阅读说明：本技术 一种胶合板阻燃剂及其在制备阻燃型胶合板中的应用 (Plywood flame retardant and application thereof in preparation of flame-retardant plywood ) 是由 刘春晓 张雪 刘平平 车雪梅 从文韬 于 2019-10-29 设计创作，主要内容包括：本发明公开了一种胶合板阻燃剂,按重量份数计,包括如下组分：改性水滑石类化合物0-10份,矿土类化合物20-35份和硼酸盐类化合物60-75份。本发明的有益效果是：本发明胶合板阻燃剂中包括改性水滑石类化合物、矿土类化合物、硼酸盐类化合物三种组分,主要通过B-Si两种元素合理复配,发挥协同阻燃作用,复配后的化合物呈中性,相比胶用型磷氮系阻燃体系可避免胶合板的微腐蚀现象；本发明胶合板阻燃剂可直接添加至胶粘剂中,且在胶液中分散性好,成本低,间接提高了生产效益,经本发明胶合板阻燃剂处理的胶合板阻燃效果符合国家B1级阻燃标准。(The invention discloses a plywood flame retardant which comprises the following components in parts by weight: 0-10 parts of modified hydrotalcite compound, 20-35 parts of mineral soil compound and 60-75 parts of borate compound. The invention has the beneficial effects that: the flame retardant for the plywood comprises three components, namely a modified hydrotalcite compound, a mineral soil compound and a borate compound, and is prepared by reasonably compounding two elements, namely B-Si, so that a synergistic flame retardant effect is exerted, the compounded compound is neutral, and the micro corrosion phenomenon of the plywood can be avoided compared with a glue type phosphorus-nitrogen flame retardant system; the flame retardant for the plywood can be directly added into the adhesive, the dispersion in the adhesive solution is good, the cost is low, the production benefit is indirectly improved, and the flame retardant effect of the plywood treated by the flame retardant for the plywood meets the national B1-level flame retardant standard.)

1. The plywood flame retardant is characterized by comprising the following components in parts by weight:

0-10 parts of modified hydrotalcite compound, 20-35 parts of mineral soil compound and 60-75 parts of borate compound.

2. The plywood flame retardant of claim 1, wherein the modified hydrotalcite-like compound is one or more of a modified magnesium aluminum hydrotalcite, a nano-modified magnesium aluminum hydrotalcite, or a modified zinc aluminum hydrotalcite.

3. The plywood fire retardant of claim 1, wherein the mineral soil compound is one or more of attapulgite, sodium bentonite, montmorillonite, kaolin, calcined kaolin or high alumina bauxite.

4. The plywood flame retardant of claim 1, wherein the borate-type compound is one or more of anhydrous borax, ammonium pentaborate, zinc borate, or borax decahydrate.

5. The preparation method of the plywood is characterized by comprising the following preparation steps: adding the plywood flame retardant of any one of claims 1 to 4 and common flour to a urea-formaldehyde resin adhesive to prepare a flame-retardant adhesive, double-coating a core board with a double-coated glue machine, coating no glue on a veneer, using the veneer as the outer surfaces of two sides of the plywood, sequentially splicing a plurality of veneers and the core board in the middle, wherein the same boards are not contacted, and the direction of the spliced boards is vertical, and then performing cold press and hot press to prepare the plywood.

6. The method for preparing plywood according to claim 5, wherein a flame retardant accounts for 28-31 wt% of the urea-formaldehyde resin adhesive; the flour accounts for 25-30 wt% of the urea-formaldehyde resin adhesive.

7. The method for preparing plywood as claimed in claim 5, wherein the total amount of the flame retardant adhesive on both sides of the core board is 510-550g/m²。

8. The method of claim 5, wherein the plywood is characterized in that the sum of the number of plies of the core board and the number of plies of the veneers of the plywood is 3, 5 or 7.

Technical Field

The invention relates to the field of flame retardants, in particular to a plywood flame retardant and application thereof in preparation of flame-retardant plywood.

Background

The traditional soaking process for producing the flame-retardant plywood has the defects of complex process, time consumption, high cost and low production efficiency, and is limited by weather and places. The novel glue type direct adding process is characterized in that a flame retardant is directly added into an adhesive to prepare flame-retardant glue, the process is simple, the efficiency is high, phosphorus-nitrogen flame retardants are usually used, but the addition of part of flame retardants can damage the stability and the pH value of urea-formaldehyde glue, so that the quality of plywood is influenced, the flame-retardant effect is poor, and the cost is high.

Disclosure of Invention

The invention provides a plywood flame retardant and application thereof in preparing flame-retardant plywood, aiming at the problem of poor flame-retardant effect of the flame-retardant plywood prepared from the existing phosphorus-nitrogen flame retardant.

The technical scheme for solving the technical problems is as follows: the plywood flame retardant is characterized by comprising the following components in parts by weight: 0-10 parts of modified hydrotalcite compound, 20-35 parts of mineral soil compound and 60-75 parts of borate compound.

The modified hydrotalcite compound is one or more of modified magnesium aluminum hydrotalcite, nano modified magnesium aluminum hydrotalcite or modified zinc aluminum hydrotalcite.

The mineral soil compound is one or more of attapulgite, sodium-based white bentonite, montmorillonite, kaolin, calcined kaolin or high-alumina bauxite.

The borate compound is one or more of anhydrous borax, ammonium pentaborate, zinc borate or borax decahydrate.

The invention also relates to an application of the flame retardant in preparing flame-retardant plywood, which specifically comprises the following steps: adding fire retardant and common flour into urea-formaldehyde resin adhesive to obtain fire retardant adhesive, coating adhesive on the core plate with two surfaces by a double-surface coating machine, not coating adhesive on the single plate, and using the single plate as the core plateAnd sequentially splicing a plurality of veneers and core plates on the outer surfaces of two sides of the plywood in the middle, wherein the same plates are not contacted, and the direction of splicing is a vertical direction, and then manufacturing the plywood by a cold press and a hot press. Wherein, the flame retardant accounts for 28 to 31 weight percent of the urea-formaldehyde resin adhesive; the flour accounts for 25-30 wt% of the urea-formaldehyde resin adhesive; the total dosage of the flame retardant adhesive on the two sides of the core plate is 510-550g/m²(ii) a The sum of the number of the core boards and the number of the veneers in the plywood is 3, 5 or 7.

The invention has the beneficial effects that: the flame retardant for the plywood comprises three components, namely a modified hydrotalcite compound, a mineral soil compound and a borate compound, and is prepared by reasonably compounding two elements, namely B-Si, so that a synergistic flame retardant effect is exerted, the compounded compound is neutral, and the micro corrosion phenomenon of the plywood can be avoided compared with a glue type phosphorus-nitrogen flame retardant system; the flame retardant for the plywood can be directly added into the adhesive, the dispersion in the adhesive solution is good, the cost is low, the production benefit is indirectly improved, and the flame retardant effect of the plywood treated by the flame retardant for the plywood meets the national B1-level flame retardant standard.

Detailed Description

The present invention is described below with reference to examples, which are provided for illustration only and are not intended to limit the scope of the present invention.