Plate veneering composite adhesive and preparation method thereof

Abstract

The invention relates to a board veneering composite adhesive and a preparation method thereof. The board veneering composite adhesive comprises a polyol main agent and a polyisocyanate curing agent, the polyol main agent is mainly prepared from the following components in parts by mass: # imgabs0 #. According to the invention, the defect that the technical blank exists when the existing two-component solvent-free polyurethane adhesive based on polyol and polyisocyanate materials is not introduced temporarily in the manufacturing field of veneer artificial boards is overcome; the polyol main agent only containing two conventional materials of castor oil and powder is adopted, chemical modification and processing are not needed, the polyol main agent can be used by simply mixing the polyol main agent with the polyisocyanate curing agent according to a preferable proportion, and the polyol main agent has the advantages of high efficiency, convenience, no investment and transformation of any new equipment during use and low cost. The adhesive is suitable for composite bonding of an artificial board substrate and a common veneering material, and has the advantage of high bonding strength.

Description

Technical Field

[0001] The invention relates to a plate veneer composite adhesive and a preparation method thereof, and is applied in the field of plate veneer composite adhesive production. Background Art

[0002] In order to improve the decorative beauty of various types of artificial boards such as density boards, multi-layer boards, and blockboards, the furniture board industry has developed various paint-free veneer artificial boards, that is, various types of decorative surface materials (commonly used veneer materials) such as solid wood veneer, technical veneer, triamine paper composite surface, kraft paper composite surface, etc. are pasted on the surface of various artificial board substrates (multi-layer boards, wood boards, solid wood boards, etc.), and various adhesives for composite bonding of artificial board substrates and surface materials have also been gradually developed. At present, there are four main types of adhesives used in the board veneer industry: water-based adhesives (conventional vinegar-propylene water-based adhesives, water-based polyurethanes, etc.), trialdehyde resin adhesives, EVA hot melt adhesives, and moisture-curing single-component polyurethane hot melt adhesives. Water-based adhesives are relatively environmentally friendly, but the water resistance of the adhesive layer is usually poor. In order to improve the water resistance, the emulsion resin usually needs to be chemically modified or cross-linked, and the production and manufacturing process is relatively complicated; trialdehyde resin glue has the defect of formaldehyde release; EVA hot melt adhesive and moisture-curing one-component polyurethane hot melt adhesive are green and environmentally friendly, and have high production efficiency, but this type of adhesive requires special heating equipment during production and use, and consumes a lot of energy. Downstream companies need to invest in new sizing equipment when using glue, which is expensive and not conducive to promotion.

[0003] Two-component solvent-free polyurethane adhesives based on polyols and polyisocyanates are green and environmentally friendly, have high bonding strength, good water resistance, good heat resistance, good bonding and sealing effects, and are easy to construct. They are often used as building structural adhesives, sealants, potting adhesives, etc. For example, in the field of solar backplane manufacturing, they are often used for bonding and sealing of multi-layer plastic films such as PVDF films, PET films, and EVA films; in the field of exterior wall insulation decorative board manufacturing, they are often used for structural bonding of calcium silicate boards with insulation materials such as polystyrene boards and rock wool; in the field of road and bridge repair, they are often used for caulking and potting sealing of gaps. Summary of the invention

[0004] In order to overcome the disadvantage that the existing two-component solvent-free polyurethane adhesive based on polyol and polyisocyanate materials has not been introduced in the manufacturing field of clothing surface artificial boards, and there is a technical gap, the present invention provides a board veneer composite adhesive and a preparation method thereof, which adopts a polyol main agent containing only two types of conventional materials, castor oil and powder, and does not require chemical modification and processing. It can be used by simply mixing with a polyisocyanate curing agent in a preferred proportion. It is efficient and convenient, does not require any new equipment investment and modification when used, is suitable for the composite bonding of artificial board substrates and commonly used veneer materials, and has the advantages of high bonding strength.

[0005] The technical solution of the present invention is as follows:

[0006] A composite adhesive for panel veneer, comprising a polyol main agent and a polyisocyanate curing agent,

[0007] The polyol main agent is mainly prepared from the following components according to the following mass ratio:

[0008]

[0009]

[0010] The board veneer composite adhesive of the present application adopts a polyol main agent containing only two types of conventional materials, castor oil and powder, without chemical modification and processing, and can be used by simply mixing with a polyisocyanate curing agent in a preferred ratio, with high efficiency and convenience, without the investment and transformation of any new equipment when using, and is suitable for the composite bonding of artificial board substrates and commonly used veneer materials and the advantages of high bonding strength. The polyol main agent only includes two types of conventional materials, castor oil and powder, without any chemical modification and processing of castor oil (resin), and the production and manufacturing of the polyol main agent is more efficient and convenient than the adhesive prepared by materials such as various modified polyols or modified polyurethane prepolymers used in existing use. When using, it is only necessary to use the existing roller coating glue coating equipment of the board enterprise, without any equipment investment and transformation costs, which is conducive to promotion in the industry. The board veneer composite adhesive (two-component solvent-free polyurethane adhesive) is a kind of adhesive with high strength and high viscosity, and its main feature is that it can form an independent structure after curing, without the need for external support or fiber reinforcement. It has excellent performance characteristics and is innovatively introduced into the field of veneer artificial board manufacturing. After research and testing, it is found that the board veneer composite adhesive material can effectively achieve a firm bond between the artificial board substrate (multi-layer board, wood board, solid wood board and other substrates) and the decorative surface materials such as solid wood veneer, technical wood veneer, triamine paper-non-woven fabric surface, and the artificial board substrate and the decorative surface material of the prepared veneer artificial board can meet the Class I immersion peeling standard in GB / T 17657-2013 "Physical and Chemical Properties and Test Methods of Artificial Boards and Veneer Artificial Boards". This case combines the advantages of high bonding strength, high water resistance, convenient production and manufacturing, and simple construction and application of two-component solvent-free polyurethane adhesives, and creatively introduces it into the field of composite veneer bonding of veneer artificial boards (density boards, multi-layer boards, wood boards, solid wood boards, etc.), solving the technical problems that cannot be effectively taken into account in the existing board veneer composite adhesives in terms of water resistance, convenient production and manufacturing process, no formaldehyde release or additional equipment investment costs, which is conducive to large-scale industrial production.

[0011] The castor oil is refined first-grade castor oil.

[0012] The mesh size of the talcum powder is 700-900 meshes.

[0013] The purity of the calcium oxide is ≥95% and the whiteness is ≥85.

[0014] The mesh size of the heavy calcium carbonate powder is 750-850 meshes.

[0015] The polyisocyanate curing agent is polymerized diphenylmethane diisocyanate.

[0016] The preferred polyisocyanate curing agent is readily available and low in cost.

[0017] The board veneer composite adhesive is prepared by mixing a polyol main agent and a polyisocyanate curing agent in a mass ratio of 3.5-4.5:1 when in use.

[0018] The method for using the board veneer composite adhesive is simple. When using, the prepared main agent and curing agent need only be stirred and mixed evenly according to a preferred ratio, and then the adhesive can be used for gluing the surface of the substrate.

[0019] The method for preparing the board veneer composite adhesive includes a method for preparing a polyol main agent, and the method for preparing the polyol main agent includes the following steps performed in sequence:

[0020] (1) Castor oil is added into a mixer, the mixer is started, the speed is adjusted to 400-500 rpm, talcum powder and calcium oxide are continuously added, and finally, heavy calcium carbonate powder is slowly added;

[0021] (2) Then, the rotation speed is increased to 700-800 rpm, and stirring is continued until the mixture is uniformly dispersed, thereby obtaining the polyol main agent.

[0022] The preparation process steps of the board veneer composite adhesive of the present application are extremely simple, and only simple dispersing equipment is required for production, which is low in cost and easy to promote.

[0023] The board veneer composite adhesive and its preparation method also include mixing the polyol main agent and the polyisocyanate curing agent evenly at a mass ratio of 3.5-4.5:1 during use to obtain the board veneer composite adhesive.

[0024] The method for using the board veneer composite adhesive is simple. When using, the prepared main agent and curing agent need only be stirred and mixed evenly according to a preferred ratio, and then the adhesive can be used for gluing the surface of the substrate.

[0025] Compared with the prior art, the present invention has the following advantages:

[0026] 1) The board veneer composite adhesive of the present application uses a polyol main agent containing only two types of conventional materials, castor oil and powder, and does not require chemical modification and processing. It can be used by simply mixing with a polyisocyanate curing agent in a preferred ratio. It is efficient and convenient, does not require any investment or modification of new equipment when used, is suitable for composite bonding of artificial board substrates and commonly used veneer materials, and has the advantages of high bonding strength;

[0027] 2) The raw materials of the composite glue for the board veneer are widely available, green and environmentally friendly, with a simple preparation process and low requirements for production equipment, and are suitable for large-scale industrial production; and the existing roller glue equipment of the board enterprise can be used for glue application, without the need for new equipment investment and modification;

[0028] 3) The method for using the board veneer composite adhesive is simple. When using, the prepared main agent and curing agent need only be stirred and mixed evenly according to a preferred ratio, and then the adhesive can be used for gluing the surface of the substrate;

[0029] 4) The preparation process steps of the board veneer composite adhesive of the present application are extremely simple, and only simple dispersing equipment is required for production, which is low in cost and easy to promote. DETAILED DESCRIPTION

[0030] The technical solution of the present invention will be clearly and completely described below in conjunction with specific embodiments.

[0031] Example 1

[0032] The composite adhesive for veneer of a plate material of the present invention comprises a polyol main agent and a polyisocyanate curing agent.

[0033] The polyol main agent is mainly prepared from the following components according to the following mass ratio:

[0034]

[0035] The castor oil is refined first-grade castor oil.

[0036] The mesh number of the talcum powder is 800 meshes.

[0037] The purity of the calcium oxide is ≥95% and the whiteness is ≥85.

[0038] The mesh number of the heavy calcium carbonate powder is 800 meshes.

[0039] The polyisocyanate curing agent is polymerized diphenylmethane diisocyanate.

[0040] The board veneer composite adhesive is prepared by mixing a polyol main agent and a polyisocyanate curing agent in a mass ratio of 4:1 when in use.

[0041] The method for preparing the board veneer composite adhesive includes a method for preparing a polyol main agent, and the method for preparing the polyol main agent includes the following steps performed in sequence:

[0042] (1) Castor oil is added into a mixer, the mixer is started, the speed is adjusted to 450 rpm, talcum powder and calcium oxide are continuously added, and finally, heavy calcium carbonate powder is slowly added;

[0043] (2) Then, the rotation speed is increased to 750 rpm, and stirring is continued until the mixture is uniformly dispersed, thereby obtaining the polyol main agent.

[0044] The board veneer composite adhesive and its preparation method also include mixing the polyol main agent and the polyisocyanate curing agent in a mass ratio of 4:1 to obtain the board veneer composite adhesive.

[0045] Example 2

[0046] The composite adhesive for veneer of a plate material of the present invention comprises a polyol main agent and a polyisocyanate curing agent.

[0047] The polyol main agent is mainly prepared from the following components according to the following mass ratio:

[0048]

[0049] The castor oil is refined first-grade castor oil.

[0050] The mesh number of the talcum powder is 700 meshes.

[0051] The purity of the calcium oxide is ≥95% and the whiteness is ≥85.

[0052] The mesh number of the heavy calcium carbonate powder is 850 meshes.

[0053] The polyisocyanate curing agent is polymerized diphenylmethane diisocyanate.

[0054] The board veneer composite adhesive is prepared by mixing a polyol main agent and a polyisocyanate curing agent in a mass ratio of 3.5:1 when in use.

[0055] The method for preparing the board veneer composite adhesive includes a method for preparing a polyol main agent, and the method for preparing the polyol main agent includes the following steps performed in sequence:

[0056] (1) Castor oil is added into a mixer, the mixer is started, the speed is adjusted to 500 rpm, talcum powder and calcium oxide are continuously added, and finally, heavy calcium carbonate powder is slowly added;

[0057] (2) Then, the rotation speed is increased to 700 rpm, and stirring is continued until the mixture is uniformly dispersed, thereby obtaining the polyol main agent.

[0058] The board veneer composite adhesive and its preparation method also include mixing the polyol main agent and the polyisocyanate curing agent in a mass ratio of 3.5:1 during use to obtain the board veneer composite adhesive.

[0059] Example 3

[0060] The composite adhesive for veneer of a plate material of the present invention comprises a polyol main agent and a polyisocyanate curing agent.

[0061] The polyol main agent is mainly prepared from the following components according to the following mass ratio:

[0062]

[0063] The castor oil is refined first-grade castor oil.

[0064] The mesh number of the talcum powder is 900 meshes.

[0065] The purity of the calcium oxide is ≥95% and the whiteness is ≥85.

[0066] The mesh number of the heavy calcium carbonate powder is 750 mesh.

[0067] The polyisocyanate curing agent is polymerized diphenylmethane diisocyanate.

[0068] The board veneer composite adhesive is prepared by mixing a polyol main agent and a polyisocyanate curing agent in a mass ratio of 4.5:1 when in use.

[0069] The method for preparing the board veneer composite adhesive includes a method for preparing a polyol main agent, and the method for preparing the polyol main agent includes the following steps performed in sequence:

[0070] (1) Castor oil is added into a mixer, the mixer is started, the speed is adjusted to 400 rpm, talcum powder and calcium oxide are continuously added, and finally, heavy calcium carbonate powder is slowly added;

[0071] (2) Then, the rotation speed is increased to 800 rpm, and stirring is continued until the mixture is uniformly dispersed, thereby obtaining the polyol main agent.

[0072] The board veneer composite adhesive and its preparation method also include mixing the polyol main agent and the polyisocyanate curing agent in a mass ratio of 4.5:1 during use to obtain the board veneer composite adhesive.

[0073] Example 4

[0074] The composite adhesive for veneer of a plate material of the present invention comprises a polyol main agent and a polyisocyanate curing agent.

[0075] The polyol main agent is mainly prepared from the following components according to the following mass ratio:

[0076]

[0077] The castor oil is refined first-grade castor oil.

[0078] The mesh number of the talcum powder is 900 meshes.

[0079] The purity of the calcium oxide is ≥95% and the whiteness is ≥85.

[0080] The mesh number of the heavy calcium carbonate powder is 750 mesh.

[0081] The polyisocyanate curing agent is polymerized diphenylmethane diisocyanate.

[0082] The board veneer composite adhesive is prepared by mixing a polyol main agent and a polyisocyanate curing agent in a mass ratio of 4.5:1 when in use.

[0083] The method for preparing the board veneer composite adhesive includes a method for preparing a polyol main agent, and the method for preparing the polyol main agent includes the following steps performed in sequence:

[0084] (1) Castor oil is added into a mixer, the mixer is started, the speed is adjusted to 400 rpm, talcum powder and calcium oxide are continuously added, and finally, heavy calcium carbonate powder is slowly added;

[0085] (2) Then, the rotation speed is increased to 800 rpm, and stirring is continued until the mixture is uniformly dispersed, thereby obtaining the polyol main agent.

[0086] The board veneer composite adhesive and its preparation method also include mixing the polyol main agent and the polyisocyanate curing agent in a mass ratio of 4.5:1 during use to obtain the board veneer composite adhesive.

[0087] Example 5

[0088] The composite adhesive for veneer of a plate material of the present invention comprises a polyol main agent and a polyisocyanate curing agent.

[0089] The polyol main agent is mainly prepared from the following components according to the following mass ratio:

[0090]

[0091] The castor oil is refined first-grade castor oil.

[0092] The mesh number of the talcum powder is 700 meshes.

[0093] The purity of the calcium oxide is ≥95% and the whiteness is ≥85.

[0094] The mesh number of the heavy calcium carbonate powder is 750 mesh.

[0095] The polyisocyanate curing agent is polymerized diphenylmethane diisocyanate.

[0096] The board veneer composite adhesive is prepared by mixing a polyol main agent and a polyisocyanate curing agent in a mass ratio of 4:1 when in use.

[0097] The method for preparing the board veneer composite adhesive includes a method for preparing a polyol main agent, and the method for preparing the polyol main agent includes the following steps performed in sequence:

[0098] (1) Castor oil is added into a mixer, the mixer is started, the speed is adjusted to 500 rpm, talcum powder and calcium oxide are continuously added, and finally, heavy calcium carbonate powder is slowly added;

[0099] (2) Then, the rotation speed is increased to 800 rpm, and stirring is continued until the mixture is uniformly dispersed, thereby obtaining the polyol main agent.

[0100] The board veneer composite adhesive and its preparation method also include mixing the polyol main agent and the polyisocyanate curing agent in a mass ratio of 4:1 to obtain the board veneer composite adhesive.

[0101] Experimental data:

[0102] When used, in each embodiment, the prepared polyol main agent and curing agent are stirred and mixed in a preferred ratio at room temperature of 25°C to obtain a board veneer composite adhesive, that is, the surface of the sanded artificial board substrate is glued by a roller glue machine, and the glue amount is 160g / m 2 After the sanding of the artificial board substrate, the decorative skin is covered with glue, and the decorative skin and the artificial board substrate are cold pressed for 6 hours for preliminary bonding within 40 minutes, and then the pressure is released and placed at room temperature for curing for 2 days. Then, the immersion peeling performance determination method in GB / T17657-2013 "Test Methods for Physical and Chemical Properties of Artificial Boards and Faced Artificial Boards" can be used for experiments. Specific testing method: After boiling in boiling water for 4 hours, take out and place in a 63℃ drying oven for 20 hours, boil in boiling water for 4 hours, take out and place in a 63℃ drying oven for 3 hours, and observe.

[0103] Table 1 Artificial board substrate and decorative surface used in each embodiment

[0104] Artificial board substrate Decorative leather Example 1 Eucalyptus multilayer board Solid wood skin Example 2 Poplar board Technology veneer Example 3 Poplar board Triamine paper-nonwoven composite material Example 4 Eucalyptus veneer Technology veneer Example 5 Wood board Triamine paper-nonwoven composite material

[0105] The test results are shown in Table 2:

[0106] Table 2 Results of immersion stripping experiments on the veneer panels prepared in Examples 1-5

[0107] Test Results Example 1 There is no peeling or delamination of the glue layer between the veneer layer and the eucalyptus multilayer board substrate Example 2 The glue layer between the technical wood veneer and the poplar board substrate has no peeling or delamination phenomenon Example 3 There is no peeling or delamination of the adhesive layer between the triamine paper-nonwoven fabric surface layer and the poplar board substrate Example 4 There is no peeling or delamination of the glue layer between the technical wood veneer layer and the eucalyptus board substrate Example 5 There is no peeling or delamination of the adhesive layer between the triamine paper-nonwoven fabric surface and the wood board substrate

[0108] It can be seen that the board veneer composite adhesive provided by the present application can be effectively used for the composite bonding of artificial board substrates such as eucalyptus multilayer board, woodworking board, solid wood board (poplar board) and common veneer materials such as solid wood veneer, technical wood veneer, triamine paper-non-woven composite material, etc. The prepared veneer artificial board can meet the Class I immersion peeling test standard in GB / T 17657-2013 "Test Methods for Physical and Chemical Properties of Artificial Boards and Veneer Artificial Boards", and has high bonding strength. In addition, the raw materials for the production of the veneer composite adhesive are widely available, green and environmentally friendly, and simple to produce and manufacture, which is suitable for large-scale promotion and use in the field of artificial board veneer.

Claims

1. A composite adhesive for veneer of sheet materials, characterized by: Including polyol main agent and polyisocyanate curing agent, The polyol main agent is mainly prepared from the following components according to the following mass ratio:

2. The sheet veneer composite adhesive according to claim 1, characterized in that: The castor oil is refined first-grade castor oil.

3. The sheet veneer composite adhesive according to claim 1, characterized in that: The mesh size of the talcum powder is 700-900 meshes.

4. The sheet veneer composite adhesive according to claim 1, characterized in that: The purity of the calcium oxide is ≥95% and the whiteness is ≥85.

5. The sheet veneer composite adhesive according to claim 1, characterized in that: The mesh size of the heavy calcium carbonate powder is 750-850 mesh.

6. The sheet veneer composite adhesive according to claim 1, characterized in that: The polyisocyanate curing agent is polymerized diphenylmethane diisocyanate.

7. The sheet veneer composite adhesive according to claim 1, characterized in that: The board veneer composite adhesive is prepared by mixing a polyol main agent and a polyisocyanate curing agent in a mass ratio of 3.5-4.5:1 when in use.

8. The method for preparing the sheet veneer composite adhesive according to any one of claims 1 to 7, characterized in that: The invention relates to a method for preparing a polyol main agent, wherein the method for preparing the polyol main agent comprises the following steps performed in sequence: (1) Castor oil is added into a mixer, the mixer is started, the speed is adjusted to 400-500 rpm, talcum powder and calcium oxide are continuously added, and finally, heavy calcium carbonate powder is slowly added; (2) Then, the rotation speed is increased to 700-800 rpm, and stirring is continued until the mixture is uniformly dispersed, thereby obtaining the polyol main agent.

9. The sheet veneer composite adhesive and preparation method thereof according to claim 8, characterized in that: The method also includes uniformly mixing the polyol main agent and the polyisocyanate curing agent at a mass ratio of 3.5-4.5:1 during use to obtain the board veneer composite adhesive.

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