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High performance environment friendly urea-formaldehyde resin adhesive and its preparing method and use

A urea-formaldehyde resin and adhesive technology, used in adhesives, aldehyde/ketone condensation polymer adhesives, chemical instruments and methods, etc., can solve the problems of increased product quality risk, poor production stability, and reduced production efficiency. The effect of large social environmental benefits and economic benefits, high bonding strength and easy operation

Inactive Publication Date: 2009-06-24
时君友
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is a domestic technology capable of producing E1 grade environment-friendly urea-formaldehyde resin adhesives. However, the production stability is poor; The pressure is poor (the room temperature can reach 2-4 hours), and the bonding strength is in the critical state required by the GB9846-2004 standard, which directly leads to the reduction of production efficiency and the increase of product quality risk, which limits the use of existing E1 grade urea-formaldehyde resin adhesives in wood bonding. Wide application in products

Method used

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  • High performance environment friendly urea-formaldehyde resin adhesive and its preparing method and use
  • High performance environment friendly urea-formaldehyde resin adhesive and its preparing method and use

Examples

Experimental program
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Effect test

Embodiment 1-3

[0050] Embodiment 1-3: the preparation of urea-formaldehyde resin in the present invention

[0051] Raw materials used in each embodiment and consumption are as table 1

[0052] Table 1

[0053]

[0054] Preparation method: (taking Example 1 as an example, other examples are the same as Example 1 except the raw material consumption)

[0055] (1) Add 3083kg of formaldehyde to the reaction kettle at one time, add sodium hydroxide to adjust the pH value to 8.1 after heating up, when the reaction temperature is 40°C, add 1275kg of urea for the first time (the molar ratio of formaldehyde F to urea U is 1.8, see Table 1①).

[0056] (2) Within 30 minutes, the reaction temperature rises from 40°C to 80°C, and when the reaction temperature is about 50-56°C, the steam is turned off to stop heating, and the reaction temperature rises naturally. Insulation reaction at 80-88°C for 30 minutes, when the measured pH value dropped to 6.7, add 12kg boric acid and adjust the pH value to 5....

Embodiment 4-6

[0060] Embodiment 4-6: the preparation of curing agent in the present invention

[0061] The raw materials and consumption used in each embodiment are shown in Table 2.

[0062] Table 2

[0063] Example 4 5 6 ammonium chloride 150kg 180kg 200kg Ferric chloride 80kg 120kg 150kg water 500kg 650kg 800kg

[0064] Preparation method: (taking Example 4 as an example, other examples are the same as Example 4 except the raw material consumption)

[0065] Grind 150kg of ammonium chloride and 80kg of ferric chloride to a fine powder of 500 mesh or more, then slowly and evenly disperse them into 500kg of water at 40-60°C to obtain a curing agent.

Embodiment 7-12

[0066] Embodiment 7-12: the application of adhesive of the present invention

[0067] The raw materials and consumptions used in each embodiment are shown in Table 3.

[0068] table 3

[0069] Example 7 8 9 10 11 12 Urea-formaldehyde resin 100kg 100kg 100kg 100kg 100kg 100kg Composite filler 10kg 15kg 20kg 0 0 0 Paper waste liquid 0 0 0 2kg 3kg 4kg Hardener 8kg 7kg 5kg 3kg 4kg 5kg

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Abstract

The adhesive of the present invention is characterized in that it uses a relatively low molar ratio of urea and formaldehyde of 0.8-1.03, and synthesizes urea-formaldehyde resin through alkali, acid and alkali processes, with a solid content of 48-55%, a viscosity of 80-120MPa.s, and a pH value of 7.2-7.8. Free formaldehyde ≤ 0.1%; use inorganic salt, inorganic acid and organic acid composite curing agent. It has the advantages of unique conception, standardized process, simple operation, easy equipment, no environmental pollution, easy implementation, and low price. It can be used in multi-layer plywood, three-layer solid wood (bamboo, bamboo wood) composite floor, multi-layer solid wood composite floor, blockboard, curved wood furniture, particle board and other products. It has excellent pre-compression, and it can be used for 30-40 minutes at room temperature Forming and bonding strength ≥ 0.7MPa, formaldehyde emission < 1.5mg / L, lower than the E1 requirements of GB18580-2001, and better physical and chemical properties than the II requirements of GB / T9846-1993.

Description

technical field [0001] The invention relates to a urea-formaldehyde resin adhesive and an improvement of a preparation method thereof, in particular to a high-performance environment-friendly urea-formaldehyde resin adhesive and a preparation method and use thereof, belonging to the technical field of adhesives in chemistry. Background technique [0002] Urea-formaldehyde resin adhesive is the most widely used adhesive in the wood industry, accounting for more than 80% of the industry's adhesive usage. my country introduced mandatory GB18580-2001 national standard on July 1, 2002, strictly restricting the release of indoor harmful substances, forcing the production pattern of urea-formaldehyde resin to change, and the number of environmentally friendly urea-formaldehyde resin adhesives is increasing rapidly. At present, there is a domestic technology capable of producing E1 grade environment-friendly urea-formaldehyde resin adhesives. However, the production stability is poo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J161/24C08G12/36B32B21/00
Inventor 时君友
Owner 时君友
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