Double-layer lvt soft foaming floor and production process

Abstract

The invention discloses a double-layer lvt soft foaming floor and a production process, and relates to the technical field of floors, the double-layer lvt soft foaming floor comprises an LVT double-layer structure, the LVT double-layer structure is composed of an upper-layer LVT structure and a lower-layer LVT foaming structure, and the upper-layer LVT structure is prepared from polyvinyl chloride resin, dioctyl terephthalate, stone powder, an outer lubricating lubricant, an inner lubricating lubricant and a heat stabilizer; the LVT foaming structure of the lower layer is made of polyvinyl chloride resin, dioctyl terephthalate, stone powder, LVT ground powder return materials, foaming agents, foaming regulators, outer lubricating lubricants and inner lubricating lubricants, the floor internally comprises an LVT double-layer structure through extrusion foaming, the upper layer is LVT, the lower layer is LVT foaming, and the hardness of the upper layer can be achieved while the foot feeling is guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of flooring, and in particular to a double-layer LVT soft foaming floor and a production process. Background Art

[0002] PVC flooring is made of polyvinyl chloride and its copolymer resin, stone powder as the main raw materials, with fillers, plasticizers, stabilizers, etc. added, and is formed by extrusion. In the process, a decorative layer and a wear-resistant layer are compounded. It is often used as the base of various stadiums or various sports venues, but the current PVC feels hard on the feet. When users exercise on it, they are prone to fatigue and have poor physical sensation. The venue also needs to use compound silent pads, cork, etc. to improve the foot feel, which increases the process, material and other costs. Summary of the invention

[0003] Purpose of the invention: The technical problem to be solved by the present invention is to provide a double-layer LVT soft foam floor and a production process, which solves the problem of the existing gymnasium floor being too hard.

[0004] Technical Solution

[0005] To solve the above problems, the technical solution provided by the present invention is:

[0006] A double-layer LVT soft foam floor comprises an LVT double-layer structure, wherein the LVT double-layer structure is composed of an upper LVT structure and a lower LVT foam structure, wherein the upper LVT structure is made of polyvinyl chloride resin, dioctyl terephthalate, stone powder, an external lubricant, an internal lubricant, and a heat stabilizer; and the lower LVT foam structure is made of polyvinyl chloride resin, dioctyl terephthalate, stone powder, LVT milled recycled material, a foaming agent, a foaming regulator, an external lubricant, and an internal lubricant.

[0007] Furthermore, the upper layer of the LVT structure contains 50-60 parts of polyvinyl chloride resin, 17-20 parts of dioctyl terephthalate, and 250-280 parts of stone powder.

[0008] Furthermore, the lower layer of the LVT double-layer structure contains 100-120 parts of polyvinyl chloride resin, 22-25 parts of dioctyl terephthalate, 240-260 parts of stone powder, 120-130 parts of LVT milled recycled material, 2.5 parts of foaming agent, and 1 part of foaming regulator.

[0009] Furthermore, the LVT structure of the upper layer is 3.8 times the material ratio of the base material, including 50 parts of polyvinyl chloride resin, 17 parts of dioctyl terephthalate, and 250 parts of stone powder.

[0010] Furthermore, the material ratio of the LVT double-layer structure of the lower layer includes 100 parts of polyvinyl chloride resin, 22 parts of dioctyl terephthalate, 250 parts of stone powder, 120 parts of LVT ground powder recycling, 2.5 parts of foaming agent, and 1 part of foaming regulator.

[0011] Furthermore, the external lubricant is PE wax, the internal lubricant is stearic acid, and the foaming agent is azodicarbonamide.

[0012] Furthermore, it also includes a UV layer, a wear-resistant layer, and a decorative layer.

[0013] A production process for a double-layer LVT soft foam floor, which is used for producing the double-layer LVT soft foam floor, comprises the following steps: high-speed stirring - low-speed stirring - twin-screw extrusion - coating - punching - edge chamfering and grooving.

[0014] Furthermore, the surface layer extruder, the glass fiber coating device and the bottom layer extruder are stacked in sequence, and the surface layer extruder and the bottom layer extruder are both provided with a feeding hopper, and the raw materials are transported to the feeding hopper through a screw feeder.

[0015] Furthermore, the LVT double-layer structure materials are respectively placed into different high-speed mixers and low-speed mixers, and the low-speed mixer of the double-layer material is connected to the feeding hopper of the surface layer extruder and the feeding hopper of the bottom layer extruder.

[0016] Beneficial Effects

[0017] Compared with the prior art, the technical solution provided by the present invention has the following beneficial effects:

[0018] The technical solution provided by the present invention uses extrusion foaming to make the floor contain an LVT double-layer structure, with the upper layer being LVT and the lower layer being LVT foam, thereby ensuring the foot feel while also achieving the hardness of the upper layer. The structure is formed in one step, reducing the number of steps and saving costs. Through double-layer extrusion, the surface layer is rigid and the lower layer is a foamed structure, which improves the foot feel. The floor can be used as a sports floor in various gymnasium scenes. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a product structure diagram of Embodiment 1 of the present invention;

[0020] Figure 2 This is a production flow chart of Example 1 of the present invention. DETAILED DESCRIPTION

[0021] In order to make the technical solution of the present invention clearer, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0022] Example 1

[0023] Combined with Figure 1-2 A double-layer LVT soft foam floor, whose main structure is a double-layer LVT board structure, which includes an LVT structure at the upper layer and an LVT foam structure at the lower layer. The double-layer LVT board structure is combined with a UV layer, a wear-resistant layer, and a decorative layer from top to bottom in sequence to obtain a double-layer LVT foam floor.

[0024] The UV layer, the wear-resistant layer and the decorative layer of the double-layer LVT foam floor can be directly obtained by using the structure and production method of the existing floor, and are not limited here.

[0025] The double-layer LVT structure, the upper LVT structure is made of polyvinyl chloride resin, dioctyl terephthalate, stone powder as the main materials, and is combined with external lubricant, internal lubricant, and thermal stabilizer.

[0026] The LVT foam structure of the lower layer is made of polyvinyl chloride resin, dioctyl terephthalate, stone powder, LVT powder recycling, foaming agent, foaming regulator, external lubricant, internal lubricant, and heat stabilizer. The use of LVT powder recycling can make the pores of the LVT foam layer delicate, the surface effect better and the fit will be more firm.

[0027] Among them, polyvinyl chloride resin is one of the basic materials of LVT double-layer structure, namely PVC, which belongs to resin material and is mainly used for shaping and mixing and connecting other materials;

[0028] Stone powder is the main filler for LVT double-layer structure, which can reduce costs and improve product stability;

[0029] Dioctyl terephthalate, a plasticizer, is one of the basic materials of LVT double-layer structure. It has the advantages of promoting plasticization, improving the heat resistance, cold resistance, volatility, anti-extraction, flexibility and good electrical insulation performance of the board. It shows excellent durability, soap water resistance and low-temperature flexibility in the finished product.

[0030] External lubricant, mainly used for lubrication between mechanical surfaces, preferably PE wax;

[0031] Internal lubricant, mainly for lubrication between material molecular chains, preferably stearic acid;

[0032] Thermal stabilizer is a chemical additive that can inhibit or slow down the thermal oxidation degradation of polyvinyl chloride (PVC) materials during processing. It inhibits the polymerization reaction of thermal decomposition products of PVC resin, improves the stability of PVC melt to heat and shear force, thereby extending the processing window and improving the appearance quality of the product. The preferred stabilizer is MC337MP.

[0033] Foaming regulator increases the pressure and torque of the PVC melt, thereby effectively increasing the cohesion and homogeneity of the PVC melt, making the resulting PVC products denser;

[0034] The foaming agent is used to generate bubbles in the LVT foaming layer. Chemical foaming agents are those that can release gases such as carbon dioxide and nitrogen after being decomposed by heating and form pores in the polymer composition. Azodicarbonamide is preferred.

[0035] The LVT double-layer structure is prepared from the above materials, and after the LVT double-layer structure is made into a double-layer LVT soft foam floor, the surface layer has a certain rigidity and the inner layer has a certain elasticity. After paving, the foot feel will be improved, and it can be used as a sports floor in various gymnasium scenes, so that when users exercise on the double-layer LVT soft foam floor, the force requirements of the exercise can be met, and the elastic structure of the internal foam can also play a certain protective role for the user. Its elasticity can buffer the impact force and reduce sports injuries. In addition, if an accident occurs during user exercise, the damage to the body by the floor will be greatly reduced.

[0036] The material of the upper plate of the LVT double-layer structure is:

[0037] To make 3.8 times the middle base material, 50-60 parts of polyvinyl chloride resin, 17-20 parts of dioctyl terephthalate, 250-280 parts of stone powder are needed, and a part of external lubricant, internal lubricant, heat stabilizer and other materials are mixed in proportion, and the upper layer material is made after stirring, internal mixing, open mixing and calendering.

[0038] 3.8 times the middle base material refers to the middle material or base material in which the mass ratio of stone powder to PVC and plasticizer is 3.8. It is mainly for the purpose of selectively designing the hardness of the finished floor according to different usage environments or design requirements, and can also reduce production costs. 3.8 times the middle base material is used in a larger proportion in the floor, and the floor made according to this ratio can suit most of the user's life scenarios.

[0039] The material of the lower foam board of the LVT double-layer structure is:

[0040] 100-120 parts of polyvinyl chloride resin, 22-25 parts of dioctyl terephthalate, 240-260 parts of stone powder, 120-130 parts of LVT ground recycled materials. After testing, the product using LVT ground recycled materials has fine pores, better surface effect and stronger fit, 2.5 parts of foaming agent, 1 part of foaming regulator, plus a part of external lubricant, internal lubricant, heat stabilizer and other materials are mixed in proportion.

[0041] External lubricants, internal lubricants, and thermal stabilizers can be changed accordingly according to the state of the base materials during the production process.

[0042] The production process of double-layer lvt soft foam floor is:

[0043] High-speed stirring - low-speed stirring - twin-screw extrusion - coating - punching - chamfering and grooving.

[0044] The upper layer is a conventional LVT extrusion formula, and the lower layer is LVT foaming, which is made into a half-cost through the co-extrusion compound mode. It is coated according to the required surface effect and punched into the required specifications. It can also be subsequently opened into a straight-fall buckle type to make a lock floor.

[0045] In actual production, the specific ratio of the LVT double-layer structure is preferably:

[0046] Upper layer: 3.8 times the base material formula includes 50 parts of polyvinyl chloride resin, 17 parts of dioctyl terephthalate, 250 parts of stone powder, and a part of external slip, internal slip, heat stabilizer and other materials are mixed in proportion.

[0047] Lower layer: 100 parts of polyvinyl chloride resin, 22 parts of dioctyl terephthalate, 250 parts of stone powder, 120 parts of LVT milled powder recycled material, 2.5 parts of foaming agent, 1 part of foaming regulator, plus a part of external slip, internal slip, heat stabilizer and other materials mixed in proportion.

[0048] The surface layer extruder, the glass fiber coating device and the bottom layer extruder are stacked in sequence. The surface layer extruder and the bottom layer extruder are both provided with a feeding hopper. The raw materials are transported to the feeding hopper through a screw feeder. The twin-screw feeding structure in the barrel stirs and plasticizes the raw materials before outputting them.

[0049] The fiberglass covering device is used to set a layer of fiberglass between the LVT double-layer structure. The fiberglass can improve the stability of the product.

[0050] The LVT double-layer structure materials are placed into different high-speed mixers and low-speed mixers respectively, and the low-speed mixer of the double-layer material is connected to the feeding hopper of the surface layer extruder and the feeding hopper of the bottom layer extruder.

[0051] High stirring: the discharge time of the hot pot and hot machine is 60S, the mixing time is 600S, and the discharge temperature of the hot machine is 95 degrees Celsius.

[0052] Low stirring: When the temperature reaches the set value, start low-speed stirring and put the materials into the cold pot at the same time. The cold machine discharge time is 180S, the mixing time is 24S, and the cold machine discharge temperature is 50 degrees Celsius.

[0053] Twin-screw extruder: The raw materials are also transported by the screw feeder and fed into the barrel. The materials are sent into the barrel for plasticization through the twin-screw structure. The plasticized materials are sent into the confluence core through the twin screws. The materials passing through the confluence core form cylindrical rods.

[0054] Twin-screw extruder extrude the material through the die, and the thickness can be adjusted by adjusting the die size, so that the rod material can be extruded into a plate material that can be used directly.

[0055] The upper layer is covered with a color film wear-resistant layer and laminated with the lower layer. The silicone roller and the patterned roller form the second roller group. The sheet is fed into the roller from the first roller group, and is rolled by the mirror roller and the second roller group in turn before being output to form the LVT floor.

[0056] Coating: After curing, the product is coated and semi-cured under UV light. The paint weight is 7±1g / m 2 . Apply another coat of primer, semi-cured by UV light, curing energy 250-500mj / cm 2 , paint weight 13±1g / m 2 . And a top coat weight 10±1g / m 2 , UV light, curing energy 1000-1500mj / cm 2 .

[0057] Punching: The product is punched according to the required specifications to achieve the required specifications.

[0058] Chamfering and grooving: Chamfering and grooving are performed according to customer needs. Generally, the straight-drop buckle type is recommended.

[0059] Through the above production method, the structure of the double-layer lvt soft foam floor can be formed in one step, reducing the process and saving costs. Different from the foaming of WPC and other boards on the market, this product can be bent, and the proportion of the upper layer of stone powder can be adjusted according to the needs to make it into a coiled material. Compared with the rubber coiled materials on the market, the cost will be much lower.

[0060] Through double-layer extrusion, the surface layer is rigid and the lower layer is a foam structure, which improves the foot feel. It can be used as sports floor in various gymnasiums.

[0061] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A double-layer lvt soft foam floor, characterized in that: It includes an LVT double-layer structure, which consists of an upper LVT structure and a lower LVT foam structure. The upper LVT structure is made of polyvinyl chloride resin, dioctyl terephthalate, stone powder, external lubricant, internal lubricant, and thermal stabilizer; the lower LVT foam structure is made of polyvinyl chloride resin, dioctyl terephthalate, stone powder, LVT milled recycled material, foaming agent, foaming regulator, external lubricant, and internal lubricant.

2. A double-layer lvt soft foam floor according to claim 1, characterized in that: The upper layer of the LVT structure contains 50-60 parts of polyvinyl chloride resin, 17-20 parts of dioctyl terephthalate and 250-280 parts of stone powder.

3. A double-layer lvt soft foam floor according to claim 1, characterized in that: The lower layer of the LVT double-layer structure contains 100-120 parts of polyvinyl chloride resin, 22-25 parts of dioctyl terephthalate, 240-260 parts of stone powder, 120-130 parts of LVT grinding recycle, 2.5 parts of foaming agent and 1 part of foaming regulator.

4. A double-layer lvt soft foam floor according to claim 2, characterized in that: The LVT structure of the upper layer is 3.8 times the material ratio of the base material, including 50 parts of polyvinyl chloride resin, 17 parts of dioctyl terephthalate, and 250 parts of stone powder.

5. The double-layer lvt soft foam floor according to claim 3, characterized in that: The material ratio of the LVT double-layer structure of the lower layer includes 100 parts of polyvinyl chloride resin, 22 parts of dioctyl terephthalate, 250 parts of stone powder, 120 parts of LVT ground powder recycling, 2.5 parts of foaming agent, and 1 part of foaming regulator.

6. The double-layer lvt soft foam floor according to claim 1, characterized in that: The external lubricant is PE wax, the internal lubricant is stearic acid, and the foaming agent is azodicarbonamide.

7. The double-layer lvt soft foam floor according to claim 1, characterized in that: It also includes a UV layer, a wear-resistant layer, and a decorative layer.

8. A production process for producing the double-layer LVT soft foam floor according to any one of claims 1 to 7, characterized in that: High-speed stirring - low-speed stirring - twin-screw extrusion - coating - punching - chamfering and grooving.

9. The production process of a double-layer LVT soft foam floor according to claim 8, characterized in that: The invention comprises a surface layer extruder, a glass fiber coating device and a bottom layer extruder which are stacked in sequence. The surface layer extruder and the bottom layer extruder are both provided with a feeding hopper, and the raw materials are transported to the feeding hopper through a screw feeder.

10. The production process of a double-layer LVT soft foam floor according to claim 8, characterized in that: The LVT double-layer structure materials are placed into different high-speed mixers and low-speed mixers respectively, and the low-speed mixer of the double-layer material is connected to the feeding hopper of the surface layer extruder and the feeding hopper of the bottom layer extruder.

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