Method for preparing starch adhesive for timber through emulsion polymerization

A starch adhesive, emulsion polymerization technology, applied in the direction of graft polymer adhesives, adhesives, unsaturated alcohol copolymer adhesives, etc., can solve the problems of poor product stability, slow reaction speed, easy to stick into blocks, etc. , to achieve the effect of improving stability

Active Publication Date: 2012-07-18
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention is mainly to solve the problems existing in the existing production process of starch adhesive suspension polymerization for wood, such as easy to s

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Recipe (by mass):

[0028] cornstarch 100

[0029] water 300

[0030] Ammonium persulfate 0.8

[0031] Hydrochloric acid 3.5

[0032] Vinyl acetate 80

[0033] Cetyltrimethylammonium bromide 2

[0034] Polyvinyl alcohol 6

[0035] Urea 15

[0036] Glycerin 5

[0037] Tributyl phosphate 1.5

[0038] crafting process:

[0039] Mix corn starch and hydrochloric acid solution into 30% (w / w, based on starch dry basis) starch milk, acid hydrolyze at 60°C for 0.5h, adjust the pH to about 3.5, add part of ammonium persulfate (accounting for 80% of the total %) and cetyltrimethylammonium bromide, slowly drop vinyl acetate, add the remaining ammonium persulfate after reacting for 1.5h, continue to react for 1.5h, neutralize to neutral, add polyethylene to the solution Alcohol, heat up to 80°C, keep warm for 30 minutes, cool down to 50°C, add glycerin, tributyl phosphate and urea, stir for a period of time, continue to cool down, discharge at 30°C, pack, seal, and reserve...

Embodiment 2

[0041] Recipe (by mass):

[0042] Waxy Corn Starch 100

[0043] water 250

[0044] Ammonium persulfate 1.5

[0045] Hydrochloric acid 3.2

[0046] Vinyl acetate 70

[0047] Sodium Lauryl Sulfate 2.5

[0048] Polyvinyl alcohol 6

[0049] Urea 10

[0050] Glycerin 5

[0051] Tributyl phosphate 1.5

[0052] crafting process:

[0053] Mix waxy cornstarch and hydrochloric acid solution into 35% (w / w, based on starch dry basis) starch milk, acid hydrolyze at 70°C for 1 hour, adjust the pH to about 4.0, add part of ammonium persulfate (accounting for the total amount of 60%) and sodium lauryl sulfate, slowly drop vinyl acetate, add the remaining ammonium persulfate after reacting for 2 hours, continue to react for 1.5 hours, neutralize to neutrality, add polyvinyl alcohol in the solution, and heat up to After 80°C, keep warm for 30 minutes, cool down to 50°C, add glycerin, tributyl phosphate and urea, stir for a period of time, continue to cool down, discharge at 30°C, pack...

Embodiment 3

[0055] Recipe (by mass):

[0056] cornstarch 100

[0057] water 300

[0058] Ammonium persulfate 1.5

[0059] Hydrochloric acid 3

[0060] Vinyl acetate 90

[0061] Phosphate Emulsifier 2

[0062] Polyvinyl alcohol 6

[0063] Urea 15

[0064] Glycerin 5

[0065] Tributyl phosphate 1.5

[0066] crafting process:

[0067] Mix corn starch and hydrochloric acid solution into 30% (w / w, based on starch dry basis) starch milk, acid hydrolyze at 60°C for 2 hours, adjust the pH to about 5.0, add part of ammonium persulfate (accounting for 70% of the total ) and phosphate emulsifier, slowly drop vinyl acetate, add the remaining ammonium persulfate after reacting for 1.5h, continue reacting for 1h, neutralize to neutral, add polyvinyl alcohol into the solution, heat up to 80°C, Insulate and react for 30 minutes, cool down to 50°C, add glycerin, tributyl phosphate and urea, stir for a period of time, continue to cool down, discharge at 30°C, pack, seal, and set aside.

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PUM

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Abstract

The invention discloses a method for preparing a starch adhesive for timber through emulsion polymerization, and belongs to the technical field of manufacturing methods of adhesives. The method comprises the following steps of: performing acid hydrolysis pretreatment on starch which is used as a main raw material; adding an initiator and an emulsifier into a reaction system; dropwise adding monomer to perform emulsion graft copolymerization; heating to paste; and adding auxiliary agents to finally obtain an emulsion starch adhesive for timber with superior performance. Compared with the conventional starch adhesive for timber prepared by using suspension polymerization, a product prepared by the method has the advantages that: the appearance, the adhesion strength and the stability are all obviously improved; the comprehensive performance reaches and even exceeds the level of the conventional commercially available high-grade white latex; the product can be applied to timber adhesion well; and a timber product adhered by the starch adhesive releases no toxic or harmful gases.

Description

technical field [0001] The invention relates to a method for preparing a starch adhesive for wood through emulsion polymerization, and belongs to the technical field of adhesive manufacturing methods. technical background [0002] Starch is a very abundant organic compound in nature. It has the advantages of wide source, low price, complete degradability, renewable and non-polluting. Starch adhesives with excellent properties can be prepared by acid hydrolysis, oxidation, and graft copolymerization modification. However, the traditional suspension polymerization production process currently used often causes droplets to aggregate, and the resulting polymer is easily Bonding forms larger particles. At the same time, the polymerization product particles will contain a small amount of monomer, which is not easy to remove completely. These seriously affect the performance of starch adhesives. Emulsion polymerization is similar to suspension polymerization on the surface, but du...

Claims

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Application Information

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IPC IPC(8): C09J151/02C09J129/04C08F251/00C08F2/24C08B30/12
Inventor 顾正彪李兆丰程力洪雁王健
Owner JIANGNAN UNIV
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