CN105368359A - Sheet material oriented, high-strength, heat-resistance and modified urea-formaldehyde resin adhesive and preparation method therefor - Google Patents

Abstract

The present invention relates to the field of urea-formaldehyde resin adhesives, in particular to a sheet material oriented, high-strength, heat-resistance and modified urea-formaldehyde resin adhesive and a preparation method therefor. The adhesive comprises the following raw materials in parts by weight: 85-98 parts of aqueous formaldehyde solution(37%wt), an appropriate amount of 10% sodium hydroxide solution, 65-70 parts of urea, an appropriate amount of 10% tartaric acid solution, an appropriate amount of 10% ammonium chloride solution, 0.1-0.2 parts of 8-hydroxyquinoline, 5-8 parts of nano silica, 1-1.5 parts of N-methylolacrylamide, 0.1-0.2 parts of gamma-(2,3-epoxypropoxy)propyl trimethoxy silane, 2-3 parts of ethanol and 4-6 parts of polyvinyl alcohol; The adhesive of the present invention is synthesized under the condition of aqueous bath and nitrogen; polymerization efficiency is higher and residual monomer is less; and a modified composite powder comprising the nano silica and the 8-hydroxyquinoline is added stepwisely, so that strength and thermal aging resistance of the adhesive is improved. The adhesive has low formaldehyde emission and a high bonding speed, and is efficient and environmentally friendly.

Description

A kind of sheet material high strength heat resistant modified urea-formaldehyde resin glue sticks agent and preparation method thereof

Technical field

The present invention relates to urea-formaldehyde resin adhesive field, be specifically related to a kind of sheet material high strength heat resistant modified urea-formaldehyde resin glue and stick agent and preparation method thereof.

Background technology

Urea-formaldehyde resin adhesive is a kind of Application and Development thermosetting polymer sizing agent comparatively early, it is simple that it has technique, cohesive strength is high, the advantages such as water white transparency, be widely used in glued board, shaving board, medium density fibre board (MDF), the industries such as the production of artificial board and interior decoration, it is the main glue kind of current board industry, and urea-formaldehyde resin is with low cost, color is low, hardness is high, oil resistant, anti-mildew, there are the advantages such as good insulativity and temperature tolerance, also there is weathering resistance difference simultaneously, poor water resistance, to shortcomings such as Environment release formaldehyde, in order to adapt to the demand in market, the study on the modification of product seems particularly important.

Summary of the invention

A kind of sheet material high strength heat resistant modified urea-formaldehyde resin glue is the object of the present invention is to provide to stick agent and preparation method thereof, the sizing agent intensity prepared is high, not easily come unstuck cracking, low, the resistant to heat aging high-efficiency environment friendly product of free formaldehyde content, to achieve these goals, the technical solution used in the present invention is as follows:

A kind of sheet material high strength heat resistant modified urea-formaldehyde resin glue sticks agent, it is characterized in that, this urea-formaldehyde resin adhesive is made up of the raw material of following weight part: formalin (37%wt) 85-98,10% sodium hydroxide solution are appropriate, urea 65-70,10% tartaric acid solution appropriate, 10% ammonium chloride solution is appropriate, oxine 0.1-0.2, nano silicon 5-8, N hydroxymethyl acrylamide 1-1.5, γ-(2,3-glycidoxy) propyl trimethoxy silicane 0.1-0.2, ethanol 2-3, polyvinyl alcohol 4-6;

The preparation method of described urea-formaldehyde resin adhesive comprises following steps:

(1) be first dissolved in ethanol by oxine, gained solution and nano silicon, γ-(2,3-glycidoxy) propyl trimethoxy silicane mixing and stirring, obtain mixed powder for subsequent use;

(2) formalin is added in reaction vessel, and in reaction vessel, pass into nitrogen removing oxygen, then adding 10% sodium hydroxide solution adjust ph is 7.8-8.2, open whipping appts, and by reaction unit heating in water bath to 85-90 DEG C, mixed powder prepared by the step (1) of the urea and 4-6 weight part that then add 40-45 weight part, reaction 50-60min, drop into the urea of 8-9 weight part subsequently again, and add tartaric acid solution and sodium chloride solution weight ratio is the mixing solutions of 1:2, regulator solution pH value is 4.8-5.2, and constant temperature 80 DEG C reaction 30-40min, last is 7.5-7.8 by sodium hydroxide solution adjust ph again, and add leftover materials, be cooled to 55-60 DEG C, reaction 50-60min, less than 35 DEG C are cooled to after reaction terminates, discharging.

Beneficial effect of the present invention is:

First the present invention starts with from experimental installation, letting nitrogen in and deoxidizing in reaction process, get rid of the interference of oxygen, improve polymerization efficiency, reduce the residual of monomer, whole reaction process is carried out in a water bath simultaneously, whole reaction system is heated more even, reaction efficiency is higher, and free formaldehyde content reduces; The composite granule of the material such as nano silicon and oxine is progressively mixed in this external reaction process, the product cohesive strength that polymerization is generated and heat-proof aging ability all obtain lifting, the sizing agent bonding strength that the present invention obtains is high, bonding speed is fast, Formaldehyde emission rate is lower, character is also more stable, persistent high efficiency.

Embodiment

Embodiment

The sizing agent of the present embodiment is made up of the raw material of following weight part: formalin (37%wt) 92,10% sodium hydroxide solution is appropriate, urea 68,10% tartaric acid solution is appropriate, 10% ammonium chloride solution is appropriate, oxine 0.1, nano silicon 6, N hydroxymethyl acrylamide 1.2, γ-(2,3-glycidoxy) propyl trimethoxy silicane 0.1, ethanol 2.5, polyvinyl alcohol 5.

The preparation method of this sizing agent is:

(1) be first dissolved in ethanol by oxine, gained solution and nano silicon, γ-(2,3-glycidoxy) propyl trimethoxy silicane mixing and stirring, obtain mixed powder for subsequent use;

(2) formalin is added in reaction vessel, and in reaction vessel, pass into nitrogen removing oxygen, then adding 10% sodium hydroxide solution adjust ph is 8.0, open whipping appts, and by reaction unit heating in water bath to 90 DEG C, mixed powder prepared by the step (1) of the urea and 5 weight parts that then add 44 weight parts, reaction 50min, drop into the urea of 8 weight parts subsequently again, and add tartaric acid solution and sodium chloride solution weight ratio is the mixing solutions of 1:2, regulator solution pH value is 4.8, and constant temperature 80 DEG C reaction 40min, last is 7.6 by sodium hydroxide solution adjust ph again, and add leftover materials, be cooled to 55 DEG C, reaction 55min, less than 35 DEG C are cooled to after reaction terminates, discharging.

Obtained by the present embodiment, Product checking result is as follows:

The gelatin viscosity that this modified urea-formaldehyde resin glue sticks agent is 106.5mPa.s, and the purer urea-formaldehyde resin of free formaldehyde content on average reduces 88.6%, and hygrometric state bonding strength on average improves 98.6%, and dry state bonding strength improves 234.2%.

Claims (2)

1. a sheet material high strength heat resistant modified urea-formaldehyde resin glue sticks agent, it is characterized in that, this sizing agent is made up of the raw material of following weight part: formalin (37%wt) 85-98,10% sodium hydroxide solution are appropriate, urea 65-70,10% tartaric acid solution appropriate, 10% ammonium chloride solution is appropriate, oxine 0.1-0.2, nano silicon 5-8, N hydroxymethyl acrylamide 1-1.5, γ-(2,3-glycidoxy) propyl trimethoxy silicane 0.1-0.2, ethanol 2-3, polyvinyl alcohol 4-6.

2. a kind of sheet material high strength heat resistant modified urea-formaldehyde resin glue as claimed in claim 1 sticks the preparation method of agent, it is characterized in that, comprises following steps:

(1) be first dissolved in ethanol by oxine, gained solution and nano silicon, γ-(2,3-glycidoxy) propyl trimethoxy silicane mixing and stirring, obtain mixed powder for subsequent use;

(2) formalin is added in reaction vessel, and in reaction vessel, pass into nitrogen removing oxygen, then adding 10% sodium hydroxide solution adjust ph is 7.8-8.2, open whipping appts, and by reaction unit heating in water bath to 85-90 DEG C, mixed powder prepared by the step (1) of the urea and 4-6 weight part that then add 40-45 weight part, reaction 50-60min, drop into the urea of 8-9 weight part subsequently again, and add tartaric acid solution and sodium chloride solution weight ratio is the mixing solutions of 1:2, regulator solution pH value is 4.8-5.2, and constant temperature 80 DEG C reaction 30-40min, last is 7.5-7.8 by sodium hydroxide solution adjust ph again, and add leftover materials, be cooled to 55-60 DEG C, reaction 50-60min, less than 35 DEG C are cooled to after reaction terminates, discharging.