 10-100wt%, and more preferably the mass proportion of N,N,N-tris(2-hydroxypropyl)amine cyclic borate is 50-100wt%.

[0008] As a further improvement of the technical solution, the grinding aid further contains 1-90wt% of hydroxyalkylamine derivatives. The hydroxyl and amino groups contained in the hydroxyalkylamine derivatives can act and adsorb with the polar groups on the surface of the powder particles, and can also act with the plastic or resin matrix, so as to achieve the effect of both aiding grinding and reducing fineness and improving compatibility.

[0009] As a further improvement of the technical solution, in order to balance reducing the particle fineness and compatibility of the powder, the grinding aid further contains 1-50wt% of a hydroxyalkylamine derivative.

[0010] As a further improvement of the technical solution, the hydroxyalkylamine derivative is hydroxyalkylamine and / or hydroxyalkylamine hydrochloride, and the hydroxyalkylamine is N,N-di(2-hydroxypropyl)amine, N,N,N-tri(2-hydroxyethyl)amine, N,N-di(2-hydroxyethyl)-N-(2-hydroxypropyl)amine, N,N-di(2-hydroxypropyl)-N-(2-hydroxyethyl)amine, N,N,N',N'-tetra(2-hydroxyethyl)ethylenediamine, N,N,N'-tri(2-hydroxyethyl)-N'-(2-hydroxypropyl)ethylenediamine, N,N-di(2-hydroxyethyl)-N',N'-di(2-hydroxyethyl) At least one of N,N,N'-tri(2-hydroxypropyl)-N'-(2-hydroxyethyl)ethylenediamine, N,N,N',N'-tetra(2-hydroxypropyl)ethylenediamine, N,N,N',N'-tetra(2-hydroxyethyl)propylenediamine, N,N,N'-tri(2-hydroxyethyl)-N'-(2-hydroxypropyl)propylenediamine, N,N-di(2-hydroxyethyl)-N',N'-di(2-hydroxypropyl)propylenediamine, N,N,N'-tri(2-hydroxypropyl)-N'-(2-hydroxyethyl)propylenediamine and N,N,N',N'-tetra(2-hydroxypropyl)propylenediamine.

[0011] As a further improvement of the technical solution, the grinding aid is added in an amount of no more than 0.5 wt % in the inorganic non-metallic mineral.

[0012] As a further improvement of the technical solution, the grinding aid is added in an amount of no more than 0.2 wt % in the inorganic non-metallic mineral.

[0013] As a further improvement of the technical solution, in order to improve the compatibility of the powder, reduce the oil absorption rate and increase the sedimentation volume, the grinding aid is used in combination with 1-25wt% of a surface modifier based on the mass of the grinding aid.

[0014] As a further improvement of the technical solution, in order to take into account both cost and surface modification effect, the surface modifier is at least one of oleic acid monoisopropanolamide, oleic acid diisopropanolamide, sodium stearate and titanate.

[0015] The present invention also protects an inorganic non-metallic mineral grinding aid according to the above application.

[0016] The present invention has outstanding substantial characteristics and significant progress compared with the prior art. Specifically, the N,N,N-tris(2-hydroxypropyl)amine cyclic borate of the present invention is used as a grinding aid, and the particles of the powder are finer, the dispersibility is better, and the compatibility is better. Furthermore, the N,N,N-tris(2-hydroxypropyl)amine cyclic borate and hydroxyalkylamine derivatives are used in combination as a composite grinding aid, which can reduce the fineness of the powder and improve the compatibility. Furthermore, in the application of the present invention, the grinding aid can be used in combination with a surface modifier to improve the compatibility of the powder, reduce the oil absorption rate and increase the sedimentation volume. N,N,N-tris(2-hydroxypropyl)amine cyclic borate as a grinding aid has the effect of making the particles of the powder finer, the dispersibility is better and the compatibility is better. DETAILED DESCRIPTION

[0017] The technical solution of the present invention is further described in detail below through specific implementation methods, but the content of the present invention is not limited to the following embodiments.

[0018] The grinding aid compositions of the embodiments and comparative examples are shown in Table 1:

[0019] Table 1 Composition of grinding aids (by mass percentage)

[0020]

[0021]

[0022] "-" in the table means that the corresponding compound was not added

[0023] 1. Sample preparation

[0024] The grinding aid was weighed according to the dosage (based on 5 kg of mineral), added with 5 kg of mineral and ground in a standard small mill for 5 minutes, the coarse powder was sieved through an 80-micron sieve, and the sieved powder was used as a sample.

[0025] The limestone involved in the embodiment is a natural ore from Liqiao, Anhui, with a CaCO3 content of more than 95wt%. The talc is a natural ore from Zhifang, Pingdu, Shandong, with a Mg3[Si4O 10 ](OH)2 content is greater than 95wt%.

[0026] 2. Performance Test

[0027] 1.45 micron sieve residue

[0028] The sample was passed through a 45 micron sieve and the residue was measured. The results are shown in Tables 2 and 3.

[0029] 2. Oil absorption value

[0030] Weigh 1g of sample, accurate to 0.01g, place it on a glass plate, and add dropwise with a microburette containing 1mL of dioctyl phthalate (DOP). Use a spatula to constantly stir and grind during the addition. The sample is initially dispersed, then gradually clumps until it is completely wetted and forms a whole clumping mass, which is the end point. Read the dosage V1, the oil absorption value of calcium carbonate or talcum powder (unit: mL / 100g) V=100*V1. The results are shown in Tables 2 and 3.

[0031] 2. Determination of sedimentation volume

[0032] Weigh 10 g of sample and add it into a graduated cylinder containing 100 mL of liquid paraffin. Stir it evenly with a clean glass rod for 2 minutes and then place it in a CHA-S type air bath constant temperature oscillator at 20±0.5℃ and 100 r / min. Oscillate it thoroughly for 15 minutes and then let it stand. Start timing at the same time. After a certain period of time, the height of the sample sedimentation surface (dispersed phase volume) is the sedimentation volume. The results are shown in Tables 2 and 3.

[0033] Table 2 Performance statistics of limestone powder obtained in Examples and Comparative Examples

[0034]

[0035]

[0036] By comparing Example 1 with Comparative Example 1, the present invention shows that the 45 micron sieve residue is reduced, the oil absorption value is reduced, the sedimentation volume is increased, and the dispersibility and compatibility of the powder are improved when N,N,N-tris(2-hydroxypropyl)amine cyclic borate is used alone compared with N,N,N-tris(2-hydroxypropyl)amine. The larger the amount of Example 1, the smaller the 45 micron sieve residue, the smaller the oil absorption value, and the larger the sedimentation volume.

[0037] By comparing Example 1 with Comparative Example 2, the present invention shows that the 45-micron sieve residue is greatly reduced, the oil absorption value is reduced, the sedimentation volume is increased, and the dispersibility and compatibility of the powder are improved when N,N,N-tris(2-hydroxypropyl)amine cyclic borate is used alone and the N,N,N-tris(2-hydroxypropyl)amine and titanate composition is compared. The larger the dosage of Example 1, the smaller the 45-micron sieve residue, the smaller the oil absorption value, and the larger the sedimentation volume.

[0038] Table 3 Performance statistics of talcum powder obtained in Examples and Comparative Examples

[0039]

[0040]

[0041] Example 7 and Comparative Example 1 are used for grinding talc ore. In the present invention, N,N,N-tris(2-hydroxypropyl)amine cyclic borate and N,N,N-tris(2-hydroxyethyl)amine cyclic borate, N,N,N-tris(2-hydroxyethyl)amine aminosulfonate, N,N-di(2-hydroxypropyl)-N-(2-hydroxyethyl)amine aminosulfonate, oleic acid diisopropanolamide, and titanate TC-114 are used in combination with N,N,N-tris(2-hydroxypropyl)amine. Compared with N,N,N-tris(2-hydroxypropyl)amine, at the same dosage, the 45-micron sieve residue of talc powder is reduced, the oil absorption value is reduced, the sedimentation volume is increased, and the dispersibility and compatibility of the powder are improved.

[0042] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the specific implementation methods of the present invention can still be modified or some technical features can be replaced by equivalents without departing from the spirit of the technical solution of the present invention, which should be included in the scope of the technical solution for protection of the present invention.

Claims

1. Application of N,N,N-tris(2-hydroxypropyl)amine cyclic borate as an inorganic non-metallic mineral grinding aid, characterized in that: The grinding aid is added in an amount of 0.1-0.5wt% in the inorganic non-metallic mineral; The inorganic non-metallic mineral is limestone or talc; the limestone is a natural ore with a CaCO3 content greater than 95wt%; the talc is Mg3[Si4O 10 ]Natural ore with an (OH)2 content greater than 95wt%.

2. The use according to claim 1, characterized in that: The mass proportion of N,N,N-tris(2-hydroxypropyl)amine cyclic borate in the grinding aid is 10-100wt%.

3. The use according to claim 1 or 2, characterized in that: The grinding aid further contains 1-90 wt % of a hydroxyalkylamine derivative.

4. The use according to claim 3, characterized in that: The grinding aid further contains 1-50wt% of a hydroxyalkylamine derivative.

5. The use according to claim 4, characterized in that: The hydroxyalkylamine derivative is hydroxyalkylamine and / or hydroxyalkylamine hydrochloride, and the hydroxyalkylamine is N,N-di(2-hydroxypropyl)amine, N,N,N-tri(2-hydroxyethyl)amine, N,N-di(2-hydroxyethyl)-N-(2-hydroxypropyl)amine, N,N-di(2-hydroxypropyl)-N-(2-hydroxyethyl)amine, N,N,N',N'-tetra(2-hydroxyethyl)ethylenediamine, N,N,N'-tri(2-hydroxyethyl)-N'-(2-hydroxypropyl)ethylenediamine, N,N-di(2-hydroxyethyl)-N',N'-di(2-hydroxypropyl)ethylenediamine , at least one of N,N,N'-tri(2-hydroxypropyl)-N'-(2-hydroxyethyl)ethylenediamine, N,N,N',N'-tetra(2-hydroxypropyl)ethylenediamine, N,N,N',N'-tetra(2-hydroxyethyl)propylenediamine, N,N,N'-tri(2-hydroxyethyl)-N'-(2-hydroxypropyl)propylenediamine, N,N-di(2-hydroxyethyl)-N',N'-di(2-hydroxypropyl)propylenediamine, N,N,N'-tri(2-hydroxypropyl)-N'-(2-hydroxyethyl)propylenediamine and N,N,N',N'-tetra(2-hydroxypropyl)propylenediamine.

6. The use according to claim 1, characterized in that: The grinding aid is added in an amount of 0.1 wt % in the inorganic non-metallic mineral.

7. The use according to claim 5, characterized in that: The mass of the grinding aid is used as a reference, and the grinding aid is used in combination with 1-25wt% of a surface modifier.

8. The use according to claim 7, characterized in that: The surface modifier is at least one of oleic acid monoisopropanolamide, oleic acid diisopropanolamide, sodium stearate and titanate.

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