阅读说明：本技术 一种薄荷改性石英石及其制备方法 (Mint modified quartz stone and preparation method thereof ) 是由 黄效华 唐宇欣 姜吉术 杨继奎 黄效谦 刘新文 于 2020-08-08 设计创作，主要内容包括：本发明提供一种薄荷改性石英石及其制备方法,包括碳化硅预处理、薄荷改性材料制备、平衡、混料、混压、固化；所述薄荷改性材料制备,包括薄荷提取物制备、改性材料制备。制得的薄荷改性石英石,抗菌效果好,有效减少使用过程中的细菌交叉污染,有效减少疾病传播；抗菌稳定性好,长期抗菌性突出；耐污染性能佳；力学性能、耐高温性好。(The invention provides mint modified quartz stone and a preparation method thereof, wherein the preparation method comprises the steps of silicon carbide pretreatment, mint modified material preparation, balance, material mixing, mixed pressing and solidification; the preparation of the mint modified material comprises the preparation of a mint extract and the preparation of the modified material. The prepared mint modified quartz stone has a good antibacterial effect, so that the bacterial cross contamination in the using process is effectively reduced, and the disease transmission is effectively reduced; the antibacterial stability is good, and the long-term antibacterial property is outstanding; the pollution resistance is good; good mechanical property and high temperature resistance.)

1. A preparation method of mint modified quartz stone is characterized by comprising the following steps: comprises the steps of silicon carbide pretreatment, mint modified material preparation, balance, material mixing, mixed pressing and solidification;

the preparation of the mint modified material comprises the preparation of a mint extract and the preparation of the modified material;

preparing the mint extract, namely heating and dry distilling mint leaves in stages under a vacuum condition, collecting the dry distillation distillate and distilling, wherein the distillation light component condensate is the mint extract;

and (3) preparing the modified material, namely performing acid treatment on the molecular nest particles, washing to be neutral, drying, and uniformly mixing with the mint extract to obtain the mint modified material.

2. The method for preparing mint-modified quartz stone according to claim 1, wherein the method comprises the following steps: the silicon carbide pretreatment comprises crushing, pretreatment and aftertreatment;

and the pretreatment, namely putting the silicon carbide particles into 0.5mol/L sodium hydroxide solution, stirring and filtering, spray rinsing the silicon carbide ceramic particles by adopting 0.05mol/L sodium hexametaphosphate solution, and filtering the silicon carbide ceramic particles.

3. The method for preparing mint-modified quartz stone according to claim 2, wherein the method comprises the following steps: the post-treatment comprises the steps of mixing the silicon carbide ceramic with potassium titanate fiber and hydroxypropyl methyl cellulose, heating to 60-65 ℃, stirring at the rotating speed of 30RPM, and stirring for 30 min; and (3) increasing the stirring speed to 400-600 RPM, stirring for 60-80 min, performing filter pressing, and drying at the low temperature of 80-85 ℃ to obtain the pretreated silicon carbide particles.

4. The method for preparing mint-modified quartz stone according to claim 1, wherein the method comprises the following steps: the segmented temperature rise dry distillation is dry distillation at two ends;

the first-stage dry distillation temperature is 130-140 ℃, and the dry distillation time is 1-1.5 h;

the second-stage dry distillation temperature is 200-220 ℃, and the dry distillation time is 1.5 h.

5. The method for preparing mint-modified quartz stone according to claim 1, wherein the method comprises the following steps: the molecular nest particles are porous material carriers with the particle size of less than or equal to 10 mu m;

the porous material carrier is at least one of the following: shell powder, diatomite, polytetrafluoroethylene particles, polychlorotrifluoroethylene particles, silica gel particles, activated carbon particles, silica particles and natural clay.

6. The method for preparing mint-modified quartz stone according to claim 1, wherein the method comprises the following steps: and (3) mixing the mint modified material with o-benzene type unsaturated polyester resin and wood fiber under the balanced and vacuum conditions, stirring, and standing and balancing for 12 hours.

7. The method for preparing mint-modified quartz stone according to claim 1, wherein the method comprises the following steps: and mixing materials, namely sequentially adding quartz sand, silicon carbide particles, an organosilane coupling agent and a curing agent tert-butyl peroxybenzoate into the balanced material mixture, and uniformly mixing to obtain a mixed material.

8. The method for preparing mint-modified quartz stone according to claim 1, wherein the method comprises the following steps: the raw materials added in the mixing process comprise the following components in parts by weight: 8-12 parts of o-benzene unsaturated polyester resin, 7-10 parts of mint modified material, 2-3 parts of wood fiber, 50-55 parts of quartz sand, 20-25 parts of silicon carbide particles, 2-3 parts of organosilane coupling agent and 2-3 parts of curing agent tert-butyl peroxybenzoate.

9. The method for preparing mint-modified quartz stone according to claim 1, wherein the method comprises the following steps: the mixed pressing comprises primary pressing and secondary pressing;

the primary pressing is to carry out vibration forming pressing on the mixed material, heat the mixed material to 70 ℃ under a vacuum condition, control the vibration frequency to be 60Hz, control the static pressure to be 40-45 kg, press time to be 8-10 min, and naturally cool the mixed material to normal temperature after pressing;

and in the secondary pressing, the material subjected to the primary pressing is subjected to vibration forming pressing, the vibration frequency is 80Hz, the static pressure is controlled to be 55-60 kg, and the pressing time is 3-5 min under the vacuum condition.

10. A mint modified quartz stone is characterized in that: the mint-modified quartz stone preparation method according to claims 1 to 9.

Technical Field

The invention relates to the field of quartz stone, in particular to mint modified quartz stone and a preparation method thereof.

Background

The quartz stone is a new stone material synthesized by more than 90% of quartz crystal, resin and other trace elements. It is a large-scale plate pressed by a special machine under certain physical and chemical conditions, and the main material of the large-scale plate is quartz. Quartz is a mineral that easily becomes liquid when heated or pressurized. It is also a very common rock-making mineral, and is found in three major types of rocks. Because it crystallizes the latest in igneous rocks, it usually lacks complete crystal planes, mostly filling in the middle of other previously crystallized petrochemicals. The composition of quartz is silicon dioxide.

As a latest artificial building material, the artificial quartz stone has the incomparable advantages of high strength, high hardness, high temperature resistance, corrosion resistance, ageing resistance, easy cleaning, wear resistance, pure material, no radiation and the like compared with natural stone. In the present day that natural stone is gradually exhausted as non-renewable resources, artificial quartz is the best substitute, and meanwhile, the artificial quartz can adopt waste glass as a raw material, so that the resource recycling is realized while the environment is protected, and the advantages enable the artificial quartz to become a new and expensive building decoration industry and to be widely applied to the ground and wall decoration and home industries of cabinets, bathrooms, offices and large markets. The plate has compact texture, low water absorption, good oil stain resistance, better acid and alkali resistance and chemical corrosion resistance, and is quite popular with people.

The antibacterial and environment-friendly property is a hot trend in the field of household materials, and in the prior art, inorganic or organic antibacterial agents are usually added into an original base material so as to enable the material to have antibacterial performance to a certain degree. The applicant researches and discovers that in the prior art, in the process of adding an inorganic or organic antibacterial agent into a quartz stone material and processing the quartz stone material into a plate, the antibacterial agent is easily influenced by the process or other raw materials and is easily oxidized or denatured, so that the antibacterial property of the quartz stone material is reduced or lost; meanwhile, the antibacterial quartz stone plate has poor stability and long-term antibacterial property in the daily long-term use process; furthermore, the antibacterial agent in the quartz stone plate fails to work, so that the hardness of the plate is reduced, and the pollution resistance is reduced.

Chinese patent CN107892505A discloses an organic long-acting antibacterial quartz stone, which is prepared by adding alkyl quaternary phosphonium salt organic antibacterial agent into quartz stone plate to realize antibacterial property of quartz stone plate. However, in the process of processing unsaturated polyester resin as raw material by adopting alkyl quaternary phosphonium salt organic antibacterial agent, the alkyl quaternary phosphonium salt organic antibacterial agent is easily influenced by the process, and the long-term antibacterial performance is not ideal.

Disclosure of Invention

In order to solve the technical problems in the prior art, the invention provides mint modified quartz stone and a preparation method thereof, aiming at overcoming the defects that inorganic or organic antibacterial agents added into antibacterial quartz stone plates are easily influenced by processes or other raw materials and reduce or lose the antibacterial performance of the antibacterial quartz stone plates in the prior art; and the long-term antibacterial property of the quartz stone plate is improved.

In order to solve the technical problems, the technical scheme adopted by the invention is as follows:

a mint modified quartz stone and a preparation method thereof comprise silicon carbide pretreatment, mint modified material preparation, balance, material mixing, mixed pressing and solidification.

The silicon carbide pretreatment comprises crushing, pretreatment and aftertreatment.

And (3) crushing the silicon carbide to the particle size of 0.15-0.2 mm by a dry method to obtain silicon carbide particles.

And in the pretreatment, the silicon carbide particles are put into 0.5mol/L sodium hydroxide solution with the volume 3 times of that of the silicon carbide particles, the stirring speed is 200-220 RPM, the filtering is carried out after the stirring time is 30-40 min, the silicon carbide ceramic particles are sprayed and leached by adopting 0.05mol/L sodium hexametaphosphate solution, the spraying and leaching flow rate of the sodium hexametaphosphate solution is 50ml/min, the spraying and leaching time is 10-12 min, and the silicon carbide ceramic particles are filtered.

The total amount of the sodium hexametaphosphate solution is 5-10 times of the volume of the silicon carbide ceramic particles.

And (3) performing post-treatment, namely mixing the silicon carbide ceramic with potassium titanate fiber and hydroxypropyl methyl cellulose, heating to 60-65 ℃, stirring at the rotating speed of 30RPM, stirring for 30min, increasing the stirring at the rotating speed of 400-600 RPM, stirring for 60-80 min, performing filter pressing, and drying at the low temperature of 80-85 ℃ to obtain the pretreated silicon carbide particles.

The silicon carbide particles: potassium titanate fiber: the hydroxypropyl methyl cellulose has a weight part ratio of 1 (0.07-0.09): (0.02-0.04).

The potassium titanate fiber has a fiber length of 25 to 30 μm and a diameter of 0.2 to 0.3 μm.

The preparation of the mint modified material comprises the preparation of a mint extract and the preparation of the modified material.

Preparing the mint extract, namely heating fresh mint leaves to 130-140 ℃ under a vacuum condition for dry distillation, keeping the temperature for 1-1.5 h, then quickly heating to 200-220 ℃, and keeping the temperature for 1.5 h; collecting distillate, standing for 24 hr, and siphoning to obtain clear liquid; and distilling the clear liquid at 125-130 ℃, and collecting condensate of distilled light components to obtain the mint extract.

Preparing the modified material, namely putting molecular nest particles with the particle size of 8-10 mu m into sulfuric acid with the volume of 3 times, heating to 50-60 ℃, and ultrasonically dispersing for 15-20 min; filtering the molecular nest particles, washing the molecular nest particles to be neutral by using enough deionized water, and drying the molecular nest particles at 130-160 ℃ until the moisture content is less than 5 ppm; the concentration of the sulfuric acid is 36%.

And mixing the dried molecular nest particles with 1.5 times of the volume of the mint extract, and stirring at the rotating speed of 60-80 RPM for 60min to obtain the mint modified material.

The molecular nest particles are porous materials with the particle size of less than or equal to 10 mu m; the molecular nest particle may be: porous material carriers such as shell powder, diatomite, polytetrafluoroethylene particles, polychlorotrifluoroethylene particles, alumina particles, silica gel particles, activated carbon particles, silica particles and natural clay.

And (3) mixing the mint modified material with o-benzene type unsaturated polyester resin and wood fiber under the balance and vacuum conditions, stirring at 20-30 RPM for 30min, and standing and balancing for 12 hours.

And mixing materials, namely sequentially adding quartz sand, silicon carbide particles, an organosilane coupling agent and a curing agent tert-butyl peroxybenzoate into the balanced material mixture, and uniformly mixing to obtain a mixed material.

The quartz sand is mixed in equal volume with the grain size of 30-60 meshes and the grain size of 80-100 meshes.

The o-benzene type unsaturated polyester resin has the viscosity of 0.9-1.2 Pa.S.

The raw materials comprise the following components in parts by weight: 8-12 parts of o-benzene unsaturated polyester resin, 7-10 parts of mint modified material, 2-3 parts of wood fiber, 50-55 parts of quartz sand, 20-25 parts of silicon carbide particles, 2-3 parts of organosilane coupling agent and 2-3 parts of curing agent tert-butyl peroxybenzoate.

And the mixing and pressing comprises primary pressing and secondary pressing.

The primary pressing is carried out, the mixed material is placed into a vacuum vibration forming press, the mixed material is heated to 70 ℃ under the vacuum condition, the vibration frequency is 60Hz, the static pressure is controlled to be 40-45 kg, the pressing time is 8-10 min, and the mixed material is naturally cooled to the normal temperature after being pressed;

and (3) performing secondary pressing, wherein the vibration frequency is 80Hz, the static pressure is controlled to be 55-60 kg, and the pressing time is 3-5 min under the vacuum condition.

And (3) after the solidification and the pressing are finished, solidifying at the temperature of 130-140 ℃, and after the solidification time is 20min, demoulding and cooling to obtain the mint modified quartz stone.

Compared with the prior art, the invention has the beneficial effects that:

(1) the mint modified quartz stone has a good antibacterial effect, has an antibacterial rate of 89-96% for common staphylococcus aureus, escherichia coli and candida albicans, can be used in table tops of kitchens and tea tables, can effectively resist bacteria, effectively reduce bacterial cross contamination in the using process and effectively reduce disease propagation;

(2) the mint modified quartz stone has good antibacterial stability and outstanding long-term antibacterial property, and the antibacterial attenuation rate is less than 0.05 percent in daily long-term use;

(3) the mint modified quartz stone has the pollution resistance grade of 1, and has no pollution and dyeing traces after being dripped on the surface of the quartz stone by ink, red wine, concentrated tea, edible oil, soy sauce, lipstick, fruit juice and the like and is kept stand for 100 hours and dried;

(4) the mint modified quartz stone has the Mohs hardness of 8-8.5 grade and the wear resistance of 2.2x10^-3g/cm²The durability of the daily household is outstanding;

(5) the mint modified quartz stone has the compression strength of 177-182 MPa and the bending strength of 42-50 MPa;

(6) according to the mint modified quartz stone, the burning cigarettes are placed on the surface of the quartz stone, hot stamping traces do not exist on the surface, and the mint modified quartz stone is good in high-temperature resistance.

Detailed Description

In order to more clearly understand the technical features, objects, and effects of the present invention, specific embodiments of the present invention will now be described.