A woodworking adhesive with long open time based on maltose syrup modified polyvinyl acetate emulsion

Abstract

The invention belongs to the technical field of adhesives, and relates to a long-open-time woodworking adhesive based on maltose syrup modified polyvinyl acetate emulsion. When the adhesive is prepared, firstly, polyvinyl alcohol and maltose syrup serve as a protective colloid, vinyl acetate serves as a monomer, ammonium persulfate serves as an initiator, the polyvinyl acetate emulsion is preparedby a seed emulsion polymerization process, and secondly, edible seaweed powder is added into copolymer emulsion. According to the polyvinyl acetate woodworking adhesive, water serves as a dispersionmedium, use is convenient, environments cannot be polluted, and the woodworking adhesive has the advantage of long open time as compared with a traditional polyvinyl acetate woodworking adhesive withthe same solid content.

Description

technical field

[0001] The invention relates to a special-performance woodworking adhesive preparation technology, in particular to the preparation of a polyvinyl acetate woodworking adhesive with long open time. Background technique

[0002] my country is a big country in the production and consumption of wood products, which has led to the vigorous development of wood adhesives. Water-based polyvinyl acetate (PVAc) adhesive is currently one of the most widely used and used environmentally friendly adhesives. It is obtained by emulsion polymerization with water as the dispersion medium, and is a water-based environmentally friendly adhesive. It is widely used in wood, furniture, decoration, printing, textiles, etc. , leather, paper and other industries, is a very environmentally friendly adhesive.

[0003] With the development of the national economy and the development of application fields, its usage will increase significantly. However, there are many disadvantages i...

Examples

Embodiment 1

[0020] Embodiment one total amount=1000kg

[0021] (1) 1 kilogram of ammonium persulfate is dissolved in 50 kilograms of water, obtains the ammonium persulfate initiator solution of 51 kilograms of polyreactions;

[0022] (2) 250 kilograms of vinyl acetate and 20 kilograms of methacrylic acid are mixed and stirred evenly to make 270 kilograms of mixed monomers;

[0023] (3) Add 525 kilograms of water, 1 kilogram of defoamer F681, 1 kilogram of buffering agent sodium bicarbonate, 2 kilograms of emulsifier AEO-9 in the reaction kettle, add 30 kilograms of Chuanwei polyvinyl alcohol 1788,10 under the condition of dispersing and stirring Kg of maltose syrup, stir and disperse for 10 minutes, heat up to 90°C, keep warm for 60 minutes, then cool down to 60°C, add 100 kg of vinyl acetate and 15 kg of ammonium persulfate initiator solution prepared in step (1), stir and disperse for 10 minutes ;

[0024] (4) Heat up to 78°C, keep warm for 20 minutes until there is no reflux, and the...

Embodiment 2

[0025] Embodiment two total amount=1000kg

[0026] (1) 1 kilogram of ammonium persulfate is dissolved in 50 kilograms of water, obtains the ammonium persulfate initiator solution of 51 kilograms of polyreactions;

[0027] (2) 280 kilograms of vinyl acetate and 20 kilograms of methacrylic acid are mixed and stirred evenly to make 2300 kilograms of mixed monomers;

[0028] (3) Add 495 kilograms of water, 1 kilogram of defoamer F681, 1 kilogram of buffer sodium bicarbonate, 2 kilograms of emulsifier AEO-9 in the reaction kettle, add 25 kilograms of Chuanwei polyvinyl alcohol 1788 under the condition of dispersion and stirring, 15 Kg of maltose syrup, stir and disperse for 10 minutes, heat up to 90°C, keep warm for 60 minutes, then cool down to 60°C, add 100 kg of vinyl acetate and 15 kg of ammonium persulfate initiator solution prepared in step (1), stir and disperse for 10 minutes ;

[0029] (4) Heat up to 78°C, keep warm for 20 minutes until there is no reflux, and then add 2...

Embodiment 3

[0030] Embodiment three total amount=1000kg

[0031] (1) 1 kilogram of ammonium persulfate is dissolved in 50 kilograms of water, obtains the ammonium persulfate initiator solution of 51 kilograms of polyreactions;

[0032] (2) 280 kilograms of vinyl acetate and 20 kilograms of methacrylic acid are mixed and stirred evenly to make 2300 kilograms of mixed monomers;

[0033] (3) Add 495 kg of water, 1 kg of defoamer F681, 1 kg of buffer sodium bicarbonate, 2 kg of emulsifier AEO-9 in the reactor, add 20 kg of Chuanwei polyvinyl alcohol 1788, 20 Kg of maltose syrup, stir and disperse for 10 minutes, heat up to 90°C, keep warm for 60 minutes, then cool down to 60°C, add 100 kg of vinyl acetate and 15 kg of ammonium persulfate initiator solution prepared in step (1), stir and disperse for 10 minutes ;

[0034] (4) Heat up to 78°C, keep warm for 20 minutes until there is no reflux, and then add 270 kg of mixed monomers in the step (2) with the constant flow pump, and control the d...

technical field

[0001] The invention relates to a special-performance woodworking adhesive preparation technology, in particular to the preparation of a polyvinyl acetate woodworking adhesive with long open time. Background technique

[0002] my country is a big country in the production and consumption of wood products, which has led to the vigorous development of wood adhesives. Water-based polyvinyl acetate (PVAc) adhesive is currently one of the most widely used and used environmentally friendly adhesives. It is obtained by emulsion polymerization with water as the dispersion medium, and is a water-based environmentally friendly adhesive. It is widely used in wood, furniture, decoration, printing, textiles, etc. , leather, paper and other industries, is a very environmentally friendly adhesive.

[0003] With the development of the national economy and the development of application fields, its usage will increase significantly. However, there are many disadvantages i...

Examples

Embodiment 1

[0020] Embodiment one total amount=1000kg

[0021] (1) 1 kilogram of ammonium persulfate is dissolved in 50 kilograms of water, obtains the ammonium persulfate initiator solution of 51 kilograms of polyreactions;

[0022] (2) 250 kilograms of vinyl acetate and 20 kilograms of methacrylic acid are mixed and stirred evenly to make 270 kilograms of mixed monomers;

[0023] (3) Add 525 kilograms of water, 1 kilogram of defoamer F681, 1 kilogram of buffering agent sodium bicarbonate, 2 kilograms of emulsifier AEO-9 in the reaction kettle, add 30 kilograms of Chuanwei polyvinyl alcohol 1788,10 under the condition of dispersing and stirring Kg of maltose syrup, stir and disperse for 10 minutes, heat up to 90°C, keep warm for 60 minutes, then cool down to 60°C, add 100 kg of vinyl acetate and 15 kg of ammonium persulfate initiator solution prepared in step (1), stir and disperse for 10 minutes ;

[0024] (4) Heat up to 78°C, keep warm for 20 minutes until there is no reflux, and the...

Embodiment 2

[0025] Embodiment two total amount=1000kg

[0026] (1) 1 kilogram of ammonium persulfate is dissolved in 50 kilograms of water, obtains the ammonium persulfate initiator solution of 51 kilograms of polyreactions;

[0027] (2) 280 kilograms of vinyl acetate and 20 kilograms of methacrylic acid are mixed and stirred evenly to make 2300 kilograms of mixed monomers;

[0028] (3) Add 495 kilograms of water, 1 kilogram of defoamer F681, 1 kilogram of buffer sodium bicarbonate, 2 kilograms of emulsifier AEO-9 in the reaction kettle, add 25 kilograms of Chuanwei polyvinyl alcohol 1788 under the condition of dispersion and stirring, 15 Kg of maltose syrup, stir and disperse for 10 minutes, heat up to 90°C, keep warm for 60 minutes, then cool down to 60°C, add 100 kg of vinyl acetate and 15 kg of ammonium persulfate initiator solution prepared in step (1), stir and disperse for 10 minutes ;

[0029] (4) Heat up to 78°C, keep warm for 20 minutes until there is no reflux, and then add 2...

Embodiment 3

[0030] Embodiment three total amount=1000kg

[0031] (1) 1 kilogram of ammonium persulfate is dissolved in 50 kilograms of water, obtains the ammonium persulfate initiator solution of 51 kilograms of polyreactions;

[0032] (2) 280 kilograms of vinyl acetate and 20 kilograms of methacrylic acid are mixed and stirred evenly to make 2300 kilograms of mixed monomers;

[0033] (3) Add 495 kg of water, 1 kg of defoamer F681, 1 kg of buffer sodium bicarbonate, 2 kg of emulsifier AEO-9 in the reactor, add 20 kg of Chuanwei polyvinyl alcohol 1788, 20 Kg of maltose syrup, stir and disperse for 10 minutes, heat up to 90°C, keep warm for 60 minutes, then cool down to 60°C, add 100 kg of vinyl acetate and 15 kg of ammonium persulfate initiator solution prepared in step (1), stir and disperse for 10 minutes ;

[0034] (4) Heat up to 78°C, keep warm for 20 minutes until there is no reflux, and then add 270 kg of mixed monomers in the step (2) with the constant flow pump, and control the d...

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