阅读说明：本技术 一种低膨胀系数的石英石板材及其制备方法 (Quartz stone plate with low expansion coefficient and preparation method thereof ) 是由 姚军龙 胡涵超 陈思 祁耀斌 严立明 朱海祥 弯琳 于 2021-02-03 设计创作，主要内容包括：本发明公开了一种低膨胀系数的石英石板材及其制备方法,属于人造石英石板技术领域。由以下重量份的原料制成：双酚A环氧树脂80-130份、抗氧剂3010 2-7份、光稳定剂770 1-5份、偶联剂KH570 0.5-2份、固化剂0.4-1份和石英粉750-1050份。加入少量的抗氧剂,对石英石板材的热膨胀系数基本无影响,但会降低石英石板材的力学性能；而加入大量的抗氧剂,虽然能明显降低石英石板材的热膨胀系数,但会显著降低石英石板材的力学性能,并不能应用于产品中。然而,申请人发现光稳定剂能在抗氧剂的存在下改善石英石板材的力学性能,即在一定比例的抗氧剂和光稳定剂下,能实现热膨胀系数与力学性能的完美平衡。(The invention discloses a quartz stone plate with a low expansion coefficient and a preparation method thereof, belonging to the technical field of artificial quartz stone plates. The feed is prepared from the following raw materials in parts by weight: 80-130 parts of bisphenol A epoxy resin, 30102-7 parts of antioxidant, 7701-5 parts of light stabilizer, 2-2 parts of coupling agent KH 5700.5, 0.4-1 part of curing agent and 1050 parts of quartz powder 750-. A small amount of antioxidant is added, so that the thermal expansion coefficient of the quartz stone plate is basically not influenced, but the mechanical property of the quartz stone plate is reduced; and a large amount of antioxidant is added, so that although the thermal expansion coefficient of the quartz stone plate can be obviously reduced, the mechanical property of the quartz stone plate can be obviously reduced, and the quartz stone plate cannot be applied to products. However, the applicant found that the light stabilizer can improve the mechanical properties of the quartz stone plate in the presence of the antioxidant, namely, the perfect balance between the thermal expansion coefficient and the mechanical properties can be realized under a certain proportion of the antioxidant and the light stabilizer.)

1. The quartz stone plate with the low expansion coefficient is characterized by being prepared from the following raw materials in parts by weight: 80-130 parts of bisphenol A epoxy resin, 30102-7 parts of antioxidant, 7701-5 parts of light stabilizer, 2-2 parts of coupling agent KH 5700.5, 0.4-1 part of curing agent and 1050 parts of quartz powder 750-.

2. The low expansion coefficient quartz stone slab as claimed in claim 1, wherein the particle size of the quartz powder is 10-500 μm.

3. The low expansion quartz stone slab of claim 1, wherein the curing agent is OT curing agent.

4. The low expansion coefficient quartz stone plate as claimed in claim 1, characterized by being prepared from the following raw materials in parts by weight: 100 parts of bisphenol A epoxy resin, 30105 parts of antioxidant, 7703 parts of light stabilizer, KH 5701.2 parts of coupling agent, 0.7 part of OT curing agent and 900 parts of quartz powder.

5. A method of producing a low coefficient of expansion quartz stone slab as claimed in any one of claims 1 to 4, characterized in that it comprises the following steps:

(1) uniformly stirring and mixing the bisphenol A epoxy resin, the antioxidant, the light stabilizer, the coupling agent and the curing agent according to the proportion to obtain a mixture;

(2) uniformly stirring the mixture and quartz powder according to the proportion to obtain a raw material;

(3) carrying out vibration pressing molding on the raw materials in a mold;

(4) and curing and molding the demoulded plate at 80-90 ℃ for 1.5-3.5 hours, and standing at room temperature for 60-84 hours after cooling to obtain the product.

6. The production method according to claim 5, wherein in the step (1), stirring is carried out at room temperature for 20 to 45 minutes; in step (2), stirring is carried out at room temperature for 20 to 40 minutes.

7. The method according to claim 5, wherein in the step (3), the vacuum pressure is-0.09 MPa and the compacting time is 50-75 seconds.

Technical Field

The invention belongs to the technical field of artificial quartz stone plates, and particularly relates to a quartz stone plate with a low expansion coefficient and a preparation method thereof.

Background

The artificial stone is a resin-based composite material composed of inorganic phases such as quartz stone, granite and glass and organic phases such as unsaturated resin, and is reversely and quickly an important direction for the development of the stone industry at present due to the advantages of wide manufacturing raw materials, low production cost, convenient processing and installation, various appearance varieties, health, environmental protection and the like under the situation that the overall development of the stone industry in China is gradually slowed down. However, due to the characteristics of the resin-based composite material, the volume of the resin-based composite material can expand and contract along with the temperature change of the environment, the resin-based composite material is used as a stone in the integral structure of a building material, the environmental temperature fluctuates for a long time, and the dimensional change under the condition can easily cause the damage of the integral structure of the building, thereby causing serious safety accidents.

Disclosure of Invention

The applicant has creatively found that specific antioxidants improve the thermal expansion coefficient of quartz stone slabs; if a small amount of specific antioxidant is added, the thermal expansion coefficient of the quartz stone plate is basically not influenced, but the mechanical property of the quartz stone plate is reduced; if a large amount of specific antioxidant is added, although the thermal expansion coefficient of the quartz stone plate can be obviously reduced, the mechanical property of the quartz stone plate can be obviously reduced, and the quartz stone plate cannot be applied to products. However, the applicant finds that the specific light stabilizer (which is added alone and cannot change the thermal expansion coefficient and the mechanical property of the quartz stone plate) can improve the mechanical property of the quartz stone plate in the presence of the specific antioxidant, that is, under the condition that the mechanical property is kept basically unchanged in a certain proportion of the specific antioxidant and the specific light stabilizer, the thermal expansion coefficient can be reduced remarkably, and the perfect balance between the mechanical property and the low expansion coefficient is achieved. The technical scheme is as follows:

on one hand, the embodiment of the invention provides a quartz stone plate with a low expansion coefficient, which is prepared from the following raw materials in parts by weight: 80-130 parts of bisphenol A epoxy resin, 30102-7 parts of antioxidant, 7701-5 parts of light stabilizer, 2-2 parts of coupling agent KH 5700.5, 0.4-1 part of curing agent and 1050 parts of quartz powder 750-. Of course, other components such as coloring materials and the like may be added as necessary.

The particle size of the quartz powder in the embodiment of the invention is 10-500 microns, and grading is carried out according to actual needs.

The curing agent in the embodiment of the invention is OT curing agent.

Specifically, the light stabilizer 770 in this example is HALS 770.

Preferably, the quartz stone plate with a low expansion coefficient provided by the embodiment of the invention is prepared from the following raw materials in parts by weight: 100 parts of bisphenol A epoxy resin, 30105 parts of antioxidant, 7703 parts of light stabilizer, KH 5701.2 parts of coupling agent, 0.7 part of OT curing agent and 900 parts of quartz powder.

On the other hand, the embodiment of the invention also provides a preparation method of the quartz stone plate with the low expansion coefficient, which comprises the following steps:

(1) uniformly stirring and mixing the bisphenol A epoxy resin, the antioxidant, the light stabilizer, the coupling agent, the curing agent and the like according to the proportion to obtain a mixture.

(2) And uniformly stirring the mixture and quartz powder according to the proportion to obtain the raw material.

(3) And (3) performing vibration pressing molding on the raw materials in a mold.

(4) And curing and molding the demoulded plate at 80-90 ℃ for 1.5-3.5 hours, and standing at room temperature for 60-84 hours after cooling to obtain the product.

In the step (1), the mixture is stirred at room temperature for 20 to 45 minutes, specifically 30 minutes. In the step (2), the mixture is stirred at room temperature for 20 to 40 minutes, specifically 30 minutes.

Wherein, in the step (3), the vacuum pressure is-0.09 Mpa, and the compacting time is 50-75 seconds (specifically, 60 seconds). The pressure and vibration frequency of the press forming are in accordance with the conventional techniques, for example, the pressure is 50-100t and the vibration frequency is 30-60 Hz.

Preferably, in the step (4), the curing temperature is 85 ℃ and the curing time is 2 hours; after cooling, the mixture was left at room temperature for 72 hours.

The technical scheme provided by the embodiment of the invention has the following beneficial effects: the embodiment of the invention provides a quartz stone plate with a low expansion coefficient and a preparation method thereof, wherein a specific antioxidant and a light stabilizer are added into the formula composition of the traditional artificial quartz stone to reduce the thermal expansion rate of the artificial stone, but the mechanical property is not obviously reduced, the artificial stone plate has excellent dimensional stability at high temperature, and the application requirement of the artificial stone as a building stone can be met.

Drawings

FIG. 1 is a graph comparing thermal expansion curves of examples 1 to 3 and comparative example 1 at 30 to 130 ℃ under the same conditions.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings.

Example 1:

embodiment 1 provides a method for preparing a quartz stone plate, including the steps of:

(1) weighing the following raw materials in parts by weight: 100 parts of bisphenol A epoxy resin, 30105 parts of antioxidant, KH 5701.2 parts of coupling agent and 0.7 part of OT curing agent, and 900 parts of quartz powder is weighed according to the flower color mixture ratio of the product.

(2) Pouring the resin, the antioxidant, the coupling agent and the OT curing agent into a container, stirring for 30 minutes, and uniformly mixing.

(3) Pouring the mixture of the polyester and the sandstone particles into a charging barrel, uniformly stirring, and pouring into a mold; placing into a vacuum vibration press, vacuumizing to-0.09 MPa, compacting, vibrating for 1min, and taking out for demolding.

(4) And (3) placing the sample taken out of the mold into an oven to be cured for 2 hours at the temperature of 85 ℃, cooling, taking out the sample, and storing at normal temperature for 3 days to finish post-curing of the resin to obtain the quartz stone plate.

Evaluation of the effects: as shown in FIG. 1, the linear thermal expansion coefficient of example 1 was significantly reduced to 1.5X 10 at room temperature⁵/deg.C, 2.4X 10 at 120 deg.C⁵v/deg.C, which is only 68% of common artificial stone; however, as shown in table 1, the mechanical properties were significantly reduced, and the flexural strength was about 78% of that of comparative example 1.

Example 2:

embodiment 2 provides a method for preparing a quartz stone plate, including the steps of:

(1) weighing the following raw materials in parts by weight: 100 parts of bisphenol A epoxy resin, 30103 parts of antioxidant, KH 5701.2 parts of coupling agent and 0.7 part of OT curing agent, and 900 parts of quartz sand particles are weighed according to the flower color proportion of the product.

(2) Pouring the resin, the antioxidant, the coupling agent and the OT curing agent into a container, stirring for 30 minutes, and uniformly mixing.

(3) Pouring the mixture of the polyester and the sandstone particles into a charging barrel, uniformly stirring, and pouring into a mold; placing into a vacuum vibration press, vacuumizing to-0.09 MPa, compacting, vibrating for 1min, and taking out for demolding.

(4) And (3) placing the sample taken out of the mold into an oven to be cured for 2 hours at the temperature of 85 ℃, cooling, taking out the sample, and storing at normal temperature for 3 days to finish post-curing of the resin to obtain the quartz stone plate.

Evaluation of the effects: as shown in FIG. 1, the linear thermal expansion coefficient of example 2 was maintained at 3.5X 10 at room temperature⁵/° c, there was no significant change in performance compared to comparative example 1; as shown in Table 1, the mechanical properties were slightly lowered, and the flexural strength was about 87% of that of comparative example 1.

Example 3:

embodiment 3 provides a method for preparing a quartz stone plate with a low expansion coefficient, comprising the following steps:

(1) weighing the following raw materials in parts by weight: 100 parts of bisphenol A epoxy resin, 30105 parts of antioxidant, 7703 parts of light stabilizer HALS, 0.7 part of coupling agent KH 5701.2 parts and OT curing agent, and 900 parts of quartz powder is weighed according to the flower color ratio of the product.

(2) Pouring the resin, the antioxidant, the light stabilizer, the coupling agent and the OT curing agent into a container, stirring for 30 minutes, and uniformly mixing.

(3) Pouring the mixture of the polyester and the sandstone particles into a charging barrel, uniformly stirring, and pouring into a mold; placing into a vacuum vibration press, vacuumizing to-0.09 MPa, compacting, vibrating for 1min, and taking out for demolding.

(4) And (3) placing the demoulded and taken out sample into an oven to be cured for 2 hours at 85 ℃, cooling, taking out the sample, and storing the sample at normal temperature for 3 days to finish post-curing of the resin, thereby obtaining the prepared artificial stone with low thermal expansion rate.

Evaluation of the effects: in both example 3 and example 1, 5 weight parts of antioxidant is added, and the linear thermal expansion coefficient of example 3 is lower than that of comparative example 1 and is reduced to 2.5X 10⁵/° c, about 65% of comparative example 1; however, the addition of the light stabilizer in example 3 improves the mechanical properties of the composition compared with examples 1 and 2 (as shown in table 1), improves the flexural strength by 22.8% and 9.7%, respectively, and reaches 95.5% of that of comparative example 1, and shows a significantly low linear expansion coefficient and good mechanical properties.

Example 4:

embodiment 4 provides a method for preparing a quartz stone slab with a low expansion coefficient, comprising the following steps:

(1) weighing the following raw materials in parts by weight: 85 parts of bisphenol A epoxy resin, 30102 parts of antioxidant, 7702 parts of light stabilizer HALS, 5701 parts of coupling agent KH and 1 part of OT curing agent, and 1000 parts of quartz powder is weighed according to the flower color ratio of the product.

(2) Pouring the resin, the antioxidant, the light stabilizer, the coupling agent and the OT curing agent into a container, stirring for 30 minutes, and uniformly mixing.

(3) Pouring the mixture of the polyester and the sandstone particles into a charging barrel, uniformly stirring, and pouring into a mold; placing into a vacuum vibration press, vacuumizing to-0.09 MPa, compacting, vibrating for 1min, and taking out for demolding.

(4) And (3) placing the demoulded and taken out sample into an oven to be cured for 2 hours at 85 ℃, cooling, taking out the sample, and storing the sample at normal temperature for 3 days to finish post-curing of the resin, thereby obtaining the prepared artificial stone with low thermal expansion rate.

Evaluation of the effects: the linear thermal expansion coefficient of example 4 was maintained at 2.7X 10 at room temperature⁵The mechanical properties are shown in Table 1.

Example 5:

embodiment 5 provides a method for preparing a quartz stone slab with a low expansion coefficient, comprising the following steps:

(1) weighing the following raw materials in parts by weight: 120 parts of bisphenol A epoxy resin, 30106 parts of antioxidant, 7705 parts of light stabilizer HALS, 0.5 part of coupling agent KH 5701.5 parts and OT curing agent, and 800 parts of quartz powder is weighed according to the flower color ratio of the product.

(2) Pouring the resin, the antioxidant, the light stabilizer, the coupling agent and the OT curing agent into a container, stirring for 30 minutes, and uniformly mixing.

(3) Pouring the mixture of the polyester and the sandstone particles into a charging barrel, uniformly stirring, and pouring into a mold; placing into a vacuum vibration press, vacuumizing to-0.09 MPa, compacting, vibrating for 1min, and taking out for demolding.

(4) And (3) placing the demoulded and taken out sample into an oven to be cured for 2.5 hours at the temperature of 80 ℃, cooling, taking out the sample and storing the sample at the normal temperature for 2.5 days to finish post-curing of the resin, and obtaining the prepared artificial stone with low thermal expansion rate.

Comparative example 1:

the preparation method of comparative example 1 is the same as the components and preparation methods of examples 1 to 3, except that: no antioxidant and light stabilizer are added into the raw materials.

Coefficient of thermal expansion test

According to JCT 908-2013, a PCY-III type high-temperature horizontal dilatometer is adopted to detect the thermal expansion coefficient of the unsaturated polyester artificial stone sample strip, and the specification of the sample strip is 50mm multiplied by 6 mm.

The room temperature was controlled at (20. + -. 1) ° C, the sample was first dried in a drying oven for 24 hours, and the length L0 of the sample was measured with a vernier caliper to the nearest 0.02 mm. The sample was placed in a thermal expansion instrument and the room temperature at that time was recorded. The thermodilatometer heating program was then started, heating from room temperature to 130 ℃ at a rate of 3 ℃/min. The length of the sample was recorded to the nearest 0.01mm throughout the heating process. The thermal expansion curve of each sample was plotted from the recorded data, and the results are shown in fig. 1.

The performance of examples 1-4 and comparative example 1 was tested and the results are shown in table 1:

TABLE 1

Sample (I)	Impact Strength/KJ.m-2	Flexural Strength/MPa
			Comparative example 1	3.61	44.70
Example 1	3.22	34.75
			Example 2	3.38	38.91
Example 3	3.54	42.68
			Example 4	3.41	42.55

From table 1, it can be seen that the mechanical properties of the quartz stone plate obtained by the invention and the quartz stone plate obtained by the conventional process are changed, and only the antioxidant 3010 is added, the mechanical properties such as bending strength and the like are reduced, however, the mechanical property reduction trend can be remarkably improved by adding the light stabilizer 770 in a compounding manner on the basis of reducing the linear expansion coefficient, and the comprehensive properties of the mechanical properties and the linear expansion coefficient of the artificial quartz stone are optimized.

Comparative example 2

Comparative example 2 is the same as comparative example 1 except that: 3 parts by weight of light stabilizer HALS 770 are added to the raw materials, and the product is tested, and the expansion coefficient and the mechanical property of the product are basically not changed relative to the comparison document 1.

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