Halogen seepage-free adhesive and its preparation method and use
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A technology of adhesives and thickeners, applied in the production of halide-free straw flowerpots, the field of preparation of melamine-urea-formaldehyde copolymer glue
Inactive Publication Date: 2012-06-27
JIANGSU ACAD OF AGRI SCI
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[0017] The purpose of the present invention is to solve the problem of brine seepage and product brittleness in the process of using traditional low-aldehyde urea-formaldehyde resin adhesives. Provide a method for making a new type of non-halogenated adhesive, which has been applied in the production of straw flowerpots
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[0042] The thickener is 35g of polyvinyl alcohol; the free formaldehyde scavenger is a mixture of 80g of corn starch and 40g of soybean powder.
[0043] The alkaline solution is 25% ammonia water; the acidic solution is 20% formic acid solution.
[0044] The straw powder is corn straw powder, appropriate amount.
[0045] First, put 2207g of the measured 37% (W / W) formaldehyde solution into the reactor at one time, adjust the pH value to 8.5 with alkaline solution, add 32.6 g of thickener polyvinyl alcohol and 49.0 g of the first batch of melamine, Start to heat up; raise the temperature to 40°C, add the first batch of urea 742.4 g, continue to heat up to 60°C, keep warm at 60°C for 20 minutes; adjust the pH value to 7.5 with alkaline solution, add the second batch of urea 346.6 g, and within 30 minutes Raise the temperature to 90°C, keep it warm at 90°C for 40 minutes; adjust the pH value to 8.5 with ...
Embodiment 2
[0063] Urea 1138.4 Kg; melamine 221.8 kg; 37% (W / W) formaldehyde solution 2000 kg.
[0064] The thickener is 17.1 kg of polyvinyl alcohol; the free formaldehyde scavenger is a mixture of 68.3 kg of corn starch and 68.3 kg of soybean flour.
[0065] The alkaline solution is 20% sodium hydroxide solution; the acidic solution is 20% formic acid solution.
[0066] Straw powder is wheat straw powder, appropriate amount.
[0067] First, put 2000 kg of measured 37% (W / W) formaldehyde solution into the reactor at one time, adjust the pH value to 8.5 with alkaline solution, add 17.1 kg of thickener polyvinyl alcohol and the first batch of melamine 41.0 kg , start to heat up; raise the temperature to 40°C, add the first batch of urea 643.5 kg, continue to raise the temperature to 60°C, keep time at 60°C for 20 min; adjust the pH value to 7.5 with alkaline solution, add the second batch of urea 494.9 kg, and Raise the temperature to 90°C within 30 minutes, and keep at 90°C for 40 minut...
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Abstract
The invention relates to a halogen seepage-free adhesive and its preparation method and use. The halogen seepage-free adhesive is a melamine-urea-formaldehyde copolymer containing low-free urea and low-free formaldehyde. Urea, melamine and formaldehyde undergo a polymerization reaction in the presence of a thickening agent as an auxiliary material and one or more free formaldehyde catching agentsto produce the halogen seepage-free adhesive, wherein a mole ratio of the formaldehyde to the urea is (1.3 to 1.5): 1; a mole ratio of the formaldehyde to the melamine is (11 to 14): 1; the mass of the thickening agent is 1.0 to 3.0% of the total mass of the urea; the mass of the one or more free formaldehyde catching agents is 8.0 to 12.0% of the total mass of the urea; and the halogen seepage-free adhesive has a pH value of 7.5 to 8.0. The preparation method adopts a weak base-weak acid synthesis technology and comprises the following steps of adding urea into a reaction system by two steps, adding melamine into the reaction system by three steps, adding the thickening agent into the reaction system in an early stage of synthesis and adding the one or more free formaldehyde catching agents into the reaction system in a later stage of the synthesis. In use, the halogen seepage-free adhesive and straw powder are mixed and are processed into a halogen seepage-free straw flowerpot.
Description
[0001] Technical field: [0002] The present invention relates to an adhesive and its preparation method and application, especially the preparation method of melamine-urea-formaldehyde copolymer glue with low free formaldehyde and low free urea, and its application in making non-returning halogen straw flowerpots . [0003] technical background: [0004] my country is a large agricultural country, with an annual output of 600 million tons of straw, accounting for 20% to 30% of the world's total straw output. Except for returning fields, rural fuel, feed, papermaking, and collecting losses, the rest can be used for other purposes The total amount of straw is 376 million tons, and there is great potential for development and utilization. Around the comprehensive utilization of straw, a lot of research has been carried out at home and abroad. Among them, the use of straw to make agricultural biodegradable containers such as seedling containers and flower pots is a new way ...
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