Modified-starch-based wood adhesive and preparation method thereof
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A wood adhesive, starch-based technology, applied in the direction of adhesives, adhesive additives, adhesive types, etc., to achieve the effects of wide source, long storage period and simple equipment
Inactive Publication Date: 2012-09-19
HEFEI UNIV OF TECH
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Problems solved by technology
However, from the research results, it can be seen that starch-based adhesives are used in wood-based panels, and there are still problems such as water resistance, bonding strength, solid content and storage stability.
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Embodiment 1
[0022] 1. Formula (parts by mass):
[0023] 100 parts of oxidized corn starch, 100 parts of deionized water, 0.3 parts of sodium hydroxide, 3.0 parts of epichlorohydrin, 0.1 parts of sodium dodecylbenzenesulfonate, 0.18 parts of ammonium persulfate, 0.04 parts of sodium bisulfite, propylene 14 parts of amide, 7 parts of ethyl methacrylate, 10 parts of polyvinyl alcohol, 1 part of tributyl phosphate, 2 parts of urea, and 2 parts of glycerin.
[0024] 2. Process:
[0025] Add 80 parts of oxidized cornstarch to 100 parts of deionized water, and configure a starch emulsion with a mass concentration of 44% in a container with a stirring device. After stirring at a speed of 1000 rpm for 20 minutes, add sodium hydroxide to adjust the pH value to 9 -10, the temperature is 50 ° C, slowly drop the cross-linking agent epichlorohydrin to carry out the cross-linking reaction, the reaction time is 2 hours, and then add the remaining 20 parts of oxidized corn starch, the reaction conditions...
Embodiment 2
[0029] 1. Formula (parts by mass):
[0030] 100 parts of oxidized corn starch, 100 parts of deionized water, 0.4 parts of sodium hydroxide, 5.0 parts of epichlorohydrin, 0.3 parts of sodium dodecylbenzenesulfonate, 0.25 parts of ammonium persulfate, 0.06 parts of sodium bisulfite, propylene 19 parts of amide, 10 parts of ethyl methacrylate, 15 parts of polyvinyl alcohol, 1 part of tributyl phosphate, 2 parts of urea, and 2 parts of glycerin.
[0031] 2. Process:
[0032] The preparation method of this example is the same as that of Example 1, and the solid content of the prepared adhesive is 48%.
[0033] The adhesive of the invention is used for gluing birch, basswood and poplar plywood, and its dry gluing strength is excellent. Test according to the method specified in GB / T17657-1999, put the test piece in hot water at 63±3°C for 3 hours, then place the test piece flat in an air convection drying oven at 63±3°C for 1 hour, take it out Cool down at room temperature for 10 ...
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Abstract
The invention discloses a modified-starch-based wood adhesive and a preparation method thereof. The preparation method comprises the steps that oxidized corn starch is used as a main raw material, a cross-linking agent is added into the oxidized corn starch to conduct crosslinking modification, and then an initiating agent and a high molecular monomer are added to the oxidized corn starch to conduct graft modification, so as to obtain a modified starch emulsion in a complex net structure; and after the modified starch emulsion is warmed up and pasted, modifying agents comprising a stabilizing agent, a defoaming agent, a plasticizing agent and the like are added into the modified starch emulsion, and the high-performance green environment-friendly adhesive is manufactured. Each performance of the adhesive disclosed by the invention can reach or exceed requirements of a GB/T9846-2004 standard, the adhesive has the characteristics of high bonding strength, good water resistance, long storage time, high solid content, low cost, greenness, environment friendliness and wide use range, and can be widely applied to the bonding and the use of wood materials such as artificial boards, plywood and cellulose boards.
Description
1. Technical field [0001] The invention belongs to the field of adhesives, and mainly relates to a cross-linking-grafting composite modified starch-based wood adhesive with oxidized corn starch as the main raw material and a preparation method thereof. 2. Background technology [0002] Since the beginning of the 21st century, the domestic wood-based panel industry has achieved extraordinary rapid development, with an average annual growth rate of 22%. In 2009, the output of wood-based panels exceeded 80 million cubic meters, and the annual consumption of adhesives was about 5 million. It has become the world's largest wood-based panel production country. At present, the adhesives used in the wood-based panel manufacturing industry at home and abroad are mainly urea-formaldehyde resin, phenolic resin, melamine-formaldehyde resin, etc. This type of adhesive has a high content of free formaldehyde, and slowly releases toxic formaldehyde gas during use, causing harm to the human...
Claims
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