Production process of termite-proof fiberboard

Abstract

The invention belongs to the technical field of artificial boards, and relates to a production process of an anti-termite fiberboard, which comprises the working procedures of wood peeling, chipping, screening, washing, pre-cooking, cooking, hot grinding, sizing, fiber drying, paving, pre-pressing, hot pressing, cooling, sanding, curing and the like, the mass percentage of melamine in the resin is 25-30%, before use, the adhesive is pumped into an intermediate storage tank, then the anti-termite agent is added, and stirring is performed for 20-40 min for use; the glue applying amount is 180-230 kg / m < 3 >, the termite-proof agent applying amount is 5-20 kg / m < 3 >, and the stirring speed is 100-500 r / min in the glue applying process until the adhesive is used up. By using the termite-resistant agent, the high-waterproof urea-formaldehyde resin and a special sizing process, the produced fiberboard is tested according to GB / T 18260-2015 Laboratory Test Method for Poison Effect of Wood Preservative to Termite, the termite-resistant grade reaches grade 9, and a fiberboard product prepared from the fiberboard can effectively prevent invasion of termites.

Description

Technical Field

[0001] The invention belongs to the technical field of artificial boards, relates to the production of fiberboards, and particularly relates to a production process of an anti-termite fiberboard. Background Art

[0002] Termites are one of the oldest social insects on earth, having survived for at least 130 million years. They are primitive in form, with different grades in the colony, clear division of labor, orderly organization, and amazing reproductive capacity. They are listed as one of the world's five major pests by the International Center for Insect Physiology and Ecology. There are nearly 3,000 known termites in the world, and more than 400 species of termites in my country. Termites are distributed in all provinces (municipalities and autonomous regions) except Xinjiang, Qinghai, Ningxia, Inner Mongolia, and Heilongjiang. Termites are hidden, extensive, and serious. The objects of their damage include houses, furniture, clothing, water conservancy projects, gardens, fruit trees, books and archives, storage materials, wires and cables, etc. Houses are the main objects of termite damage. Houses and buildings such as wooden structures, brick and wood structures, reinforced concrete structures, and steel structures will suffer from termite damage. Not only does it cause property losses to people and affect the normal production and life of residents, but it also affects the integrity and stability of houses and buildings, posing a threat to public safety. Fiberboard is made of wood and non-wood fibers, separated by fibers, and then applied with adhesives and additives, and then formed and hot-pressed. It is widely used for indoor and outdoor decoration. Ordinary fiberboard can serve as a food source for termites, which will promote their reproduction and thus destroy the integrity of fiberboard products and houses.

[0003] Based on the above situation, the present invention discloses a production process of a termite-proof fiberboard. According to GB / T18260-2015 "Laboratory Test Method for Toxic Effects of Wood Preservatives on Termites", the termite-proof grade reaches grade 9. Floors, furniture, etc. prepared with the termite-proof fiberboard can effectively prevent the invasion of termites and establish a strong barrier between termites and fiberboard products. Summary of the invention

[0004] The purpose of the present invention is to disclose a production process of an anti-termite fiberboard. Urea-formaldehyde resin is used as an adhesive and a specific production process is adopted. The fiberboard produced is tested according to GB / T 18260-2015 "Laboratory test method for the toxic effect of wood preservatives on termites", and the anti-termite grade reaches grade 9. The fiberboard products made of the fiberboard can effectively prevent the invasion of termites.

[0005] Technical Solution

[0006] A production process of termite-proof fiberboard, including: wood peeling → chipping → screening → water washing → pre-cooking → cooking → hot grinding → gluing → fiber drying → laying → pre-pressing → hot pressing → cooling → sanding → curing and other processes, wherein:

[0007] In the gluing process, the adhesive is a waterproof urea-formaldehyde resin, the mass percentage of melamine in the resin is 25-30%, the adhesive is first injected into the intermediate storage tank before use, and then the anti-termite agent is added and stirred for 20-40 minutes before use; the gluing process is continuously stirred at a stirring rate of 100-500r / min until the adhesive is used up, wherein the amount of glue applied is 180-230kg / m 3 , the application amount of anti-termite agent is 5~20kg / m 3 ;

[0008] The other steps are the conventional steps for making fiberboard with urea-formaldehyde resin.

[0009] In a preferred disclosed example of the present invention, the anti-termite agent is a bifenthrin microemulsion.

[0010] Furthermore, the bifenthrin microemulsion comprises, by mass percentage: 8-12% bifenthrin, preferably 10%; 5-20% acetone, preferably 12%; 5-10% isopropanol, preferably 7%; 5-15% Nongru 500#, preferably 10%; 20-40% emulsifier EL-40, preferably 30%, and the balance water.

[0011] In a preferred disclosed example of the present invention, the preparation process of the bifenthrin microemulsion is as follows:

[0012] (1) according to the material ratio, bifenthrin is put into a reactor;

[0013] (2) adding acetone and isopropanol into a reaction kettle and stirring at a stirring speed of 200 to 800 r / min;

[0014] (3) After the bifenthrin is dissolved, add Nongru 500# and emulsifier EL-40 into the reactor and stir at a stirring speed of 200-800 r / min until a transparent microemulsion is formed.

[0015] The anti-termite fiberboard produced according to the process of the present invention has an anti-termite grade of 9.

[0016] The present invention adds an anti-termite agent during the production process of the fiberboard, wherein the anti-termite agent is a cypermethrin microemulsion, and the microemulsion system can fully wrap the cypermethrin in the emulsifier and the solvent, thereby greatly reducing the damage to the cypermethrin in the fiber drying process; in the sizing process, the cypermethrin microemulsion is added to the adhesive in proportion, and the cypermethrin microemulsion is uniformly applied to the fiber along with the adhesive. This application method fully disperses the microemulsion in the adhesive, which improves the application uniformity on the one hand, and wraps the microemulsion in the adhesive on the other hand, and wraps the cypermethrin again. After the cypermethrin is wrapped twice, the damage to the cypermethrin in the fiber drying process is avoided, and the retention rate of the cypermethrin is greatly improved. The adhesive uses waterproof urea-formaldehyde resin with a melamine content of 25-30%. On the one hand, it improves the waterproofness of the fiberboard and can be used in humid environments, expanding the use of the fiberboard. On the other hand, the urea-formaldehyde resin with a high melamine content is harder after curing, and the fiberboard produced with it is also harder. The amount of fiberboard eaten by termites from the beginning of chewing to death will decrease, thereby improving the integrity of the fiberboard and improving the fiberboard's anti-termite grade.

[0017] Beneficial Effects

[0018] The fiberboard produced by the present invention uses an anti-termite agent, a highly waterproof urea-formaldehyde resin and a special sizing process, and is tested according to GB / T 18260-2015 "Laboratory Test Method for Toxic Effects of Wood Preservatives on Termites", and the anti-termite grade reaches Grade 9. The fiberboard products made from the fiberboard can effectively prevent the invasion of termites. DETAILED DESCRIPTION

[0019] The present invention is described in detail below in conjunction with the embodiments so that those skilled in the art can better understand the present invention, but the present invention is not limited to the following embodiments.

[0020] Example 1

[0021] A production process of a 10mm anti-termite fiberboard, comprising the steps of wood peeling → chipping → screening → water washing → pre-cooking → cooking → hot grinding → gluing → fiber drying → laying → pre-pressing → hot pressing → cooling → sanding → curing, etc., to obtain a finished board.

[0022] In the gluing process, the adhesive is a waterproof urea-formaldehyde resin, and the application amount is 200kg / m 3 The proportion of melamine in the resin is 25%. The adhesive is first injected into the intermediate storage tank before use. The anti-termite agent is added to the intermediate storage tank according to the proportion and stirred for 30 minutes before use. During the gluing process, the intermediate tank continues to stir. The stirring speed of the intermediate tank is maintained at 400r / min until the adhesive is used up.

[0023] The anti-termite agent is bifenthrin microemulsion, and the application amount is 15kg / m 3The raw materials and mass proportions of the preparation are: 10% of cypermethrin, 20% of acetone, 5% of isopropyl alcohol, 8% of agricultural milk 500#, 32% of emulsifier EL-40, and 25% of water.

[0024] The preparation process of the bifenthrin microemulsion is as follows:

[0025] (1) putting bifenthrin into a reactor;

[0026] (2) Add acetone and isopropanol into a reaction kettle and stir at a stirring speed of 500 r / min;

[0027] (3) After the bifenthrin is dissolved, add Nongru 500# and emulsifier EL-40 into the reactor and stir at a stirring speed of 500 r / min until a transparent microemulsion is formed.

[0028] The finished board has a termite resistance grade of 9.

[0029] Example 2

[0030] A production process of a 12mm anti-termite fiberboard, comprising the steps of wood peeling → chipping → screening → water washing → pre-cooking → cooking → hot grinding → gluing → fiber drying → laying → pre-pressing → hot pressing → cooling → sanding → curing, etc., to obtain a finished board.

[0031] In the gluing process, the adhesive is waterproof urea-formaldehyde resin, and the application amount is 220kg / m 3 The proportion of melamine in the resin is 28%. The adhesive is first injected into the intermediate storage tank before use. The anti-termite agent is added to the intermediate storage tank according to the proportion and stirred for 30 minutes before use. During the gluing process, the intermediate tank continues to stir. The stirring speed of the intermediate tank is maintained at 500r / min until the adhesive is used up.

[0032] The anti-termite agent is bifenthrin microemulsion, and the application amount is 20kg / m 3 The preparation raw materials and their mass proportions are: 10% of cypermethrin, 20% of acetone, 5% of isopropyl alcohol, 10% of agricultural milk 500#, 35% of emulsifier EL-40, and 20% of water.

[0033] The preparation process of the bifenthrin microemulsion is as follows:

[0034] (1) putting bifenthrin into a reactor;

[0035] (2) Add acetone and isopropanol into a reaction kettle and stir at a stirring speed of 600 r / min;

[0036] (3) After the bifenthrin is dissolved, Nongru 500# and emulsifier EL-40 are added into the reactor and stirred at a stirring speed of 600 r / min until a transparent microemulsion is formed.

[0037] The finished board has a termite resistance grade of 9.

[0038] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the specification of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A production process of termite-proof fiberboard, comprising wood peeling → chipping → screening → washing → pre-cooking → cooking → hot grinding → gluing → fiber drying → laying → pre-pressing → hot pressing → cooling → sanding → curing process, characterized in that: In the gluing process, the adhesive is a waterproof urea-formaldehyde resin, the mass percentage of melamine in the resin is 25-30%, and before use, the adhesive is first injected into the intermediate storage tank, and then the anti-termite agent is added, and stirred for 20-40 minutes before use; the gluing process is continuously stirred at a stirring rate of 100-500r / min until the adhesive is used up, wherein the glue application amount is 180-230kg / m 3 , the application amount of anti-termite agent is 5~20kg / m 3 ; The other steps are the conventional steps for making fiberboard with urea-formaldehyde resin.

2. The production process of the anti-termite fiberboard according to claim 1, characterized in that: The anti-termite agent is bifenthrin microemulsion.

3. The production process of the anti-termite fiberboard according to claim 2, characterized in that: The bifenthrin microemulsion comprises, by mass percentage, 8-12% of bifenthrin, 5-20% of acetone, 5-10% of isopropyl alcohol, 5-15% of Nongru 500#, 20-40% of emulsifier EL-40, and the balance of water.

4. The production process of the anti-termite fiberboard according to claim 3, characterized in that: The bifenthrin content is 10%.

5. The production process of the anti-termite fiberboard according to claim 3, characterized in that: The acetone content is 12%.

6. The production process of the anti-termite fiberboard according to claim 3, characterized in that: The isopropanol content is 7%.

7. The production process of the anti-termite fiberboard according to claim 3, characterized in that: The content of agricultural milk 500# is 10%.

8. The production process of the anti-termite fiberboard according to claim 3, characterized in that: The content of the emulsifier EL-40 is 30%.

9. The anti-termite fiberboard produced by the process according to any one of claims 1 to 8, characterized in that: The produced fiberboard has a termite resistance grade of 9.