WO2021258421A1

WO2021258421A1 - Full-water-based foamed polyurethane sheet material and preparation method therefor

Info

Publication number: WO2021258421A1
Application number: PCT/CN2020/100389
Authority: WO
Inventors: 龙钟江; 唐道远
Original assignee: 深圳市龙睿新材料科技有限责任公司; 安徽森泰木塑集团股份有限公司
Priority date: 2020-06-24
Filing date: 2020-07-06
Publication date: 2021-12-30
Also published as: CN111674137A

Abstract

The present invention relates to a full-water-based foamed polyurethane sheet material and a preparation method therefor, relating to the technical field of polyurethane foam reinforced sheet material. The polyurethane sheet material comprises an elastic surface layer and a reinforced rigid foam core layer; the reinforced foam core layer is a rigid foam material reinforced with a porous framework, the rigid foam material at least filling a porous structure of the porous framework; the rigid foam material is a polyurethane rigid foam formed using polyol and isocyanate as main raw materials and water as a foaming agent. The present invention uses polyol and isocyanate as main raw materials and water as a foaming agent to form polyurethane rigid foam, having the advantage of being environmentally friendly; in terms of product results, the foam made using this method has better mechanical performance than foaming with a traditional foaming agent such as 141B, mainly because the water reacts with the NCO groups and the produced CO₂ has a foaming effect, and more chemical crosslinking points can also be formed, thereby improving mechanical performance.

Description

All-water-based foamed polyurethane board and preparation method thereof

Technical field

The invention relates to a polyurethane board, in particular to a water-based foamed polyurethane board and a preparation method thereof. It belongs to the technical field of polyurethane foamed reinforced board.

Background technique

GB2445714B discloses a sheet material, which includes a surface layer with relief and a core filled with plastic material. The core acts as a support beam; the surface layer is attached to the core without the use of an adhesive; The surface layer forms a non-slip layer; it is characterized in that the core is fiber-reinforced; the surface layer uses less filler than the core. In contrast, the surface layer is softer and the core is harder; the core acts as a support At the same time as the beam, the surface layer has a cushioning effect.

technical problem

The boards disclosed in the above-mentioned documents are favored by consumers because of their lighter weight, realistic log appearance, and soft foot feel when in use. However, this board has obvious drawbacks. The first shortcoming is that the compressive strength of the plate is not high, which is mainly manifested in that when a heavy object is loaded on the plate, the plate is prone to collapse; the second shortcoming is that the overall strength of the plate is not high, which is mainly manifested as When the span is large, the board is prone to bend or even break; the third disadvantage is that the bonding strength of the board is not high, which is mainly manifested in the long-term use, the surface layer and the core layer of the board are prone to cracking.

Technical solutions

The present invention aims to solve the above-mentioned problems, thereby providing an all-water-based foamed polyurethane board.

The technical solutions of the present invention to solve the above-mentioned problems are as follows:

An all-water-based foamed polyurethane board, comprising an elastic surface layer and a reinforced rigid foamed core layer; the reinforced foamed core layer is a rigid foamed material reinforced with a porous skeleton, and the rigid foamed material It is filled at least in the porous structure of the porous skeleton; the rigid foaming material is a rigid polyurethane foam formed by using polyols and isocyanates as main raw materials and water as a foaming agent.

In the above technical solution of the present invention, the rigid foamed core layer is reinforced by a porous skeleton. The porous skeleton is a monolithic plate with dispersedly distributed vertical holes on the plate surface. The holes may be arranged through, It can also be non-through arrangement, and through arrangement is preferred; the porous framework is first of all a self-stabilizing structure, so the porous framework board itself has a certain compressive strength, and it can also provide for the weight loaded on the porous framework board. support. When the porous skeleton is used as a reinforcing material, the rigid foaming material is filled in the pores, and even the upper and lower surfaces of the porous skeleton can be covered to form a covering layer. This combined structure can significantly improve the compressive strength of the composite board. . Preferably, the thickness of the covering layer is as thin as possible. Therefore, after the rigid foam material is reinforced by the porous framework, it can provide better support for the heavy objects loaded on the board surface, so as to avoid the problem of board surface collapse.

In the above-mentioned technical scheme of the present invention, polyols and isocyanates are used as main raw materials, and water is used as a foaming agent to form rigid polyurethane foams, which has the advantage of environmental protection; compared with traditional foaming agents such as 141B foaming, this method of foaming, In terms of product results, it has better mechanical properties, mainly because water reacts with NCO groups, and the generated CO ₂ has a foaming effect, and at the same time, it can form more chemical cross-linking points, thereby improving mechanical properties; in addition, Compared with the traditional foaming agent such as 141B foaming, this method of foaming is more rapid in terms of reaction characteristics, and the process needs to be properly controlled.

Preferably, the raw material of the rigid foam material includes the following components by mass: polyether polyol/polyester polyol 40-60, isocyanate 40-60, filler 10-30, coupling agent 3-6, Flame retardant 8-16, pigment 3-6.

Preferably, the porous framework is a self-supporting plate with a porous structure, such as a grid plate, a mesh plate, a honeycomb plate, and the like.

Preferably, the porous framework is a support plate with a honeycomb structure.

In the above technical solution of the present invention, the material of the porous framework is generally not limited, for example, it can be metal, plastic, etc.

Preferably, the material of the porous skeleton is selected from one or more blended materials of PI, PP, PE, PET, PC, ABS, PVC, PVB, EVA, and aramid.

As a further preference, when the material of the porous skeleton is metal, it is preferably aluminum or aluminum alloy. When the material of the porous skeleton is plastic, it is preferably PI or aramid.

Preferably, the material of the elastic surface layer is thermoplastic elastomer.

As a further preference, the material of the elastic surface layer is a non-foamed polyurethane material (TPU), and a wood texture pattern is formed on the surface.

Preferably, it also includes an inter-fusion layer, which is arranged between the elastic surface layer and the reinforced foam core layer; The fully cured and fluidized raw materials, and the incompletely cured raw materials constituting the elastic surface layer, penetrate each other, and then solidify to form a transition layer; and the elastic surface layer is integrally connected with the interfusion layer, and the mutual The melting layer is integrally connected with the reinforced rigid foamed core layer, so that a continuous phase interface is formed between the elastic surface layer and the reinforced rigid foamed core layer.

Preferably, the thickness of the interfusion layer is 0.1 to 1.0 mm.

In the above technical solution of the present invention, the interfusion layer is used as a transition layer between the elastic surface layer and the reinforced hard foamed core layer, and plays the role of enhancing the bonding force between the surface layer and the core layer. In the present invention, when the surface layer and the core layer are not completely solidified, their raw materials are allowed to penetrate each other at their interactive interface to achieve the effect of mutual dissolution and mutual fusion, thereby forming a mutual fusion layer; the formation of the mutual fusion layer also makes the surface layer and the mutual fusion The layers are integrally connected, so that the interfusion layer and the rigid foamed core layer are integrally connected, so that a continuous phase interface is formed between the elastic surface layer and the reinforced rigid foamed core layer, thereby improving the bonding force of the surface layer and the core layer, The board of the present invention has good peel strength. Studies have shown that, according to GB/T-24137, the inter-fusion layer can increase the surface bonding strength of the board to at least 2.0MPa.

Preferably, according to GB/T-24137, the flexural strength of the plate at a span of 300 mm is 15.0 MPa or more, and the flexural modulus is 500 MPa or more; the bonding strength of the elastic surface layer of the plate is 2.5 MPa or more; According to ASTM D 6117-97, the nail holding force of the board surface is above 500N.

Preferably, it also includes an enhanced net, and the enhanced net is distributed in the inter-fusion layer.

Preferably, the bottom of the board is further formed with a skin layer integrally connected with the reinforced hard foamed core layer, and the reinforced net is also arranged on the reinforced hard foamed core layer and the Between the crust layers.

Preferably, the material of the reinforcing mesh is selected from metallic materials, inorganic non-metallic materials, polymer organic materials, plant fibers or their composite materials.

Preferably, according to GB/T-24137, the flexural strength of the plate at a span of 300 mm is 18.0 MPa or more; the flexural modulus is 780 MPa or more; the bonding strength of the elastic surface layer of the plate is 2.8 MPa or more; According to ASTM D 6117-97, the nail holding force of the board surface is above 1100N.

In the above technical solution of the present invention, the strength of the whole board is strengthened by adding a reinforcing net. It is mainly reflected in: on the one hand, the setting of the reinforcement net can make the composite board have better integrity when resisting pressure, that is, it can better distribute the local pressure of the composite board to the overall board surface, thereby reducing the pressure; on the other hand, , The setting of the reinforcement net also improves the rigidity of the overall plate, which is similar to the effect of the steel frame on the silicate concrete. Therefore, after the inter-fusion layer is reinforced by the reinforcing mesh, the load-bearing capacity of the board can be significantly improved, and the flexural modulus of the board under a certain span can also be improved. When the flexural modulus of the board is increased, the span can be increased when laying the floor, thereby significantly reducing the amount of keel, which can improve installation efficiency and reduce installation costs.

Another object of the present invention is to provide a method for preparing the above-mentioned all-water-based foamed polyurethane board. The technical scheme is as follows:

A preparation method of an all-water-based foamed polyurethane board includes the following steps:

a. Coat the release agent in the gravure mold, and then input the raw materials constituting the elastic surface layer into the gravure mold to obtain the elastic surface layer with embossed wood texture;

b. When the elastic surface layer is not completely cured and still has fluidity, input the raw materials constituting the rigid foam core layer into the gravure mold;

c. When the rigid foamed core layer is not completely cured and still has fluidity, implant the porous skeleton into the raw material of the rigid foamed core layer;

d. Clamping and curing;

e. Demoulding to obtain the board.

Preferably, in step b, when the elastic surface layer is not completely cured and still has fluidity, a layer of reinforcing mesh is first laid, and then the raw materials constituting the rigid foam core layer are input into the intaglio mold; in step d, first Lay a layer of reinforcement net, then close the mold and mature.

Preferably, in step a, after the release agent is coated in the gravure mold, the protective paint layer, the top paint layer and the primer layer are sequentially applied; after the paint film is cured, the raw materials constituting the elastic surface layer are input into the gravure plate Inside the mold.

Beneficial effect

In summary, the present invention has the following beneficial effects:

1. The rigid foamed layer of the present invention can significantly improve the compressive strength of the composite board after being reinforced by the porous frame, and can provide better support for the heavy objects loaded on the board surface to avoid the problem of board surface collapse. ；

2. The interfusion layer of the present invention improves the bonding force between the surface layer and the core layer;

3. After the inter-fusion layer of the present invention is reinforced by the reinforcing net, it can significantly increase the load-bearing capacity of the board and increase the flexural modulus of the board under a certain span; and when the flexural modulus of the board is increased, when laying the floor, The span can be increased, thereby significantly reducing the amount of keel, which can not only improve installation efficiency, but also reduce installation costs.

Description of the drawings

Figure 1 is a schematic structural diagram of Embodiment 1 of the present invention;

Figure 2 is a partial enlarged view of Figure 1;

Figure 3 is a schematic diagram of one of the structures of the porous framework;

4 is a schematic structural diagram of Embodiment 2 of the present invention;

Figure 5 is a partial enlarged view of Figure 4;

In the figure, 1-elastic surface layer, 2-reinforced mutual melting layer, 3-reinforced rigid foam core layer, 4-reinforced net, 5-skin layer; 31-porous skeleton, 32-hard foam material.

The best mode of the present invention

Example one

As shown in Figures 1 and 2, an all-water-based foamed polyurethane board includes an elastic surface layer 1, an inter-fusion layer 2, a reinforced rigid foam core layer 3, and a skin layer 5 from top to bottom. The reinforced hard foamed core layer 3 and the skinning layer 5 are integrally connected.

The material of the elastic surface layer 1 is a non-foamed polyurethane material, and a wood texture pattern is formed on the surface.

As shown in Figure 2, in order to better express the structure of the interfusion layer 2 and its connection with the elastic surface layer 1 and the reinforced rigid foam core layer 3, the interfusion layer 2 is shown in this figure. The enlargement process means that the thickness of the inter-fusion layer 2 of the actual product is much smaller than the ratio shown in the figure.

The reinforced rigid foamed core layer 3 is a rigid foamed material 32 reinforced by a porous skeleton 31, and the rigid foamed material 32 is filled in the porous structure of the porous skeleton 31. In this embodiment, the porous frame 31 is a honeycomb panel, and the structure of the honeycomb panel is shown in FIGS. 2 and 3. In this embodiment, the material of the honeycomb panel is PP. The rigid foam material 32 is a rigid polyurethane foam; in this embodiment, the density of the rigid polyurethane foam is 0.55 g/cm³.

The miscible layer 2 is an incompletely solidified and fluid raw material constituting the rigid foaming material 32, and the incompletely solidified raw material constituting the elastic surface layer 1 is mutually soluble under pressurization, and then solidified to form a whole structure. The pressurization described in this embodiment does not mean providing external pressure, but is combined with the curing process after the mold is closed through the control process. During this process, the internal pressure of the mold will increase significantly; under the effect of pressurization, the surface layer can be significantly improved. The interpenetration effect of the raw material and the core layer raw material at the junction.

Based on the above structure, the elastic surface layer 1 is integrally connected with the interfusion layer 2, and the interfusion layer 2 is integrally connected with the reinforced rigid foam core layer 3, so that the elastic surface layer 1 to The reinforced rigid foamed core layer 3 produces a continuous phase interface between them. The continuous phase interface means that no obvious boundary can be seen. The boundary is not a clear boundary, and the boundary is relatively wide (the entire interfusion layer 2).

The preparation method of the above-mentioned composite board includes the following steps:

a. Coat the release agent in the gravure mold, and then apply the protective paint layer, the top paint layer and the primer layer in sequence; after the paint film is cured, then the raw materials constituting the elastic surface layer 1 are stirred evenly in the first storage tank , Input into the intaglio mold; obtain the elastic surface layer 1 with embossed texture; in this embodiment, the raw materials constituting the elastic surface layer 1 are specifically: 1.2kg toner, 100kg polyether polyol 4110, 50g dibutyl tin dilaurate , 20kg isocyanate, 1.5kgUV-1, 2.0kgUV-196;

b. When the elastic surface layer 1 is not completely cured and still has fluidity, the raw materials constituting the rigid foamed core layer 3 are stirred evenly in the second storage tank, and then input into the intaglio mold; the rigid foamed core layer 3 is formed The specific raw materials are: 148kg polyether polyol YNW-6001A, 7kg deionized water, 40kg heavy calcium, 200kg isocyanate Wanhua MDI-8214, 0.6kg stannous octoate/triethylenediamine (7/10) composite catalyst, 0.2 kg of silicone oil foam stabilizer;

c. When the rigid foamed core layer 3 is not completely cured and still has fluidity, implant the porous skeleton 31 into the raw material of the rigid foamed core layer 3;

d. Mold closing and maturation; during maturation, the mold pressure is controlled at about 4.0MPa; the temperature is controlled within the range of 35℃~55℃;

e. Demoulding to obtain the board.

The density of the composite board in this embodiment is 0.72 g/cm³. Measured in accordance with GB/T-24137, the bending strength of the sheet at a span of 300mm is 15.8MPa; the bending modulus is 560 MPa; the bonding strength of the elastic surface layer 1 is 2.5 MPa; the test method is based on ASTM D 6117-97 , The nail holding force of the board is 890N.

Embodiments of the present invention

Example two

The difference from the first embodiment is that the preparation method of the composite board includes the following steps:

a. Coat the release agent in the gravure mold, and then apply the protective paint layer, the top paint layer and the primer layer in sequence; after the paint film is cured, then the raw materials constituting the elastic surface layer 1 are stirred evenly in the first storage tank , Input into the intaglio mold; obtain the elastic surface layer 1 with embossed texture; in this embodiment, the raw materials constituting the elastic surface layer 1 are specifically: 2kg toner, 100kg polyether polyol YNW-6001A, 80g dibutyl dilauric acid Tin, 41kg isocyanate MDI-5005, 1kgUV-196, 3.0kgUV-315;

e. Demoulding to obtain the board.

The density of the composite board in this embodiment is 0.78 g/cm³. Measured in accordance with GB/T-24137, the bending strength of the sheet at a span of 300mm is 16.0MPa; the bending modulus is 580 MPa; the bonding strength of the elastic surface layer 1 is 2.5 MPa; the test method is in accordance with ASTM D 6117-97 , The nail holding force of the board is 900N.

Example three

a. Coat the release agent in the gravure mold, and then apply the protective paint layer, the top paint layer and the primer layer in sequence; after the paint film is cured, then the raw materials constituting the elastic surface layer 1 are stirred evenly in the first storage tank , Input into the intaglio mold; obtain the elastic surface layer 1 with embossed texture; in this embodiment, the raw materials constituting the elastic surface layer 1 are specifically: 3kg toner, 100kg polytetrahydrofuran ether glycol, 98g amine catalyst triethylenediamine, 36kg isocyanate IPDI, 2.5kgUV-292, 0.5kgUV-315;

b. When the elastic surface layer 1 is not completely cured and still has fluidity, the raw materials constituting the rigid foamed core layer 3 are stirred evenly in the second storage tank, and then input into the intaglio mold; the rigid foamed core layer 3 is formed The specific raw materials are: 148kg polyether polyol 4110, 6.8kg deionized water, 45kg heavy calcium, 200kg isocyanate Wanhua MDI-8214, 0.6kg stannous octoate/triethylenediamine (7/10) composite catalyst, 0.2kg Silicone oil foam stabilizer;

e. Demoulding to obtain the board.

The density of the composite board in this embodiment is 0.76 g/cm³. Measured in accordance with GB/T-24137, the bending strength of the sheet at a span of 300mm is 16.2MPa; the bending modulus is 530 MPa; the bonding strength of the elastic surface layer 1 is 2.5 MPa; the test method is based on ASTM D 6117-97 , The nail holding force of the board is 870N.

Embodiment four

a. Coat the release agent in the gravure mold, and then apply the protective paint layer, the top paint layer and the primer layer in sequence; after the paint film is cured, then the raw materials constituting the elastic surface layer 1 are stirred evenly in the first storage tank , Input into the intaglio mold; obtain the elastic surface layer 1 with embossed texture; in this embodiment, the raw materials constituting the elastic surface layer 1 are specifically: 4kg toner, 100kg polyether polyol 4110, 68g dibutyl tin dilaurate, 42kg isocyanate IPDI, 1.0kgUV-292, 2.5kgUV-315;

b. When the elastic surface layer 1 is not completely cured and still has fluidity, the raw materials constituting the rigid foamed core layer 3 are stirred evenly in the second storage tank, and then input into the intaglio mold; the rigid foamed core layer 3 is formed The specific raw materials are: 130kg polyether polyol 4110, 6.5kg deionized water, 32kg heavy calcium, 175kg isocyanate Wanhua MDI-8214, 0.5kg stannous octoate/triethylenediamine (6/10) composite catalyst, 0.1kg Silicone oil foam stabilizer;

e. Demoulding to obtain the board.

The density of the composite board in this embodiment is 0.75 g/cm³. Measured in accordance with GB/T-24137, the bending strength of the sheet at a span of 300mm is 16.5MPa; the bending modulus is 550 MPa; the bonding strength of the elastic surface layer 1 is 2.5 MPa; the test method is in accordance with ASTM D 6117-97 , The nail holding force of the board is 810N.

Embodiment five

a. Coat the release agent in the gravure mold, and then apply the protective paint layer, the top paint layer and the primer layer in sequence; after the paint film is cured, then the raw materials constituting the elastic surface layer 1 are stirred evenly in the first storage tank , Input into the intaglio mold; obtain the elastic surface layer 1 with embossed texture; in this embodiment, the raw materials constituting the elastic surface layer 1 are specifically: 1.25kg toner, 100kg polyether polyol 4110, 80g stannous octoate, 32kg isocyanate IPDI , 1.0kgUV-581, 2.5kgUV-315;

b. When the elastic surface layer 1 is not completely cured and still has fluidity, the raw materials constituting the rigid foamed core layer 3 are stirred evenly in the second storage tank, and then input into the intaglio mold; the rigid foamed core layer 3 is formed The specific raw materials are: 100kg polyether polyol YWN-6001A, 6.2kg deionized water, 28kg heavy calcium, 150kg isocyanate Wanhua MDI-8214, 0.5kg stannous octoate/triethylenediamine (7/10) composite catalyst, 0.2kg of silicone oil foam stabilizer;

e. Demoulding to obtain the board.

The density of the composite board in this embodiment is 0.72 g/cm³. According to GB/T-24137, the flexural strength of the plate at a span of 300mm is 15.1MPa; the flexural modulus is 570 MPa; the bonding strength of the elastic surface layer 1 is 2.5 MPa; the test is conducted according to the method specified in ASTM D 6117-97 , The nail holding force of the board is 830N.

Example Six

As shown in Figs. 4 and 5, an all-water-based foamed polyurethane board includes an elastic surface layer 1, an enhanced mutual fusion layer 2, an enhanced rigid foam core layer 3, and a skin layer 5 from top to bottom. The reinforced hard foamed core layer 3 and the skinning layer 5 are integrally connected, and a reinforcing net 4 is arranged between them.

As shown in Figure 4, in order to better express the structure of the enhanced inter-fusion layer 2 and its connection with the elastic surface layer 1 and the enhanced rigid foamed core layer 3, the inter-fusion layer 2 is shown in this figure. It has been enlarged, that is, the thickness of the interfusion layer 2 of the actual product is much smaller than the ratio shown in the figure.

The reinforced rigid foamed core layer 3 is a rigid foamed material 32 reinforced by a porous skeleton 31, and the rigid foamed material 32 is filled in the porous structure of the porous skeleton 31. In this embodiment, the porous framework 31 is a honeycomb panel, and the structure of the honeycomb panel is shown in FIGS. 4 and 3. In this embodiment, the material of the honeycomb panel is PP. The rigid foam material 32 is a rigid polyurethane foam; in this embodiment, the density of the rigid polyurethane foam is 0.55 g/cm³.

The reinforced inter-fusion layer 2 is an incompletely solidified and fluid raw material constituting the rigid foaming material 32, and the incompletely solidified raw material constituting the elastic surface layer 1 is mutually soluble under the effect of pressurization, and then An integrated structure formed by curing, and a reinforcing net 4 is pre-laid inside before curing. The pressurization described in this embodiment does not mean providing external pressure, but is combined with the curing process after the mold is closed through the control process. During this process, the internal pressure of the mold will increase significantly; under the effect of pressurization, the surface layer can be significantly improved. The interpenetration effect between the raw material and the core layer raw material at the junction.

Based on the above structure, the elastic surface layer 1 and the reinforced interfusion layer 2 are integrally connected, and the reinforced interfusion layer 2 and the reinforced rigid foam core layer 3 are integrally connected, so that the elasticity A continuous phase interface is created between the surface layer 1 and the reinforced rigid foamed core layer 3. The continuous phase interface means that no obvious boundary can be seen. The boundary is not a clear boundary, and the boundary is relatively wide (the entire enhanced interfusion layer 2).

b. When the elastic surface layer 1 is not completely cured and still has fluidity, first lay a layer of reinforcing net 4, and then mix the raw materials constituting the rigid foam core layer 3 in the second storage tank, and then enter it into the intaglio mold ; The raw materials constituting the rigid foamed core layer 3 are specifically: 148kg polyether polyol YNW-6001A, 7kg deionized water, 40kg heavy calcium, 200kg isocyanate Wanhua MDI-8214, 0.6kg stannous octoate/triethylene diamine (7/10) Composite catalyst, 0.2kg silicone oil foam stabilizer;

d. Lay a layer of reinforcing net 4, and then close the mold for curing; control the mold pressure at about 4.0MPa during the curing process; control the temperature within the range of 35℃~55℃;

e. Demoulding to obtain the board.

The density of the composite board in this embodiment is 0.74 g/cm³. Measured in accordance with GB/T-24137, the bending strength of the sheet at a span of 300mm is 19.3 MPa; the bending modulus is 870 MPa; the bonding strength of the elastic surface layer 1 is 2.8 MPa; the test method is in accordance with ASTM D 6117-97 , The nail holding force of the board is 1385N.

Example Seven

The only difference from the sixth embodiment is that the preparation method of the composite board includes the following steps:

e. Demoulding to obtain the board.

The density of the composite board in this embodiment is 0.80 g/cm³. Measured in accordance with GB/T-24137, the bending strength of the sheet at a span of 300mm is 18.7MPa; the bending modulus is 970 MPa; the bonding strength of the elastic surface layer 1 is 2.9 MPa; the test method is in accordance with ASTM D 6117-97 , The nail holding force of the board is 1325N.

Example eight

The difference from the sixth embodiment is that the preparation method of the composite board includes the following steps:

b. When the elastic surface layer 1 is not completely cured and still has fluidity, first lay a layer of reinforcing net 4, and then mix the raw materials that constitute the rigid foam core layer 3 in the second storage tank, and then enter it into the intaglio mold ; The raw materials constituting the rigid foam core layer 3 are specifically: 148kg polyether polyol 4110, 6.8kg deionized water, 45kg heavy calcium, 200kg isocyanate Wanhua MDI-8214, 0.6kg stannous octoate/triethylene diamine ( 7/10) Composite catalyst, 0.2kg silicone oil foam stabilizer;

e. Demoulding to obtain the board.

The density of the composite board in this embodiment is 0.83 g/cm³. Measured in accordance with GB/T-24137, the bending strength of the sheet at a span of 300mm is 20.2MPa; the bending modulus is 960 MPa; the bonding strength of the elastic surface layer 1 is 3.0 MPa; the test method is based on ASTM D 6117-97 , The nail holding force of the board is 1450N.

Example 9

b. When the elastic surface layer 1 is not completely cured and still has fluidity, first lay a layer of reinforcing net 4, and then mix the raw materials constituting the rigid foam core layer 3 in the second storage tank, and then enter it into the intaglio mold ; The raw materials constituting the rigid foamed core layer 3 are specifically: 130kg polyether polyol 4110, 6.5kg deionized water, 32kg heavy calcium, 175kg isocyanate Wanhua MDI-8214, 0.5kg stannous octoate/triethylene diamine ( 6/10) Composite catalyst, 0.1kg silicone oil foam stabilizer;

e. Demoulding to obtain the board.

The density of the composite board in this embodiment is 0.80 g/cm³. Measured in accordance with GB/T-24137, the bending strength of the sheet at a span of 300mm is 19.6MPa; the bending modulus is 890 MPa; the bonding strength of the elastic surface layer 1 is 2.8MPa; the test method is based on ASTM D 6117-97 , The nail holding force of the board is 1230N.

Example ten

b. When the elastic surface layer 1 is not completely cured and still has fluidity, first lay a layer of reinforcing net 4, and then mix the raw materials constituting the rigid foam core layer 3 in the second storage tank, and then enter it into the intaglio mold ; The raw materials constituting the rigid foamed core layer 3 are specifically: 100kg polyether polyol YWN-6001A, 6.2kg deionized water, 28kg heavy calcium, 150kg isocyanate Wanhua MDI-8214, 0.5kg stannous octoate/triethylene two Amine (7/10) composite catalyst, 0.2kg silicone oil foam stabilizer;

e. Demoulding to obtain the board.

The density of the composite board in this embodiment is 0.78 g/cm³. Measured in accordance with GB/T-24137, the bending strength of the sheet at a span of 300mm is 20.6MPa; the bending modulus is 780 MPa; the bonding strength of the elastic surface layer 1 is 2.9MPa; the test method is in accordance with ASTM D 6117-97 , The nail holding force of the board is 1150N.

Comparative example one

According to GB2445714B, a polyurethane board is prepared. Measured according to GB/T-24137, the bending strength of the sheet at a span of 300mm is 9.28MPa; the bending modulus is 356.8MPa; the bonding strength of the elastic surface layer 1 is 2.2MPa; the test is conducted according to the method specified in ASTM D 6117-97 , The nail holding force of the board is 530N.

According to GB/T-24137, the examples and comparative examples are measured, and the data results are as follows:

Claims

An all-water-based foamed polyurethane board, comprising an elastic surface layer (1) and a reinforced hard foamed core layer (3); characterized in that: the reinforced foamed core layer (3) is a porous skeleton (31) Reinforced rigid foam material (32), said rigid foam material (32) is filled at least in the porous structure of said porous skeleton (31); said rigid foam material (32) is made of Polyol and isocyanate are the main raw materials, and water is the rigid polyurethane foam formed by the blowing agent.
The fully water-based foamed polyurethane board according to claim 1, wherein the raw material of the rigid foam material (32) comprises the following components by mass: polyether polyol/polyester polyol 40-60, isocyanate 40-60, filler 10-30, coupling agent 3-6, flame retardant 8-16, pigment 1-6.
The fully water-based foamed polyurethane board according to claim 1, wherein the porous skeleton (31) is a support board with a honeycomb structure.
The all-water-based foamed polyurethane board according to claim 1, wherein the elastic surface layer (1) is made of non-foamed polyurethane material, and a wood texture pattern is formed on the surface.
The all-water-based foamed polyurethane sheet according to claim 1, characterized in that it further comprises an inter-fusion layer (2), and the inter-fusion layer (2) is arranged on the elastic surface layer (1) and The reinforced foam core layer (3); the inter-fusion layer (2) is an incompletely cured and fluid raw material that constitutes the rigid foam material (32), and is not completely cured The raw materials constituting the elastic surface layer (1) penetrate each other and then solidify to form a transition layer; and the elastic surface layer (1) is integrally connected with the inter-fusion layer (2), and the inter-fusion layer (2) It is integrally connected with the reinforced rigid foamed core layer (3), so that a continuous phase interface is formed between the elastic surface layer (1) and the reinforced rigid foamed core layer (3).
A water-based foamed polyurethane sheet according to claim 5, characterized in that: measured according to GB/T-24137, the sheet has a flexural strength of 15.0 MPa or more at a span of 300 mm, and a flexural modulus of 500 MPa or more, the bonding strength of the elastic surface layer (1) of the board is more than 2.5 MPa; tested according to the method specified in ASTM D 6117-97, the nail holding force on the board surface is more than 500N; the density of the board is 0.5~0.9 g/cm³.
The all-water-based foamed polyurethane board according to claim 2, characterized in that it further comprises a reinforcing net (4), and the reinforcing net (4) is distributed in the inter-fusion layer (2).
The all-water-based foamed polyurethane board according to claim 7, characterized in that: the bottom of the board is also formed with a skin layer (5) integrally connected with the reinforced hard foamed core layer (3). ), the reinforced net (4) is also arranged between the reinforced hard foamed core layer (3) and the skinning layer (5).
The all-water-based foamed polyurethane board according to claim 7, characterized in that: the material of the reinforcing mesh (4) is selected from metal materials, inorganic non-metallic materials, polymer organic materials, plant fibers or their Composite materials.
The all-water-based foamed polyurethane sheet according to claim 9, characterized in that: measured according to GB/T-24137, the sheet has a bending strength of 18.0 MPa or more at a span of 300 mm, and a bending modulus of 780 MPa or more, the bonding strength of the elastic surface layer (1) of the board is more than 2.8 MPa; tested according to the method specified in ASTM D 6117-97, the nail holding force of the board surface is more than 1100N; the density of the board is 0.5~0.9g /cm³.
A preparation method of an all-water-based foamed polyurethane board includes the following steps:

a. Coat the release agent in the gravure mold, and then input the raw materials constituting the elastic surface layer (1) into the gravure mold to obtain the elastic surface layer (1) with embossed wood texture;

b. When the elastic surface layer (1) is not completely cured and still has fluidity, input the raw materials constituting the rigid foam core layer (3) into the intaglio mold;

c. When the rigid foamed core layer (3) is not completely cured and still has fluidity, implant the porous skeleton (31) into the raw material of the rigid foamed core layer (3);

d. Clamping and curing;

e. Demoulding to obtain the board.
The method for preparing an all-water-based foamed polyurethane board according to claim 11, characterized in that: in step b, when the elastic surface layer (1) is not completely cured and still has fluidity, a layer of reinforcing mesh is first laid (4), then input the raw materials constituting the rigid foamed core layer (3) into the mold; in step d, a layer of reinforcing mesh (4) is laid first, and then the mold is closed and matured.
The method for preparing an all-water-based foamed polyurethane sheet according to claim 11, characterized in that: in step a, after the release agent is coated in the mold, the protective paint layer and the top paint layer are sequentially applied And the primer layer; after the paint film is cured, the raw materials constituting the elastic surface layer (1) are input into the mold.