阅读说明：本技术 用于提升无醛板镂铣性能的组合添加剂、制备方法及应用 (Combined additive for improving routing performance of formaldehyde-free plate, preparation method and application ) 是由 郭崇君 马路 石志锋 陈晓栋 黄庸 吴德伟 何红兵 于 2020-06-18 设计创作，主要内容包括：本发明提供一种用于提升无醛板镂铣性能的组合添加剂、制备方法及应用,所述组合添加剂用于填充至所述无醛板的纤维中,所述组合添加剂由A组分和B组分组成,A组分和B组分均用于单独施加；A组分为：白糊精粉的水溶液,其中固含量占所述组合添加剂总固体质量的70～90％；B组分为：木质素的水溶液,其中固含量占所述组合添加剂总固体质量的10～30％。本发明通过采用上述技术方案,生产出的无醛纤维板达到脲醛树脂纤维板的镂铣效果,在保证无醛的情况下,实现了优质的镂铣加工性能,因板材镂铣面不光滑而投诉的次数从每月2次降为0次,镂铣加工刀具损耗大的情况也起到了很好的改善作用,刀具从每班更换2次降低到每班1次。(The invention provides a combined additive for improving the routing performance of an aldehyde-free board, a preparation method and application, wherein the combined additive is used for being filled into fibers of the aldehyde-free board, and consists of a component A and a component B, and the component A and the component B are used for being applied independently; the component A is as follows: the water solution of the white dextrin powder, wherein the solid content accounts for 70-90% of the total solid mass of the combined additive; the component B is as follows: and (3) lignin aqueous solution, wherein the solid content accounts for 10-30% of the total solid mass of the combined additive. By adopting the technical scheme, the produced formaldehyde-free fiberboard achieves the routing effect of the urea-formaldehyde resin fiberboard, the high-quality routing processing performance is realized under the condition of ensuring the formaldehyde-free performance, the complaint frequency is reduced from 2 times per month to 0 time due to the unsmooth routing surface of the board, the condition of large loss of routing processing cutters also plays a good improving role, and the cutters are reduced from 2 times per shift to 1 time per shift.)

1. A combination additive for enhancing routing performance of an aldehyde-free board, the combination additive for filling into fibers of the aldehyde-free board, characterized in that: the combined additive consists of a component A and a component B, both of which are used for separate application; wherein:

the component A is as follows: the water solution of the white dextrin powder, wherein the solid content accounts for 70-90% of the total solid mass of the combined additive;

the component B is as follows: and (3) lignin aqueous solution, wherein the solid content accounts for 10-30% of the total solid mass of the combined additive.

2. The additive package of claim 1, wherein: the solid content of the aqueous solution of the white dextrin powder accounts for 85-90% of the total solid mass of the combined additive; the solid content of the lignin in the aqueous solution accounts for 10-15% of the total solid mass of the combined additive.

3. A method for preparing the additive package of claim 1 or 2, comprising the steps of:

preparing a component A: preparing the white dextrin powder into a water solution with the concentration of 43-45%, and keeping rapid stirring in the preparation process;

preparing a component B: preparing lignin into 38-40% aqueous solution, and stirring rapidly during preparation.

4. The production method according to claim 3,

in the process of preparing the component A, the temperature of the solution is kept between 25 and 60 ℃, and the stirring speed is controlled between 100 and 300 rpm;

in the process of preparing the component B, the temperature of the solution is kept at 25-30 ℃, and the stirring speed is controlled at 100-300 rpm.

5. A method of using the additive package of claim 1 or 2, comprising the steps of:

the combined additives are applied separately by means of a screw pump in a blow-off pipe as the fiber discharge line of the defibrator.

6. The application method of claim 5, wherein the mass ratio of the application amount of the combined additive to the fiber amount in the fiber board to be made is 5-10%, and the unit consumption is 40-80kg/m³。

7. The application method according to claim 6, further comprising: and (3) carrying out hot pressing process optimization treatment on the fibers after the combined additive is applied, wherein the hot pressing process optimization treatment comprises the steps of adjusting the heating temperature and the pressure of a press and adjusting and balancing the density distribution of the core surface layer of the plate.

8. The application method of claim 7, wherein in the hot pressing process optimization treatment, the heating temperature of the press is increased by 5-10 ℃, and the pressure of the press is increased by 0.1-0.3 MPa.

Technical Field

The invention relates to the technical field of furniture boards, in particular to a combined additive for improving the routing performance of a formaldehyde-free board, a preparation method and application.

Background

With the continuous improvement of the quality requirement of consumers on the household air environment, the development of the medium-density formaldehyde-free MDI fiberboard is rapid in recent years, and the productivity of the MDI fiberboard is continuously expanded. Although the MDI fiber board is not added with formaldehyde, the environmental protection performance is undoubted, the limitation on the processing performance is more and more prominent along with the gradual increase of the application range, particularly when the MDI fiber board is applied to routing processing, the routing performance is poorer than that of a urea resin board, the smoothness of the routing surface is insufficient, and the surface of a plastic film after plastic suction does not meet the requirement.

Disclosure of Invention

In order to overcome the defects of the prior art, the invention aims to provide a combined additive for improving the routing performance of an aldehyde-free plate, and a preparation method and an application method thereof.

In order to achieve the purpose, the invention adopts the following technical scheme:

a combination additive for enhancing routing performance of an aldehyde-free board, the combination additive for filling into fibers of the aldehyde-free board, the combination additive consisting of an a-component and a B-component, both a-component and B-component for separate application;

the component A is as follows: the water solution of the white dextrin powder, wherein the solid content accounts for 70-90% of the total solid mass of the combined additive;

the component B is as follows: and (3) lignin aqueous solution, wherein the solid content accounts for 10-30% of the total solid mass of the combined additive.

Preferably, the solid content of the aqueous solution of the white dextrin powder accounts for 85-90% of the total solid mass of the combined additive.

Preferably, the solid content of the lignin in the aqueous solution accounts for 10-15% of the total solid mass of the combined additive.

The preparation method of the combined additive comprises the following steps:

preparing a component A: in order to facilitate application through equipment, preparing aqueous solution from the white dextrin powder according to the concentration of 43-45%, keeping the temperature of the solution at 25-60 ℃, and keeping rapid stirring in the preparation process, wherein the stirring speed is controlled at 100-300 rpm;

preparing a component B: in order to facilitate application through equipment, the lignin is prepared into an aqueous solution according to the concentration of 38-40%, the temperature of the solution is kept at 25-30 ℃, rapid stirring is kept during the preparation process, and the stirring speed is controlled at 100-300 rpm.

An application method of a combined additive for improving the routing performance of a formaldehyde-free plate comprises the following steps:

respectively applying the component A and the component B in a spraying pipe serving as a fiber discharge pipeline of a hot mill through a screw pump, wherein the application amount is 5-10% of the fiber amount in the fiber board to be manufactured, and the unit consumption is 40-80kg/m³. The blow-off tube is the fiber discharge conduit of the defibrator and is used primarily for the uniform mixing of the binder and/or other additives with the fibers therein.

Preferably, the application method further comprises: and (3) carrying out hot pressing process optimization treatment on the fibers after the combined additive is applied, namely adjusting the heating temperature and pressure of a press and adjusting and balancing the density distribution of the core surface layer of the board.

Specifically, in the optimization treatment of the hot pressing process, the heating temperature of the press is increased by 5-10 ℃, and the pressure of the press is increased by 0.1-0.3 MPa; the density of the surface layer of the core of the plate is controlled to be the average density (the average density is 780-800 kg/m)³) 88% or more, the curve does not have a significant rebound phenomenon.

In order to reduce the cost, the wood raw material can be reasonably optimized, for example, the wood raw material is changed into 50 percent of mixed wood and 50 percent of eucalyptus wood from all mixed wood, and the fineness of the fiber is improved.

Compared with the prior art, the invention has the beneficial effects that:

by adopting the technical scheme, the produced formaldehyde-free fiberboard achieves the routing effect of the urea-formaldehyde resin fiberboard, the high-quality routing processing performance is realized under the condition of ensuring the formaldehyde-free performance, the complaint frequency is reduced from 2 times per month to 0 time due to the unsmooth routing surface of the board, the condition of large loss of routing processing cutters also plays a good improving role, and the cutters are reduced from 2 times per shift to 1 time per shift.

The key point of the invention is that the method for adjusting the density distribution inside the plate by adding the combined additive as the filler is adopted, the compactness inside the plate is increased, the hardness of the plate can be reduced, the problems of poor routing effect and quick cutter loss in the routing processing process of the current medium-density formaldehyde-free MDI fiber routing plate are solved, and the method has the advantages of no cost increase and easy implementation on a production line.

Detailed Description

The present embodiment provides a combination additive for enhancing the routing performance of aldehyde-free boards, the combination additive comprising a component a and a component B, wherein:

the component A is as follows: the solid content of the aqueous solution of the aleurone powder accounts for 70-90%, preferably 85-90% of the solid mass of the combined additive;

the component B is as follows: the aqueous solution of the lignin accounts for 10-30%, preferably 10-15% of the solid mass of the combined additive.

When the component A (the aqueous solution of the white dextrin powder) is prepared, in order to be applied by equipment, the white dextrin powder is prepared into an aqueous solution according to the concentration of 43-45%, the temperature of the solution is kept at 25-60 ℃, the solution is quickly stirred in the preparation process, and the stirring speed is controlled at 100-300 rpm;

when the component B (lignin aqueous solution) is prepared, in order to be applied by equipment, the lignin is prepared into the aqueous solution according to the concentration of 38-40%, the temperature of the solution is kept at 25-30 ℃, the solution is quickly stirred in the preparation process, and the stirring speed is controlled at 100-300 rpm.

In the production process, the component A and the component B are respectively applied in a blow-off pipeline through a screw pump and applied in a blow-off pipe through the screw pump, the application amount is 5-10% of the mass of the fiber amount, and the total unit consumption is 40-80kg/m³。

As a preferred embodiment, for applying the groupAnd (3) carrying out hot pressing process optimization treatment on the fiber after the additive is mixed, namely adjusting and balancing the density distribution of the core surface layer of the plate by adjusting the heating temperature and the pressure of a press. Specifically, in the optimization treatment of the hot pressing process, the heating temperature of the press is increased by 5-10 ℃, and the pressure of the press is increased by 0.1-0.3 MPa; the density of the surface layer of the core of the plate is controlled to be the average density (the average density is 780-800 kg/m)³) 88% or more, the curve does not have a significant rebound phenomenon.

The wood raw material is changed from all miscellaneous wood into 50 percent miscellaneous wood and 50 percent eucalyptus wood, and aims to improve the fineness of the fiber.

By adopting the technical scheme, the produced formaldehyde-free fiber board achieves the routing effect of the urea-formaldehyde resin fiber board, realizes high-quality routing processing performance under the condition of ensuring the formaldehyde-free condition, and plays a good role in improving the condition of large cutter loss during routing processing.

The problems that the routing effect is poor and the cutter loss is fast in the routing processing process of the current medium-density formaldehyde-free MDI fiber routing plate with the added MDI fibers are solved, and the method has the advantages that the cost is not increased and the method is easy to implement on a production line.

The above description is only exemplary of the present invention and should not be taken as limiting the invention, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.