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Branched polymer-urea-glyoxal copolycondensation resin as well as preparation method and application thereof

A technology of dialdehyde copolycondensation resin and branched polymer, which is used in aldehyde/ketone condensation polymer adhesives, adhesive types, adhesives, etc., can solve the problem of insufficient crosslinking degree of synthetic resin and difficult crosslinking There are no problems in system and water resistance, and the effect of obvious energy saving effect, low synthesis reaction temperature and improved water resistance is achieved.

Active Publication Date: 2021-09-03
SOUTHWEST FORESTRY UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The reason is that when glyoxal is used to replace formaldehyde synthetic resin under the existing process route, the function of glyoxal is not fully utilized, the degree of cross-linking of the synthetic resin is not enough, and it is difficult to form a dense cross-linking system, resulting in poor resin performance. Poor, especially almost no water resistance

Method used

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  • Branched polymer-urea-glyoxal copolycondensation resin as well as preparation method and application thereof
  • Branched polymer-urea-glyoxal copolycondensation resin as well as preparation method and application thereof
  • Branched polymer-urea-glyoxal copolycondensation resin as well as preparation method and application thereof

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preparation example Construction

[0034] The embodiment of the present invention also provides a preparation method of the above-mentioned branched polymer-urea-glyoxal co-condensation resin, comprising the following steps:

[0035] Step 1: making branched polyethyleneimine and urea undergo a grafting reaction to obtain a graft-modified branched polyethyleneimine polymerization product, which is denoted as HPEIU-1800;

[0036] Furthermore, HPEI is usually distinguished by average molecular weight, and the average molecular weight of HPEI products on the market is divided into 600, 800, 1800, 10,000, 70,000, etc. The above-mentioned HPEI is a commercially available product, the appearance is light yellow viscous liquid, the purity is above 95%, the pH value is 10-12, and it is stored at room temperature.

[0037] The average molecular weight of the branched polyethyleneimine used in the present invention is 1800. The reason for introducing HPEI is that the degree of cross-linking of urea-glyoxal co-condensatio...

Embodiment 1

[0049] (1) Under normal temperature conditions, the branched polyethyleneimine polymer with an average molecular weight of 1800 and urea (U1) are prepared according to the molar ratio of 1:6, and then added to the reaction vessel, and then condensed, refluxed, stirred, etc. Under the auxiliary device, continuously stir and heat to 95-100° C., and heat preservation reaction for 1 hour to prepare the grafted modified branched polyethyleneimine polymerization product. The discharged material is cooled and set aside, and it is recorded as HPEIU-1800.

[0050] (2) Under normal temperature conditions, take by weighing 100 grams of 40% glyoxal aqueous solution (G) and 25.86 grams of urea (U2) (molar ratio G:U2=1:1.6), join in the reaction vessel, Use 40% sodium hydroxide aqueous solution to adjust the pH value to 7.5-8.0, then heat the urea-glyoxal reaction system to 60°C under the conditions of heating in a water bath, stirring, and reflux, and keep the reaction for 1 hour, then hea...

Embodiment 2

[0052] (1) Under normal temperature conditions, the branched polyethyleneimine polymer with an average molecular weight of 1800 and urea (U1) are prepared according to the molar ratio of 1:8, and then added to the reaction vessel, and then condensed, refluxed, stirred, etc. Under the auxiliary device, continue stirring and heating to 95-100°C, and heat preservation reaction for 1 hour to prepare the grafted modified branched polyethyleneimine polymerization product, which is discharged to cool and set aside, which is designated as HPEIU-1800.

[0053] (2) Under normal temperature conditions, take 100 grams of concentration and be 40% glyoxal aqueous solution (G) and 24.37 grams of urea (U2) (molar ratio G:U2=1:1.7), join in the reaction vessel, Use 40% sodium hydroxide aqueous solution to adjust the pH value to 7.5-8.0, then heat the urea-glyoxal reaction system to 60°C under the conditions of heating in a water bath, stirring, and reflux, and keep the reaction for 1 hour, then...

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Abstract

The invention provides a branched polymer-urea-glyoxal copolycondensation resin and a preparation method thereof, and the preparation method comprises the following steps: 1, carrying out grafting reaction on branched polyethyleneimine and urea to obtain a grafted modified branched polyethyleneimine polymerization product marked as HPEIU-1800; 2, mixing a glyoxal aqueous solution with urea, adjusting the pH value to 7.5-8.0, carrying out a heating and thermal insulation reaction, adding the HPEIU-1800 synthesized in the step 1, and continuing the heating and thermal insulation reaction to obtain a target product. Due to the introduction of the branched polymer, the obtained resin has excellent bonding strength and water resistance. And no formaldehyde or organic solvent is used as synthetic raw materials, so the resin does not release formaldehyde and has excellent environmental protection property. The invention also provides an application of the resin in a wood adhesive.

Description

technical field [0001] The invention relates to the technical field of chemically synthesized resins, in particular to a branched polymer-urea-glyoxal co-condensation resin, a preparation method of the resin and its application in wood adhesives. Background technique [0002] As an important way to improve the utilization rate of wood, wood-based panels are mainly made of wood or wood fiber as raw materials under the existing technological conditions. After processing into a certain unit, they are hot-pressed under the action of adhesives and other additives. wood products. Among them, adhesive is an important indicator to determine the quality of wood-based panels. At present, the adhesives used in the production of wood-based panels are generally based on synthetic resins made of formaldehyde. This type of resin has excellent bonding strength and durability, but the only shortcoming is the release of formaldehyde from the products. In order to solve the problem of formal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G12/12C08G12/06C09J161/24
CPCC08G12/046C09J161/24
Inventor 王辉杜官本周晓剑
Owner SOUTHWEST FORESTRY UNIVERSITY
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