CN112917618B - Low-formaldehyde high-quality solid wood composite floor and processing technology - Google Patents

Abstract

The invention discloses a low-formaldehyde high-quality solid wood composite floor and a processing technology thereof, and the solid wood composite floor comprises a substrate (1), wherein the back surface of the substrate (1) is connected with a back plate (3) through first thermosetting adhesive film paper (2), and the front surface of the substrate (1) is connected with a panel (5) through second thermosetting adhesive film paper (4); the base plate (1) comprises a core plate (101), and the front surface and the back surface of the core plate (101) are respectively provided with a single plate (102). The invention can effectively relieve the cracking problem of the surface plate when the whole core plate is used, and reduce the formaldehyde emission of the floor; on the basis, stable gluing of MDI formaldehyde-free glue can be realized by optimizing the processing technology, compared with the existing gluing technology using urea formaldehyde glue or formaldehyde-free glue, the method can conveniently control the technology and reduce the required gluing procedures, and further has the characteristics of high structural stability, good environmental protection effect and convenient processing.

Description

A low-aldehyde high-quality solid wood composite floor and its processing technology

technical field

The invention relates to a solid wood composite floor, in particular to a low-aldehyde high-quality solid wood composite floor.

Background technique

Traditional solid wood composite flooring is divided into rib core flooring and whole wood core flooring. Compared with whole wood core flooring, rib core flooring has better structural stability and is less prone to deformation, cracking and delamination, so it is more widely used. selected by the user. However, the disadvantage of the rib core floor is that after the floor is used for a long time, the problem of "rib marks" is prone to appear on the surface, which makes it difficult to meet the needs of users. Therefore, how to improve the structural strength and stability of the whole wood core floor so that it can replace the rib core floor has become a problem that floor manufacturers need to solve urgently.

On the other hand, at present, each layer of veneers in solid wood composite flooring is bonded by urea-formaldehyde glue, and once the urea-formaldehyde glue is applied, formaldehyde will be released, which will cause pollutants in the subsequent process and use of the floor. The emission standard of the floor is lowered. In order to solve this problem, although zero-emission formaldehyde-free adhesives have been developed on the market, since formaldehyde-free adhesives have high requirements on the control accuracy of process parameters in the floor gluing process, it is easy to cause its adhesion to be stable due to insufficient control The decline of the property makes it difficult to promote the formaldehyde-free glue in the composite floor processing technology.

In addition, the way of gluing the floor with urea-formaldehyde glue or formaldehyde-free glue requires the floor to be divided into multiple stations to complete the pre-pressing and hot-pressing processes during the processing process, and the current conventional pre-pressing time is 60min-90min in summer. It takes 90min-120min in winter, which takes a long time; thereby reducing the processing efficiency of the floor and increasing the complexity of the process.

Therefore, the existing solid wood composite floor has the problems of low structural stability, poor environmental protection effect and difficult processing.

Contents of the invention

The object of the present invention is to provide a low-aldehyde high-quality solid wood composite floor and its processing technology. It has the characteristics of high structural stability, good environmental protection effect and convenient processing.

The technical solution of the present invention: a low-aldehyde high-quality solid wood composite floor, including a substrate, the back of the substrate is connected to the backboard through the first heat-cured adhesive film, and the front of the substrate is connected to the panel through the second heat-cured adhesive film; The base plate includes a core board, and the front and back sides of the core board are provided with single boards.

In the aforementioned low-formaldehyde high-quality solid wood composite floor, the front and back sides of the core board are connected to the veneers through an MDI formaldehyde-free adhesive layer.

In the aforementioned low-aldehyde high-quality solid wood composite floor, the thickness of the core board is 6-8mm, and the thickness of the veneer is 2-3mm.

In the aforementioned low-aldehyde high-quality solid wood composite floor, the thickness of the backboard is 0.7-1 mm, and the thickness of the face plate is 1-2.5 mm.

In the aforesaid low-aldehyde high-quality solid wood composite floor, the wood grain directions of the core board, the face plate and the back board are all longitudinal, and the wood grain directions of the two veneers are all horizontal.

In the aforesaid low-aldehyde high-quality solid wood composite floor, the first heat-cured adhesive film paper and the second heat-cured adhesive film paper are both heat-cured adhesive film papers, and the first heat-cured adhesive film paper and the second heat-cured adhesive film paper The thickness of the film paper is 0.6-0.7mm.

A kind of processing technology of aforementioned low-formaldehyde high-quality solid wood composite flooring, comprises the following steps:

a. After coating the surface of both sides of the core board with MDI formaldehyde-free glue, glue and pre-press the two veneers to obtain the A substrate;

b. Assemble the backplane, the first heat-cured adhesive film, the A substrate, the second heat-cured adhesive film, and the panel from bottom to top in sequence, and then heat and press them for 1 to 2 minutes. Minutes, get B plain board;

c. Cool the plain board B naturally and stack it for 3 to 7 days to obtain the plain board C;

d. Carry out slotting and surface painting on the C plain board in turn to obtain the finished floor.

In the above-mentioned processing technology of low-aldehyde high-quality solid wood composite flooring, the gluing pre-pressing temperature in the step a is normal temperature, and the gluing pre-pressing time is 30-60 minutes.

In the processing technology of aforesaid low-formaldehyde high-quality solid wood composite flooring, the concrete steps of described step a are:

a1. Insulate the core board at 70°C for 5-10 minutes to obtain the A1 core board;

a2. Heat the MDI formaldehyde-free glue to 50-60°C and apply it on both sides of the A1 core board to obtain the A2 core board;

a3. After adhering the two veneers to the upper and lower sides of the A2 core board respectively, perform gluing and pre-pressing at room temperature, and the pre-pressing time is 30 to 60 minutes to obtain the A substrate.

In the above-mentioned processing technology of low-aldehyde high-quality solid wood composite flooring, in the step b, the plain board after the blank assembly is put into a hot press, and the plain board is heated and pressed by the hot press, and when the plain board After the temperature is raised to 108-116°C, the hot pressing is completed.

Compared with the prior art, the present invention has the following characteristics:

(1) The present invention replaces the existing urea-formaldehyde glue with the cooperation of the first heat-cured film paper and the second heat-cured film paper to glue the substrate, backboard and panel, and can glue the multi-channel required by the original floor The process is reduced to two processes of forming blanks and hot pressing, which effectively reduces the difficulty of processing the floor and improves its gluing efficiency, making the present invention more than 8 times more efficient than the existing gluing process using liquid glue; and because The first heat-cured adhesive film paper and the second heat-cured adhesive film paper are both solid structures in a natural state, thereby being able to avoid the formaldehyde release of the floor before and after hot pressing and during daily use, and improving the environmental protection effect of the present invention;

(2) By using heat-cured adhesive film paper for gluing, the heat-cured adhesive film paper can also be melted to form a liquid glue during the heating and pressing process, and then penetrate into the pores of the wood, and then be processed at a temperature of 108-116 ° C. Curing to form glue nails, so as to effectively improve the gluing effect on the substrate, backplane and panel; under this process, because the heat-cured adhesive film paper only becomes liquid and releases formaldehyde during the heating and pressing process, it is effectively convenient for manufacturers to control formaldehyde. collection and processing, further improving the environmental protection effect of the present invention;

(3) By criss-crossing the texture directions of each board body, it is possible to make each layer board body restrain each other when deformed, thereby reducing the deformation amount of the whole floor and improving the structural stability of the present invention; by combining the core board and the back board If the texture direction of the panel and the panel are both set to be vertical, the deformation coefficients of the three can be relatively consistent, thereby reducing the internal stress generated when the floor is deformed, and reducing the chance of cracking of the backplane and panel;

(4) By using MDI formaldehyde-free glue to glue the core board and the veneers on both sides, the formaldehyde emission of the floor can be further reduced; on this basis, through the heat preservation process of coating the core board with MDI formaldehyde-free glue, it can Keep the MDI formaldehyde-free glue in a liquid state during the coating and initial pre-pressing process, so that the MDI formaldehyde-free glue can fully penetrate into the wood pores, and by pre-pressing the core board at room temperature for 30-60 minutes, it can make the MDI formaldehyde-free glue. The aldehyde glue is completely cured during the pre-pressing process, thereby effectively improving the bonding stability of the core board and realizing the application of MDI formaldehyde-free glue in the whole core board process;

(5) By optimizing the pre-pressing process of MDI formaldehyde-free glue, the present invention only needs the pre-pressing process to realize the gluing effect on the core board, thereby effectively reducing its thermal pressure compared with the pressing process of the existing urea-formaldehyde glue process, which reduces the process complexity and process cost of the present invention, and facilitates the processing of manufacturers;

(6) Through the above-mentioned cooperation, the formaldehyde release amount of the floor of ^the present invention can be made to reach below 0.029mg/m in daily use, which is far below the E1 grade index stipulated in the standard;

Therefore, the present invention has the characteristics of high structural stability, good environmental protection effect and convenient processing.

Description of drawings

Fig. 1 is a structural schematic diagram of the present invention.

The marks in the drawings are: 1-substrate, 2-first heat-cured adhesive film, 3-backboard, 4-second heat-cured adhesive film, 5-panel, 101-core board, 102-single board, 103-MDI formaldehyde-free adhesive layer.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings and embodiments, but not as a basis for limiting the present invention.

Example 1. A kind of low-formaldehyde high-quality solid wood composite floor, the composition is as shown in Figure 1, including a substrate 1, the back of the substrate 1 is connected with a backboard 3 through the first heat-curing adhesive film 2, and the front of the substrate 1 is connected with the second heat-curing glue. The film paper 4 is connected with the panel 5; the substrate 1 includes a core board 101, and the front and back of the core board 101 are provided with veneers 102.

The front and back of the core board 101 are connected to the veneer 102 through the MDI formaldehyde-free adhesive layer 103 .

The thickness of the core board 101 is 6-8 mm, and the thickness of the single board 102 is 2-3 mm.

The thickness of the back plate 3 is 0.7-1 mm, and the thickness of the panel 5 is 1-2.5 mm.

The wood grain directions of the core board 101 , the face plate 5 and the back board 3 are all longitudinal (consistent with the length direction of the floor), and the wood grain directions of the two veneers 102 are all horizontal.

The first thermosetting adhesive film paper 2 and the second thermosetting adhesive film paper 4 are both thermosetting adhesive film papers, and the thickness of the first thermosetting adhesive film paper 2 and the second thermosetting adhesive film paper 4 is 0.6-0.7 mm.

The processing technology of described a kind of low-formaldehyde high-quality solid wood composite floor, comprises the following steps:

a. After coating the surface of both sides of the core board with MDI formaldehyde-free glue, glue and pre-press the two veneers to obtain the A substrate;

b. Assemble the backplane, the first heat-cured adhesive film, the A substrate, the second heat-cured adhesive film and the panel from bottom to top in sequence, and then heat and press them. The overall hot-pressing time is 1~ 2 minutes, get B plain plate;

c. Cool the plain board B naturally and stack it for 3 to 7 days to obtain the plain board C;

d. Carry out slotting and surface painting on the C plain board in turn to obtain the finished floor.

The gluing pre-pressing temperature in the step a is normal temperature, and the gluing pre-pressing time is 30-60 minutes.

In the step b, put the assembled plain plate into a hot press, heat and press the plain plate through the hot press, and complete the hot pressing when the temperature of the plain plate rises to 108-116°C.

The working principle of the present invention: the present invention replaces the existing urea-formaldehyde glue with heat-cured adhesive film paper to glue the base plate 1, the back plate 3 and the face plate 5, which can effectively reduce the process steps and costs required for the hot-press gluing of the composite floor. process time, thereby improving the heat-pressing efficiency of the floor; at the same time, since the heat-cured adhesive film paper is in a solid state before treatment and after heat-pressing, it can reduce the formaldehyde emission of the floor compared with urea-formaldehyde glue, and improve the environmental protection effect of the floor . By limiting the grain direction of each board, on the one hand, the grains of adjacent boards can be criss-crossed, so that the boards can restrain each other when deforming along the grain direction, thereby alleviating the overall deformation of the floor. On the other hand, since the texture direction of the core board 101, the back board 3 and the front board 5 are the same, the deformation coefficients of the inner board and the front board are similar, thereby avoiding the deformation caused by the difference in the deformation of the inner and outer layers when the floor is deformed by the external environment. The problem of cracking or crushing, further improving the structural stability of the present invention.

Example 2. A kind of low-formaldehyde high-quality solid wood composite floor, the composition is as shown in Figure 1, including a substrate 1, the back of the substrate 1 is connected with a backboard 3 through the first heat-curing adhesive film 2, and the front of the substrate 1 is connected with the second heat-curing glue. The membrane paper 4 is connected with a panel 5; the substrate 1 includes a core board 101, and both sides of the core board 101 are provided with a veneer 102; the melting point of the first thermosetting adhesive film paper 2 and the second thermosetting adhesive film paper 4 Both are 25-30°C, and the curing temperature is 108-116°C.

The front and back of the core board 101 are connected to the veneer 102 through the MDI formaldehyde-free adhesive layer 103 .

The thickness of the core board 101 is 6-8 mm, and the thickness of the single board 102 is 2-3 mm.

The thickness of the back plate 3 is 0.7-1 mm, and the thickness of the panel 5 is 1-2.5 mm.

The wood grain directions of the core board 1 , the face plate 5 and the back board 3 are all longitudinal (consistent with the length direction of the floor), and the wood grain directions of the two veneers 102 are all horizontal.

The first thermosetting adhesive film paper 2 and the second thermosetting adhesive film paper 4 are both thermosetting adhesive film papers, and the thickness of the first thermosetting adhesive film paper 2 and the second thermosetting adhesive film paper 4 is 0.6-0.7 mm.

The processing technology of described a kind of low-formaldehyde high-quality solid wood composite floor, comprises the following steps:

a. After coating the surface of both sides of the core board with MDI formaldehyde-free glue, glue and pre-press the two veneers to obtain the A substrate;

b. Assemble the backplane, the first heat-cured adhesive film, the A substrate, the second heat-cured adhesive film, and the panel from bottom to top in sequence, and then heat and press them for 1 to 2 minutes. Minutes, get B plain board;

c. Cool the plain board B naturally and stack it for 3 to 7 days to obtain the plain board C;

d. Carry out slotting and surface painting on the C plain board in turn to obtain the finished floor.

The concrete steps of described step a are:

a1. Insulate the core board at 70°C for 5-10 minutes to obtain the A1 core board;

a2. Heat the MDI formaldehyde-free glue to 50-60°C and apply it on both sides of the A1 core board to obtain the A2 core board;

a3. After adhering the two veneers to the upper and lower sides of the A2 core board respectively, perform gluing and pre-pressing at room temperature, and the pre-pressing time is 30 to 60 minutes to obtain the A substrate.

In the step b, put the plain plate after the blank assembly into the hot press, heat and press the plain plate from normal temperature through the hot press, and raise the temperature to 90-100°C within 1 minute, then heat-preserve and press After 30 seconds, the temperature is raised rapidly to 108-116°C, and the hot pressing is completed after 30 seconds of heat preservation and hot pressing.

This embodiment further optimizes the pre-pressing process for the bonding effect of MDI formaldehyde-free glue. By heating the core board at a pre-pressing temperature higher than that of MDI formaldehyde-free glue, the core board and MDI formaldehyde-free glue are cooled together. It can effectively avoid the rapid cooling of the MDI formaldehyde-free glue, thereby ensuring that the MDI formaldehyde-free glue completely penetrates into the wood pores, improves the gluing effect of the present invention on the core board and facilitates the manufacturer's control of the MDI formaldehyde-free glue in the pre-pressing process.

At the same time, in this embodiment, during the heating and hot pressing process of the plain board, the temperature is rapidly raised to 90-100°C and kept warm, so that the heat-cured adhesive film can completely melt into a liquid state and penetrate into the pores of the wood during the heating and heat preservation process; Then heat and press for 30 seconds, so that the liquid glue can be completely cured at this temperature, so as to ensure the gluing effect on the plain board.

Claims (1)

1. The utility model provides a low aldehyde high quality wood laminate flooring which characterized in that: the back surface of the substrate (1) is connected with a back plate (3) through a first thermosetting adhesive film paper (2), and the front surface of the substrate (1) is connected with a panel (5) through a second thermosetting adhesive film paper (4); the substrate (1) comprises a core board (101), and the front surface and the back surface of the core board (101) are respectively provided with a single board (102); the front surface and the back surface of the core plate (101) are connected with a veneer (102) through an MDI (diphenylmethane diisocyanate) formaldehyde-free adhesive layer (103);

the processing technology of the low-formaldehyde high-quality solid wood composite floor comprises the following steps:

a. coating MDI (diphenylmethane diisocyanate) aldehyde-free glue on the surfaces of two sides of the core plate, and gluing and prepressing the core plate and the two veneers to obtain a substrate A;

b. sequentially assembling the back plate, the first thermosetting adhesive film paper, the substrate A, the second thermosetting adhesive film paper and the panel from bottom to top, and then heating and hot-pressing the assembled components for 1-2 minutes to obtain a green board B;

c. naturally cooling the element B plate and stacking for 3-7 days to obtain an element C plate;

d. sequentially grooving and surface painting the plain board C to obtain a finished floor product;

the gluing prepressing temperature in the step a is normal temperature, and the gluing prepressing time is 30-60 minutes;

the specific steps of the step a are as follows:

a1. preserving the temperature of the core plate for 5-10 minutes at 70 ℃ to obtain an A1 core plate; keeping the MDI formaldehyde-free glue in a liquid state in the coating and initial prepressing processes, and further fully permeating the MDI formaldehyde-free glue into wood pores;

a2. heating MDI formaldehyde-free glue to 50-60 ℃, and coating the heated MDI formaldehyde-free glue on the surfaces of two sides of the A1 core plate to obtain an A2 core plate;

a3. adhering two veneers to the upper side and the lower side of the A2 core plate respectively, and then gluing and prepressing at normal temperature for 30-60 minutes to obtain a substrate A; the core plate is heated to a temperature higher than the MDI formaldehyde-free glue in a prepressing manner, so that the core plate and the MDI formaldehyde-free glue are effectively prevented from being rapidly cooled in the process of cooling together, and the MDI formaldehyde-free glue is ensured to be completely permeated into wood pores;

putting the assembled green board into a hot press, heating and hot-pressing the green board by the hot press, and finishing hot pressing when the temperature of the green board is increased to 108-116 ℃;

the thickness of the core board (101) is 6-8 mm, and the thickness of the veneer (102) is 2-3 mm;

the thickness of the back plate (3) is 0.7-1 mm, and the thickness of the face plate (5) is 1-2.5 mm;

the wood grain directions of the core board (101), the face board (5) and the back board (3) are longitudinal, and the wood grain directions of the two single boards (102) are transverse;

the first thermosetting adhesive film paper (2) and the second thermosetting adhesive film paper (4) are both thermosetting adhesive film paper, and the thickness of the first thermosetting adhesive film paper (2) and the thickness of the second thermosetting adhesive film paper (4) are 0.6-0.7 mm.

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