Tombstone and preparation method thereof

Abstract

The preparation method comprises the following steps: S1, mixing an unsaturated polyester resin base, chopped glass fibers, silicon dioxide, titanium dioxide, a polyethylene glycol dispersing agent, a curing agent, an accelerant and a release agent to prepare a modified DMC (Dimethyl Carbonate) bulk material; s2, injecting the modified DMC briquettes into a mold in a layered manner, directionally arranging a base layer with high fiber content, and adding a weather-proof filler into a surface layer to form a functional gradient structure; s3, integrated forming is achieved through microwave gradient heating and hot-pressing curing, surface laser engraving and waterproof treatment are conducted after curing, and then the tombstone is obtained; traditional stone, metal and concrete are replaced, the problems of ecological damage of stone mining, metal corrosion and insufficient concrete strength are solved, the material density is low, the weight is light, the transportation and installation cost is reduced, the material can be recycled after being discarded, and the environmental protection property is remarkably improved.

Description

Technical Field

[0001] The present invention relates to a tombstone, and particularly to a tombstone and a preparation method thereof. Background Art

[0002] A tombstone is an important item for commemorating the deceased. Traditional tombstones are usually made of materials such as stone, metal, or concrete. Although traditional stone tombstones are strong and durable, they cause great damage to the environment during the mining and processing process, and are heavy, with high transportation and installation costs. Metal tombstones are prone to corrosion, especially in humid environments, and have a limited service life. Concrete tombstones have low strength, poor weather resistance, and are prone to cracks and weathering. At the same time, the production process of traditional tombstone materials often consumes a large amount of resources, and it is difficult to handle after being discarded, causing a burden on the environment.

[0003] Therefore, there is an urgent need for a composite tombstone and a preparation method thereof to solve the technical problems existing in the above-mentioned prior art. Summary of the Invention

[0004] The present invention overcomes the deficiencies of the prior art and provides a tombstone and a preparation method thereof.

[0005] To achieve the above object, the technical solution adopted by the present invention is: a tombstone and a preparation method thereof, including the following steps:

[0006] S1. Mix unsaturated polyester resin base, chopped glass fiber, silicon dioxide, titanium dioxide, polyethylene glycol dispersant, curing agent, accelerator, and release agent to obtain modified DMC compound.

[0007] S2. Inject the modified DMC compound into the mold layer by layer. The base layer has a high fiber content and is arranged in a directional manner, and weather-resistant fillers are added to the surface layer to form a functional gradient structure.

[0008] S3. Through microwave gradient heating and hot press curing, integrated molding is achieved. After curing, surface laser engraving and waterproof treatment are carried out to obtain the tombstone.

[0009] In a preferred embodiment of the present invention, the mass ratio of each component in the modified DMC compound is: 40 - 50 parts of unsaturated polyester resin base, 20 - 30 parts of chopped glass fiber, 5 - 8 parts of silicon dioxide, 3 - 5 parts of titanium dioxide, 0.5 - 1.2 parts of polyethylene glycol dispersant, 2 - 3 parts of curing agent, 0.5 - 1 part of accelerator, and 1 - 2 parts of release agent.

[0010] In a preferred embodiment of the present invention, in step S2, the content of chopped glass fiber in the base layer is 25 - 30 parts, the glass fiber is arranged in a directional manner along the height direction of the tombstone, and 0.3 - 0.5 parts of nano-zinc oxide are added to the surface layer.

[0011] In a preferred embodiment of the present invention, in step S3, the power in the initial stage of the microwave gradient heating is 300 - 400 W, lasting for 8 - 10 min; the power in the intermediate stage is 500 - 650 W, lasting for 10 - 30 min; the power in the final stage is 400 - 500 W, lasting for 20 - 30 min, the ambient temperature is 80 - 120 °C, and the total curing time is 40 - 60 min. This avoids the problems of overheating on the surface or under-curing inside in traditional hot pressing and curing, ensuring that the resin is fully cross-linked with the fibers and fillers to form a dense and defect-free matrix; at the same time, it also reduces the generation of microcracks in the internal structure, blocks the penetration paths of ultraviolet rays and water vapor, and significantly improves the anti-environmental aging ability compared with the porous structure of concrete tombstones and the natural fissures of stone tombstones.

[0012] In a preferred embodiment of the present invention, in step S3, a metal fluorocarbon paint is sprayed on the outer surface of the tombstone at a spraying amount of 15 - 25 g / m 2 .

[0013] In a preferred embodiment of the present invention, based on the above-mentioned method for manufacturing a tombstone, a tombstone is prepared, including a base layer and a surface layer, both of which are made of the modified DMC compound. The length of the tombstone is 80 - 95 cm, the width is 50 - 60 cm, and the thickness is 10 - 15 cm.

[0014] The present invention solves the defects in the background art and has the following beneficial effects:

[0015] (1) Nano-zinc oxide and rutile titanium dioxide are added to the surface layer, and the two form a composite light shielding system. Nano-zinc oxide can absorb ultraviolet rays with wavelengths of 280 - 400 nm, thereby blocking the degradation of the resin matrix by high-energy rays; at the same time, titanium dioxide reduces the photo-aging effect by reflecting and scattering ultraviolet rays, and at the same time improves the anti-chalking ability of the material surface. Compared with traditional metal tombstones that are prone to rust and discolor due to ultraviolet rays and concrete tombstones whose substrates age and fade due to ultraviolet rays, the production of this tombstone inhibits color change and structural deterioration from the inside of the material, and maintains the appearance stability for a long time.

[0016] (2) The content of chopped glass fibers in the surface layer is reduced to 20 - 25 parts, which is lower than 25 - 30 parts in the base layer. The proportion of fillers is relatively increased, thereby reducing the surface roughness caused by fiber exposure, forming a more uniform and delicate protective layer, reducing the direct contact between ultraviolet rays, water vapor and the matrix resin, and avoiding local aging problems caused by uneven fiber distribution in traditional composite materials.

[0017] (3) A metal fluorocarbon paint is sprayed on the outer surface. The fluorocarbon paint has extremely strong chemical stability, is resistant to acid rain, salt spray and ultraviolet rays, and thus forms a long-term anti-corrosion barrier, further improving the weather resistance of the tombstone. Description of the Drawings

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings required in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only some embodiments recorded in the present invention. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can also be obtained based on these drawings;

[0019] Figure 1 It is a flowchart of the manufacturing method of the preferred embodiment of the present invention. Specific embodiments

[0020] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0021] Many specific details are set forth in the following description in order to fully understand the present invention, but the present invention can also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited by the specific embodiments disclosed below.

[0022] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the scope of protection of the present application. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Therefore, the features defined with "first", "second", etc. may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise stated, the meaning of "plurality" is two or more.

[0023] In the description of this application, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", and "linkage" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0024] As Figure 1 shown, a method for preparing a tombstone includes the following steps:

[0025] S1: DMC mass ratio of the formula, select 40 - 50 parts of unsaturated polyester resin with a viscosity of 750 - 900 Pa·s, 20 - 30 parts of chopped glass fiber, 5 - 8 parts of silicon dioxide, 3 - 5 parts of titanium dioxide, 0.5 - 1.2 parts of polyethylene glycol dispersant, 2 - 3 parts of curing agent, 0.5 - 1 part of accelerator, and 1 - 2 parts of demoulding agent.

[0026] Modification treatment of DMC mass ratio: Add unsaturated polyester resin, chopped glass fiber with a length of 3 - 5 mm, silicon dioxide with an average particle size ≤ 5 μm, rutile titanium dioxide with a particle size ≤ 10 μm, and polyethylene glycol dispersant into a high-speed mixer, and stir at a speed of 600 - 800 rpm for 15 - 20 min to make the glass fiber evenly dispersed and combined with the filler.

[0027] S2: Mold filling and structural layer-by-layer filling, including a base layer and a surface layer; among them, the production of the base layer includes increasing the content of chopped glass fiber to 25 - 30 parts, reducing the proportion of titanium dioxide to 1 - 3 parts, and enhancing the structural strength; injecting the mixed DMC mass ratio into the base layer mold, adopting the directional vibration compaction technology, adjusting the vibration frequency to 50 - 80 Hz, and the pressure to 10 - 15 MPa to make the glass fiber arranged in the height direction of the tombstone, and the thickness accounts for 60 - 70% of the whole; the production of the surface layer includes increasing the content of titanium dioxide to 4 - 5 parts, adding 0.3 - 0.5 parts of nano-zinc oxide to enhance the ultraviolet shielding, and reducing the glass fiber to 20 - 25 parts to ensure a delicate surface; before the base layer is cured, cover the surface layer DMC mass ratio above the base layer, and the thickness ratio is 30 - 40% to form an integrated structure.

[0028] S3: Curing and forming and surface treatment, adopting the gradient curing method, using microwave + hot press composite curing, and the environmental temperature is 80 - 120 °C. Microwave power gradient control:

[0029] Initial stage (0 - 10 min): Power 300 - 400 W, slow heating to avoid surface cracking;

[0030] Intermediate stage (10 - 30 min): Power 500 - 650 W, rapidly cure the resin matrix, and promote the interfacial bonding between glass fiber and resin;

[0031] Final stage (30 - 50 min): Power 400 - 500 W, keep warm and cure to ensure complete internal cross - linking, and the total curing time is 40 - 60 min.

[0032] Surface treatment: After curing, use laser engraving technology to engrave words on the surface layer; Coat a layer of nano - silicon waterproof coating with a thickness of 5 - 10 μm on the surface to further improve the waterproof performance.

[0033] Examples

[0034] Raw materials for preparing DMC mass: 45 parts of unsaturated polyester resin base, 25 parts of 3 - mm chopped glass fiber with a longitudinal arrangement rate ≥ 80%, 6 parts of silicon dioxide, 4 parts of titanium dioxide, 0.8 part of polyethylene glycol dispersant, 2.5 parts of curing agent, 0.8 part of accelerator, 1.5 parts of release agent.

[0035] Mixing of raw materials: Select a high - speed mixer, mix at a speed of 700 rpm for 18 min to ensure that the fibers are not agglomerated and the fillers are evenly dispersed.

[0036] Mold filling: Inject the mixed modified DMC mass into the mold, adjust the vibration compaction conditions to 60 Hz, 12 MPa, and immediately cover the surface layer mass;

[0037] Curing of raw materials: Set the initial microwave power to 350 W, curing time 10 min, intermediate power 550 W, curing time 25 min, final power 450 W, curing time 25 min, ambient temperature 100 °C, and total curing time 60 min.

[0038] Adopt laser engraving technology, the surface engraving depth is 0.5 - 1 mm; The spraying amount of nano - silicon coating is 30 - 40 g / m 2 , forming a hydrophobic layer.

[0039]

[0040] Result analysis: The compressive strength of the tombstone is 81.2 MPa, meeting the load - bearing requirements of the tombstone and far exceeding the 30 - 50 MPa of traditional concrete tombstones. The water absorption rate is 0.75%, much lower than the 5 - 10% of traditional concrete, meeting the outdoor waterproof requirements. The weather resistance ΔE = 1.3, superior to the easy rusting and discoloration of metal tombstones and the easy weathering and fading of concrete tombstones. The surface hardness is D78, with moderate hardness, higher than wood and lower than stone, suitable for laser engraving. The engraving accuracy line width is 0.3 mm, meeting the fine engraving requirements such as inscriptions and patterns.

[0041] Through the multi-layer protection logic of "filler shielding ultraviolet rays - coating blocking water vapor - structure eliminating defects - material weather resistance upgrading", a weather resistance improvement system from the inside to the surface of the material is constructed, systematically solving the problems of discoloration, cracking, rusting, weathering, etc. of traditional tombstones caused by environmental factors such as ultraviolet rays, water, and temperature changes, enabling the tombstone to maintain the integrity of its appearance and the stability of its structure during long-term outdoor use, greatly extending its service life, and being particularly suitable for complex environments with high ultraviolet rays, humidity, or severe pollution.

[0042] Based on the inspiration of the ideal embodiments of the present invention as above, through the above description, relevant personnel can completely make various changes and modifications without departing from the technical idea of the present invention. The technical scope of the present invention is not limited to the content in the specification, and the technical scope must be determined according to the scope of the claims.

Claims

1. A method for preparing a tombstone, characterized in that, It includes the following steps: S1. Mix unsaturated polyester resin base, chopped glass fiber, silica, titanium dioxide, polyethylene glycol dispersant, curing agent, accelerator and demolding agent to obtain modified DMC compound; S2. Inject the modified DMC compound into the mold layer by layer. The base layer has a high fiber content and is arranged directionally, and weather-resistant fillers are added to the surface layer to form a functional gradient structure; S3. Through microwave gradient heating and hot press curing, integrated molding is achieved. After curing, surface laser engraving and waterproof treatment are carried out to obtain a tombstone.

2. The preparation method of a tombstone according to claim 1, characterized in that: The mass ratio of each component in the modified DMC compound is: 40-50 parts of unsaturated polyester resin base, 20-30 parts of chopped glass fiber, 5-8 parts of silica, 3-5 parts of titanium dioxide, 0.5-1.2 parts of polyethylene glycol dispersant, 2-3 parts of curing agent, 0.5-1 part of accelerator, and 1-2 parts of demolding agent.

3. The manufacturing method of a tombstone according to claim 1, characterized in that: In step S2, the content of chopped glass fiber in the base layer is 25-30 parts, the glass fiber is arranged directionally along the height direction of the tombstone, and 0.3-0.5 parts of nano-zinc oxide are added to the surface layer.

4. The preparation method of a tombstone according to claim 1, characterized in that: In step S3, the power in the initial stage of the microwave gradient heating is 300-400W and lasts for 8-10min; the power in the intermediate stage is 500-650W and lasts for 10-30min; the power in the final stage is 400-500W and lasts for 20-30min, the ambient temperature is 80-120°C, and the total curing time is 40-60min.

5. The preparation method of a tombstone according to claim 1, characterized in that: In step S3, metal fluorocarbon paint is sprayed on the outer surface of the tombstone at a spraying amount of 15 to 25 g / m 2 .

6. A tombstone, based on the method for manufacturing a tombstone according to any one of claims 1-5, characterized in that, It includes a base layer and a surface layer. Both the base layer and the surface layer are made of the modified DMC compound. The length of the tombstone is 80-95cm, the width is 50-60cm, and the thickness is 10-15cm.

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