Aluminum hydroxide composite filler, preparation method thereof and acrylic artificial stone

Abstract

The invention relates to an aluminum hydroxide composite filler, a preparation method thereof and an acrylic artificial stone, and belongs to the technical field of aluminum hydroxide fillers. The aluminum hydroxide composite filler comprises the following raw materials: first aluminum hydroxide and second aluminum hydroxide; the median particle size of the first aluminum hydroxide is 5-15 [mu] m, and the median particle size of the second aluminum hydroxide is 50-90 [mu] m; the weight ratio of the first aluminum hydroxide to the second aluminum hydroxide is (1-2): (1-3). The aluminum hydroxide composite filler is optimized from the aspects of multiple key performance indexes such as stacking density, particle size distribution, viscosity and oil absorption by compounding the aluminum hydroxide with different particle sizes and reasonably controlling the weight ratio of the aluminum hydroxide, and the performance of the aluminum hydroxide filler is improved.

Description

Technical Field

[0001] This application relates to the technical field of aluminum hydroxide fillers, and particularly relates to an aluminum hydroxide composite filler, a preparation method thereof, and an acrylic artificial stone. Background Art

[0002] Acrylic artificial stone is a kind of artificial board, mainly used for kitchen countertops, decorative materials, etc. Its radiation level is almost the same as that of the human body's own bones. It has the characteristics of good light transmittance, light weight, acid and alkali resistance, easy cleaning, beautiful appearance, etc., and can meet the individual pursuits of different tastes, and is widely used in home design. The main materials of acrylic artificial stone are resin and aluminum hydroxide filler, and the aluminum hydroxide filler plays a role of filler in acrylic artificial stone.

[0003] For acrylic artificial stone with smooth processing, high toughness, high tensile strength, high impact resistance, high flame retardancy, chemical corrosion resistance, pollution resistance, delicate texture, good gloss and bright color, the whiteness, particle size, and oil absorption characteristics of the aluminum hydroxide filler are crucial. Summary of the Invention

[0004] This application provides an aluminum hydroxide composite filler, a preparation method thereof, and an acrylic artificial stone to solve the following technical problems: how to improve the performance of the aluminum hydroxide filler.

[0005] In a first aspect, this application provides an aluminum hydroxide composite filler, and the raw materials of the aluminum hydroxide composite filler include: first aluminum hydroxide and second aluminum hydroxide;

[0006] The median particle size of the first aluminum hydroxide is 5 μm to 15 μm, and the median particle size of the second aluminum hydroxide is 50 μm to 90 μm;

[0007] The weight ratio of the first aluminum hydroxide to the second aluminum hydroxide is (1 to 2):(1 to 3).

[0008] Optionally, the decomposition rate of the first aluminum hydroxide is ≥90%.

[0009] Optionally, the first aluminum hydroxide is prepared by a neutralization method.

[0010] Optionally, the decomposition rate of the second aluminum hydroxide is 40% to 70%.

[0011] Optionally, the second aluminum hydroxide is prepared by a precipitation method.

[0012] Optionally, the aluminum hydroxide composite filler meets the following indicators: median particle diameter is 10 μm to 40 μm, viscosity is 10000 CP to 30000 CP, and oil absorption is 15 ml / 100 g to 25 ml / 100 g.

[0013] In a second aspect, the present application provides a method for preparing the aluminum hydroxide composite filler according to any one of the first aspect, the method comprising:

[0014] obtaining a first aluminum hydroxide and a second aluminum hydroxide;

[0015] mixing the first aluminum hydroxide and the second aluminum hydroxide to obtain an aluminum hydroxide composite filler.

[0016] In a third aspect, the present application provides an acrylic artificial stone, and the raw materials of the acrylic artificial stone include the aluminum hydroxide composite filler according to any one of the first aspect and a resin.

[0017] Optionally, by mass, the aluminum hydroxide composite filler is 50 parts to 70 parts, and the resin is 25 parts to 45 parts.

[0018] Optionally, the resin includes at least one of the following: unsaturated polyester resin, polymethyl methacrylate resin.

[0019] The above technical solutions provided by the embodiments of the present application have the following advantages compared with the prior art:

[0020] The aluminum hydroxide composite filler provided by the embodiment of the present application, the raw materials of the aluminum hydroxide composite filler include: a first aluminum hydroxide and a second aluminum hydroxide; the median particle size of the first aluminum hydroxide is 5 μm to 15 μm, and the median particle size of the second aluminum hydroxide is 50 μm to 90 μm; the compounding of aluminum hydroxide fillers with different particle sizes can enable fine particles to fill the gaps between coarse particles, thereby increasing the bulk density of the aluminum hydroxide composite filler and reducing the viscosity and oil absorption of the aluminum hydroxide composite filler; and the weight ratio of the first aluminum hydroxide to the second aluminum hydroxide is (1 to 3):(1 to 2), which can optimize the particle size distribution, viscosity and oil absorption of the aluminum hydroxide composite filler. In summary, the performance of the aluminum hydroxide filler is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings here are incorporated into the specification and form a part of this specification, showing embodiments consistent with the present application and used together with the specification to explain the principles of the present application.

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, for those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0023] Figure 1 A first aluminum hydroxide prepared by a neutralization method provided by an embodiment of the present application;

[0024] Figure 2 A second aluminum hydroxide prepared by a precipitation method provided by an embodiment of the present application;

[0025] Figure 3 A schematic flow chart of a method for preparing an aluminum hydroxide composite filler provided by an embodiment of the present application. Specific embodiments

[0026] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are some, but not all, of the embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the scope of protection of the present application.

[0027] The various embodiments of the present application may exist in the form of a range; it should be understood that the description in the form of a range is only for convenience and brevity and should not be construed as a rigid limitation on the scope of the present application; therefore, it should be considered that the described range description has specifically disclosed all possible sub-ranges and single values within that range. For example, it should be considered that the range description from 1 to 6 has specifically disclosed sub-ranges such as from 1 to 3, from 1 to 4, from 1 to 5, from 2 to 4, from 2 to 6, from 3 to 6, etc., and single numbers within the range, such as 1, 2, 3, 4, 5, and 6, regardless of the range. Additionally, whenever a numerical range is indicated herein, it means including any cited number (fraction or integer) within the indicated range.

[0028] In this application, unless otherwise stated, the orientation terms such as "upper" and "lower" specifically refer to the drawing directions in the attached drawings. Additionally, in the description of this application's specification, terms such as "include" and "comprise" mean "include but not limited to". In this text, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. In this text, "at least one" means one or more, and "a plurality" means two or more. "At least one kind", "at least one of the following items (pieces)" or similar expressions refer to any combination of these items, including any combination of single items (pieces) or plural items (pieces). For example, "at least one of a, b, or c", or, "at least one of a, b, and c" can both represent: a, b, c, a - b (i.e., a and b), a - c, b - c, or a - b - c, where a, b, and c can be single or multiple respectively. The "mass fraction representation method" such as weight parts and mass parts represents the proportional relationship between each component. In the proportional relationships involved in this text, the parameters that need to be described by proportion should be understood as the antecedents of the proportion formula in the order of description, and the proportional numbers should be understood as the consequents of the proportion formula. For example, if the mass ratio of substance A, substance B, and substance C is 1:2:3, then substance A, substance B, and substance C should correspond one by one with the proportional numbers in the proportion formula in the order of description, that is, the mass of substance A: the mass of substance B: the mass of substance C = 1:2:3.

[0029] Unless otherwise specifically stated, all kinds of raw materials, reagents, instruments, equipment, etc. used in this application can be obtained through market purchase or can be prepared by existing methods.

[0030] In a first aspect, this application provides a composite aluminum hydroxide filler, and the raw materials of the composite aluminum hydroxide filler include: first aluminum hydroxide and second aluminum hydroxide;

[0031] The median particle size of the first aluminum hydroxide is 5 μm to 15 μm, and the median particle size of the second aluminum hydroxide is 50 μm to 90 μm;

[0032] The weight ratio of the first aluminum hydroxide to the second aluminum hydroxide is (1 - 2):(1 - 3).

[0033] In the embodiments of the present application, the median particle size of the first aluminum hydroxide is 5 μm to 15 μm, and the median particle size of the second aluminum hydroxide is 50 μm to 90 μm; the compounding of aluminum hydroxide fillers with different particle sizes can enable fine particles to fill the voids between coarse particles, thereby increasing the bulk density of the aluminum hydroxide composite filler and reducing the viscosity and oil absorption of the aluminum hydroxide composite filler. The first aluminum hydroxide having a smaller particle size means it has a larger specific surface area and relatively fine particles. In application scenarios such as mixing with other substances, it can better fill some tiny voids, showing good filling performance, and may also affect some physical and chemical properties, such as affecting the overall fineness of the composite filler. The second aluminum hydroxide has a relatively high median particle size and is coarser than the first aluminum hydroxide. The coarse particles mainly play a role in constructing the overall framework structure in the composite filler system, providing a certain degree of support and stability, and its own packing method, etc., will also affect the packing characteristics of the entire composite filler. Exemplarily, the median particle size of the first aluminum hydroxide can be 5 μm, 6 μm, 7 μm, 8 μm, 9 μm, 10 μm, 11 μm, 12 μm, 13 μm, 14 μm, 15 μm, etc.; the median particle size of the second aluminum hydroxide can be 50 μm, 55 μm, 60 μm, 65 μm, 70 μm, 75 μm, 80 μm, 85 μm, 90 μm, etc. And the weight ratio of the first aluminum hydroxide to the second aluminum hydroxide is (1 to 2):(1 to 3), which can optimize the particle size distribution, viscosity and oil absorption of the aluminum hydroxide composite filler. If the weight ratio of the first aluminum hydroxide to the second aluminum hydroxide is higher than 2, the proportion of fine particles in the compounding increases, the viscosity and oil absorption of the compounded aluminum hydroxide powder increase, the subsequent production amount of acrylic artificial stone resin increases, and the production cost increases; if the weight ratio of the first aluminum hydroxide to the second aluminum hydroxide is lower than 1 / 3, the proportion of coarse particles in the compounding increases, the viscosity is too low, and the coarse particles settle during the subsequent production of acrylic artificial stone, resulting in warping of the board. Exemplarily, the weight ratio of the first aluminum hydroxide to the second aluminum hydroxide can be 1:1, 1:2, 1:3, 2:1, 2:3, etc.

[0034] Therefore, the embodiments of the present application provide an aluminum hydroxide composite filler, which has the following advantages:

[0035] 1. Void filling effect: When aluminum hydroxides with different particle sizes are compounded, fine particles (the first aluminum hydroxide) can fill the voids between coarse particles (the second aluminum hydroxide). It's like using sand (fine particles) to fill the voids formed by the accumulation of stones (coarse particles), which can make the structure of the entire composite filler more compact, thereby increasing the bulk density of the aluminum hydroxide composite filler.

[0036] 2. Effects on viscosity and oil absorption: By filling the voids of coarse particles with fine particles in this way, the mutual contact and arrangement of filler particles can be optimized. On the one hand, it makes the friction and interaction between particles more orderly when the entire filler system is mixed with other substances (such as matrix materials like resins), thus reducing the viscosity of the aluminum hydroxide composite filler. The lower viscosity helps the filler to be more easily and evenly dispersed in the matrix material during subsequent processing (such as stirring, molding, etc.), facilitating operation and molding. On the other hand, since the voids are filled, the surface area and adsorption sites of the filler in contact with external substances (such as oils) are reasonably adjusted to a certain extent, thereby reducing the oil absorption.

[0037] 3. Controlling the weight ratio of the first aluminum hydroxide to the second aluminum hydroxide enables a relatively reasonable combination of two aluminum hydroxides with different particle sizes in the composite filler. It not only ensures that there are enough fine particles to fill the voids of coarse particles to optimize the structure but also maintains the basic framework constructed by the coarse particles, thus making the particle size distribution of the entire composite filler more uniform and reasonable. A suitable particle size distribution helps to improve the versatility and adaptability of the filler in different application scenarios, such as better playing the filling role in different resin systems. Further regulating the viscosity and oil absorption: In addition to optimizing the particle size distribution, this specific weight ratio can further regulate the viscosity and oil absorption. When the two aluminum hydroxides are mixed in this ratio, they cooperate with each other and act together from multiple aspects such as the quantity and size combination of particles, so that when mixed with other materials, the viscosity of the system can be maintained at an ideal lower level, and the oil absorption can also be effectively controlled, ensuring that the aluminum hydroxide composite filler has good performance.

[0038] Therefore, the above-mentioned compounding of aluminum hydroxides with different particle sizes and reasonable control of their weight ratios optimize the aluminum hydroxide composite filler in terms of multiple key performance indicators such as bulk density, particle size distribution, viscosity, and oil absorption, ultimately achieving the improvement of the performance of the aluminum hydroxide filler.

[0039] In some embodiments, the decomposition rate of the first aluminum hydroxide is ≥90%.

[0040] In some embodiments, the first aluminum hydroxide is prepared by the neutralization method.

[0041] In the embodiment of the present application, the decomposition rate of the first aluminum hydroxide can be ≥90%, which indicates the degree of decomposition of aluminum oxide in the sodium aluminate solution into aluminum hydroxide. Therefore, in the process of decomposing the sodium aluminate solution to generate aluminum hydroxide, at least 90% of the aluminum oxide (in the form of sodium aluminate) participates in the reaction and is converted into the first aluminum hydroxide. The first aluminum hydroxide can be prepared by a neutralization method, achieving a high decomposition rate of the first aluminum hydroxide, so that the first aluminum hydroxide has a distinct hexagonal structure, light is easily refracted, and the whiteness is high, which can reach ≥93%. The high whiteness will improve the coloring power of acrylic artificial stone, and the product has bright colors. Figure 1 A first aluminum hydroxide prepared by a neutralization method is provided in the embodiment of the present application; see Figure 1 It can be seen that aluminum hydroxide with a decomposition rate of ≥90% has an obvious hexagonal prism structure, and more reflective surfaces give it a high whiteness.

[0042] In some embodiments, the decomposition rate of the second aluminum hydroxide is 40% to 70%.

[0043] In some embodiments, the second aluminum hydroxide is prepared by a precipitation method.

[0044] In the embodiment of the present application, the decomposition rate of the second aluminum hydroxide is 40% to 70%. Therefore, in the process of sodium aluminate solution decomposing to generate aluminum hydroxide, 40% to 70% of aluminum oxide (in the form of sodium aluminate) participates in the reaction and is converted into the second aluminum hydroxide. The first aluminum hydroxide can be prepared by a precipitation method, and the moderate decomposition of the second aluminum hydroxide is achieved, so that the second aluminum hydroxide particles are round, the crystal surface is smooth, and the light is less reflected after the incident light, and has better transparency, and the whiteness can reach ≥90%, so that the acrylic artificial stone has a jade texture. Figure 2 A second aluminum hydroxide prepared by a precipitation method is provided in the embodiment of the present application; see Figure 2 It can be seen that aluminum hydroxide with a decomposition rate of 40% to 70% has a high density and the rounded surface of the particles gives it good transparency.

[0045] Therefore, the two types of aluminum hydroxide can be compounded to obtain aluminum hydroxide with high whiteness and good transparency. The acrylic artificial stone made from the compounded aluminum hydroxide has good coloring power and jade texture.

[0046] In some embodiments, the aluminum hydroxide composite filler meets the following indicators: a median particle size of 10 μm to 40 μm, a viscosity of 10,000 CP to 30,000 CP, and an oil absorption of 15 ml / 100 g to 25 ml / 100 g.

[0047] In the embodiments of the present application, the above-mentioned aluminum hydroxide composite filler has excellent performance indicators, with characteristics of low proportion of fine particles, low oil absorption, and low viscosity, meeting the requirements of a median particle size of 10 μm to 40 μm, a viscosity of 10,000 CP to 30,000 CP, and an oil absorption of 15 ml / 100 g to 25 ml / 100 g.

[0048] Second, the present application provides a preparation method for the aluminum hydroxide composite filler according to any one of the first aspects. Figure 3 It is a schematic flow chart of a preparation method for an aluminum hydroxide composite filler provided by an embodiment of the present application; please refer to Figure 3 The method includes:

[0049] S1. Obtain the first aluminum hydroxide and the second aluminum hydroxide;

[0050] S2. Mix the first aluminum hydroxide and the second aluminum hydroxide to obtain an aluminum hydroxide composite filler.

[0051] In the embodiments of the present application, the first aluminum hydroxide and the second aluminum hydroxide with different decomposition rates are selected; the first aluminum hydroxide needs to be obtained by mechanically grinding and pulverizing the aluminum hydroxide raw material, effectively controlling the number of thick and fine particles in the aluminum hydroxide composite filler, thereby reducing the viscosity and oil absorption of the aluminum hydroxide composite filler.

[0052] The preparation method of this aluminum hydroxide composite filler is realized based on the above-mentioned aluminum hydroxide composite filler. The specific raw material composition of this aluminum hydroxide composite filler can refer to the above embodiments. Since the preparation method of this aluminum hydroxide composite filler adopts some or all of the technical solutions of the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, and will not be elaborated here one by one.

[0053] Third, the present application provides an acrylic artificial stone, and the raw materials of the acrylic artificial stone include the aluminum hydroxide composite filler according to any one of the first aspects and a resin.

[0054] In some embodiments, by mass, the aluminum hydroxide composite filler is 50 parts to 70 parts, and the resin is 25 parts to 45 parts.

[0055] In some embodiments, the resin includes at least one of the following: unsaturated polyester resin, polymethyl methacrylate resin (PMMA resin).

[0056] In the embodiments of the present application, acrylic artificial stone is a kind of artificial stone, and its main components are resin and aluminum hydroxide filler. Acrylic artificial stone has excellent appearance, moderate hardness and good chemical corrosion resistance. It is suitable for kitchen countertops, bathroom countertops and wash basins, as well as interior decoration boards. Among them, the function of the resin: the matrix material of the artificial stone, and the function of the aluminum hydroxide filler: as a filler and a flame retardant, playing the roles of filling and flame retardant, which can effectively reduce the production cost of the artificial stone. The raw materials of the acrylic artificial stone include the above-mentioned aluminum hydroxide composite filler and resin. The above-mentioned aluminum hydroxide filler has both whiteness and transparency, and the acrylic artificial stone produced by mixing with PMMA resin has good coloring power and jade texture. The above-mentioned aluminum hydroxide composite filler can be 50 parts to 70 parts, and the resin can be 25 parts to 45 parts. The aluminum hydroxide composite filler has low viscosity and low oil absorption, and can reduce the resin addition amount in the acrylic artificial stone by 10-20%, reducing the production cost of the acrylic artificial stone. The performance indicators of the acrylic artificial stone meet the national standard JC / T 908--2013. The raw materials of the acrylic artificial stone can also include: 1 part to 2 parts of curing agent, 0.5 part to 1 part of accelerator. Exemplarily, the aluminum hydroxide filler can be 50 parts, 53 parts, 55 parts, 58 parts, 60 parts, 63 parts, 65 parts, 68 parts, 70 parts, etc.; the resin can be 25 parts, 28 parts, 30 parts, 33 parts, 35 parts, 38 parts, 40 parts, 43 parts, 45 parts, etc. The resin can be one or a combination of two of unsaturated polyester resin (UPR) and polymethyl methacrylate resin (PMMA). The preparation method of the acrylic artificial stone includes: raw material batching - vacuum stirring - discharging into the mold - vibrating to remove bubbles - curing at natural temperature or heating and curing. The raw materials of the above-mentioned acrylic artificial stone can also include pigments, initiators and accelerators; among them, the pigment can be 1 part to 3 parts, the initiator can be 0.5 part to 2 parts, and the accelerator can be 0.1 part to 0.5 part.

[0057] The acrylic artificial stone is realized based on the above-mentioned aluminum hydroxide composite filler. The specific raw material composition of the aluminum hydroxide composite filler can refer to the above embodiments. Since the acrylic artificial stone adopts some or all of the technical solutions of the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be elaborated one by one here.

[0058] The following will further illustrate the present application in combination with specific embodiments. It should be understood that these embodiments are only used to illustrate the present application and not to limit the scope of the present application. The experimental methods without specific conditions in the following embodiments are usually determined according to national standards. If there is no corresponding national standard, they are carried out according to general international standards, conventional conditions or conditions recommended by the manufacturer.

[0059] Example 1

[0060] A kind of aluminum hydroxide composite filler, the raw materials of the aluminum hydroxide composite filler include: the first aluminum hydroxide (neutralization method) and the second aluminum hydroxide (precipitation method);

[0061] The median particle size d50 of the first aluminum hydroxide is 6.5μm, the specific surface area is 1.09m 2 / g, the decomposition rate is 91.3%, and the whiteness is 94%;

[0062] The median particle size of the second aluminum hydroxide is 70μm, the decomposition rate is 59.8%, and the whiteness is 91%;

[0063] The weight ratio of the first aluminum hydroxide to the second aluminum hydroxide is 1:1.5.

[0064] The performance indexes of the aluminum hydroxide composite filler meet: d50 23.6μm, +325 mesh 70.2%, viscosity 12000CP, oil absorption 18ml / 100g.

[0065] A preparation method of the aluminum hydroxide composite filler, including:

[0066] (1) Take the aluminum hydroxide raw material with a median particle size d50 of 89μm and a whiteness of 94%, and after mechanical grinding and pulverization, obtain the first aluminum hydroxide with a median particle size d50 of 6.5μm and a specific surface area of 1.09m 2 / g;

[0067] (2) Take the second aluminum hydroxide with a median particle size d50 of 70μm and a whiteness of 91%;

[0068] (3) Mix and compound the first aluminum hydroxide and the second aluminum hydroxide at a weight ratio of 1:1.5 to obtain the aluminum hydroxide composite filler.

[0069] An acrylic artificial stone is obtained by mixing the aluminum hydroxide composite filler and PMMA resin. Among them, the aluminum hydroxide composite filler is 58 parts, PMMA resin is 38 parts, pigment yellow 139 is 3 parts, the initiator is cyclohexanone peroxide 0.5 part, and the accelerator is cobalt isooctanoate 0.5 part.

[0070] For the indexes of the acrylic artificial stone provided in this Example 1, please refer to Table 1.

[0071] Table 1 Indexes of the acrylic artificial stone provided in Example 1

[0072] Barcol hardness Tensile strength, MPa Flexural strength, MPa Impact strength, KJ / M2 Stain resistance index Curing time, min 68 41 55 6 61 8

[0073] Example 2

[0074] A kind of aluminum hydroxide composite filler, the raw materials of the aluminum hydroxide composite filler include: the first aluminum hydroxide (neutralization method) and the second aluminum hydroxide (precipitation method);

[0075] The median particle size d50 of the first aluminum hydroxide is 9.2 μm, the specific surface area is 0.89 m 2 / g, the decomposition rate is 90.7%, and the whiteness is 94%;

[0076] The median particle size of the second aluminum hydroxide is 70 μm, the decomposition rate is 59.8%, and the whiteness is 91%;

[0077] The weight ratio of the first aluminum hydroxide to the second aluminum hydroxide is 1:1.2.

[0078] The performance indicators of the aluminum hydroxide composite filler meet: d50 21.6 μm, +325 mesh 63.8%, viscosity 13500 CP, oil absorption 18 ml / 100 g.

[0079] A preparation method of an aluminum hydroxide composite filler includes:

[0080] (1) Take the aluminum hydroxide raw material with a median particle size d50 of 89 μm and a whiteness of 94%. After mechanical grinding and pulverization, the first aluminum hydroxide raw material 3 is obtained, with a median particle size d50 of 9.2 μm and a specific surface area of 0.89 m 2 ;

[0081] (2) Take the second aluminum hydroxide with a median particle size d50 of 70 μm and a whiteness of 91%;

[0082] (3) Mix and compound the first aluminum hydroxide and the second aluminum hydroxide at a weight ratio of 1:1.2 to obtain the aluminum hydroxide composite filler.

[0083] An acrylic artificial stone is obtained by mixing an aluminum hydroxide composite filler and a PMMA resin. Among them, the aluminum hydroxide composite filler is 55 parts, the PMMA resin is 42 parts, pigment yellow 139 is 2 parts, the initiator is cyclohexanone peroxide 0.5 part, and the accelerator is cobalt isooctanoate 0.5 part.

[0084] For the indicators of the acrylic artificial stone provided in this Example 2, please refer to Table 2.

[0085] Table 2 Indicators of the acrylic artificial stone provided in Example 2

[0086]

[0087] Example 3

[0088] An aluminum hydroxide composite filler, the raw materials of the aluminum hydroxide composite filler include: the first aluminum hydroxide (neutralization method) and the second aluminum hydroxide (precipitation method);

[0089] The median particle size d50 of the first aluminum hydroxide is 11.7 μm, the specific surface area is 0.77 m 2 / g, the decomposition rate is 91.3%, and the whiteness is 94%;

[0090] The median particle size of the second aluminum hydroxide is 70 μm, the decomposition rate is 59.8%, and the whiteness is 91%;

[0091] The weight ratio of the first aluminum hydroxide to the second aluminum hydroxide is 1:1.1.

[0092] The performance indicators of the aluminum hydroxide composite filler meet: d50 16.6 μm, +325 mesh 55.7%, viscosity 15800 CP, oil absorption 19 ml / 100 g.

[0093] A preparation method of an aluminum hydroxide composite filler, comprising:

[0094] (1) Take an aluminum hydroxide raw material with a median particle size d50 of 89 μm and a whiteness of 94%, and obtain the first aluminum hydroxide through mechanical grinding and pulverization, with a median particle size d50 of 11.7 μm and a specific surface area of 0.77 m 2 / g;

[0095] (2) Take the second aluminum hydroxide with a median particle size d50 of 70 μm and a whiteness of 91%;

[0096] (3) Mix and compound the first aluminum hydroxide and the second aluminum hydroxide at a weight ratio of 1:1.1 to obtain the aluminum hydroxide composite filler.

[0097] An acrylic artificial stone is obtained by mixing an aluminum hydroxide composite filler and a PMMA resin. Among them, there are 50 parts of the aluminum hydroxide composite filler, 45 parts of the PMMA resin, 3 parts of pigment yellow 139, 1 part of the initiator cyclohexanone peroxide, and 0.5 part of the accelerator cobalt isooctanoate.

[0098] For the indicators of the acrylic artificial stone provided in this Example 3, please refer to Table 3.

[0099] Table 3 Indicators of the acrylic artificial stone provided in Example 3

[0100]

[0101] Comparative Example 1

[0102] Based on the disclosed content of Example 1, the difference between Comparative Example 1 and Example 1 is that: the weight ratio of the first aluminum hydroxide to the second aluminum hydroxide is 3:1;

[0103] The performance indicators of the aluminum hydroxide composite filler meet: d50 12.5 μm, +325 mesh 40.6%, viscosity 32000 CP, oil absorption 27 ml / 100 g.

[0104] For the indicators of the acrylic artificial stone provided in this Comparative Example 1, please refer to Table 4.

[0105] Table 4 Indexes of the acrylic artificial stone provided by Comparative Example 1

[0106]

[0107] The aluminum hydroxide composite fillers provided by Examples 1 to 3 have excellent performance indexes, with characteristics of low proportion of fine particles, low oil absorption and low viscosity. Therefore, when used to prepare acrylic artificial stone, the content of PMMA resin can be reduced, and the production cost of acrylic artificial stone is reduced.

[0108] One or more technical solutions in the embodiments of the present application at least further have the following technical effects or advantages:

[0109] (1) In the embodiments of the present application, by preferably selecting aluminum hydroxide raw materials with two different synthesis methods, choosing a suitable crushing method to reduce the content of fine particles in one of the aluminum hydroxide raw materials, and preferably selecting suitable compounding conditions, an aluminum hydroxide filler suitable for PMMA resin with a low proportion of fine particles (more than 50% for +325 mesh), low oil absorption and low viscosity is prepared. The obtained aluminum hydroxide composite filler is mixed with PMMA resin to produce acrylic artificial stone with jade texture, toughness, tensile strength, impact resistance, flame retardancy, chemical corrosion resistance and pollution resistance.

[0110] (2) The aluminum hydroxide composite filler provided by the embodiments of the present application has both whiteness and transparency, and the acrylic artificial stone produced by mixing with PMMA resin has good coloring power and jade texture.

[0111] (3) The aluminum hydroxide composite filler provided by the embodiments of the present application has few fine particles, and the curing time of the acrylic artificial stone produced by mixing with PMMA resin is ≤ 10 min, ensuring the production efficiency of acrylic artificial stone.

[0112] (4) The aluminum hydroxide composite filler provided by the embodiments of the present application has low viscosity and low oil absorption. The addition amount of PMMA resin in acrylic artificial stone can be reduced by 10% - 20%. Since the price of PMMA resin is much higher than that of aluminum hydroxide filler, the compounded aluminum hydroxide of the present invention reduces the production cost of acrylic artificial stone, and at the same time improves the Barcol hardness, tensile strength, flexural strength, impact strength and curing time of acrylic artificial stone.

[0113] The above are only specific implementation manners of the present application, enabling those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be obvious to those skilled in the art. The general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to these embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features claimed herein.

Claims

1. An aluminum hydroxide composite filler, the raw materials of the aluminum hydroxide composite filler comprising: a first aluminum hydroxide and a second aluminum hydroxide; The median particle size of the first aluminum hydroxide is 5 μm to 15 μm, and the median particle size of the second aluminum hydroxide is 50 μm to 90 μm; The weight ratio of the first aluminum hydroxide to the second aluminum hydroxide is (1-2):(1-3).

2. The aluminum hydroxide composite filler according to claim 1, characterized in that The decomposition rate of the first aluminum hydroxide is ≥90%.

3. The aluminum hydroxide composite filler according to claim 1 or 2, characterized in that: The first aluminum hydroxide is prepared by a neutralization method.

4. The aluminum hydroxide composite filler according to claim 1, characterized in that The decomposition rate of the second aluminum hydroxide is 40% to 70%.

5. The aluminum hydroxide composite filler according to claim 1 or 4, characterized in that: The second aluminum hydroxide is prepared by a precipitation method.

6. The aluminum hydroxide composite filler according to claim 1, characterized in that: The aluminum hydroxide composite filler meets the following indicators: a median particle size of 10 μm to 40 μm, a viscosity of 10,000 CP to 30,000 CP, and an oil absorption of 15 ml / 100 g to 25 ml / 100 g.

7. A method for preparing the aluminum hydroxide composite filler according to any one of claims 1 to 6, the method comprising: Obtaining a first aluminum hydroxide and a second aluminum hydroxide; The first aluminum hydroxide and the second aluminum hydroxide are mixed to obtain an aluminum hydroxide composite filler.

8. An acrylic artificial stone, wherein the raw materials of the acrylic artificial stone include the aluminum hydroxide composite filler according to any one of claims 1 to 6 and a resin.

9. The acrylic artificial stone according to claim 8, characterized in that: In parts by mass, the aluminum hydroxide composite filler is 50 parts to 70 parts, and the resin is 25 parts to 45 parts.

10. The acrylic artificial stone according to claim 8 or 9, characterized in that: The resin includes at least one of the following: unsaturated polyester resin and polymethyl methacrylate resin.

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