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

A urea-formaldehyde resin, an environmentally friendly technology, applied in adhesives, aldehyde/ketone condensation polymer adhesives, chemical instruments and methods, etc., can solve the problems of increased product quality risk, limited wide application, and reduced production efficiency. Achieve the effects of large social environmental benefits and economic benefits, process specifications, and easy operation

Inactive Publication Date: 2007-04-11
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; Poor pressure resistance (up to 2-4 hours at room temperature), and the bonding strength is in the cr

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-3

[0050] Example 1-3: Preparation of urea-formaldehyde resin in the present invention

[0051] The raw materials and amounts used in each embodiment are shown in Table 1

[0052] raw material name

Specification (purity)%

Example

1

2

3

F / U

mol ratio

Dosage

(kg)

F / U

mol ratio

Dosage

(kg)

F / U

mol ratio

Dosage

(kg)

Formaldehyde

Urea

Melamine

corn starch

Boric acid

Glyoxal

Formic acid

Sodium hydroxide

Industrial products (36.5%)

Industrial products (98%)

Industrial products (98%)

Industrial products (98%)

First class

Industrial products (42%)

Industrial grade (40%)

Industrial grade (40%)

0.8

①1.8

②1.25

③1.0

④0.8

3083

2870

1275

562

459

574

60

①30

②30

80

12

20

Right amount

Right amount

1.0

①2.0

②1.4

③1.1

④1.0

...

Embodiment 4-6

[0059] Example 4-6: Preparation of the curing agent in the present invention

[0060] The raw materials and amounts used in each example are shown in Table 2.

[0061] Example

4

5

6

Ammonium Chloride

150kg

180kg

200kg

Ferric chloride

80kg

120kg

150kg

Water

500kg

650kg

800kg

[0062] Preparation method: (Take Example 4 as an example, other examples are the same as Example 4 except for the amount of raw materials)

[0063] After grinding 150kg of ammonium chloride and 80kg of ferric chloride to a fine powder of 500 mesh or more, slowly and uniformly disperse them into 500kg of water at 40-60°C to obtain a curing agent.

Embodiment 7-12

[0064] Example 7-12: Application of the adhesive of the present invention

[0065] See Table 3 for the raw materials and amounts used in each example.

[0066] Example

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PUM

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Abstract

The adhesive of the present invention features the urea and formaldehyde in relatively low molar ratio of 0.8-1.03 and synthesized into urea-formaldehyde resin in an alkali-acid-alkali process, solid content of 48-55 %, viscosity of 80-120 mPa.s, pH 7.2-7.8, free formaldehyde content not higher than 0.1 %, and the composite curing agent of inorganic salt, inorganic acid and organic acid. It has the advantages of unique design, simple preparation process, no environmental pollution, low cost, etc. It may be used for various kinds of timber products.

Description

Technical field [0001] The invention relates to an improvement of a urea-formaldehyde resin adhesive and a preparation method thereof, in particular to a high-performance environment-friendly urea-formaldehyde resin adhesive, a preparation method and application thereof, and belongs to the technical field of adhesives in chemistry. Background technique [0002] Urea-formaldehyde resin adhesives are the most used adhesives in the wood industry, accounting for more than 80% of the adhesives used in this industry. my country launched the mandatory GB18580-2001 national standard on July 1, 2002, strictly restricting the release of indoor harmful substances, forcing the production pattern of urea-formaldehyde resins to change, and environmentally-friendly urea-formaldehyde resin adhesives are increasing rapidly. At present, there are technologies that can achieve the production of E1 environmentally friendly urea-formaldehyde resin adhesives in China, but the p...

Claims

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Application Information

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IPC IPC(8): C09J161/24C08G12/36B32B21/00
Inventor 时君友
Owner 时君友
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