CN106393358A - Fast growing wood compound modifier capable of enhancing light aging resistance - Google Patents

Abstract

The invention discloses a fast growing wood compound modifier capable of enhancing light aging resistance. The fast growing wood compound modifier is prepared from the following raw materials in parts by weight: 3 to 3.5 parts of formaldehyde, 2 to 3 parts of urea, 1.5 to 2 parts of hexamethylenetetramine, 0.02 to 0.03 part of maleic anhydride, a proper amount of acetic acid, a proper amount of ammonium hydroxide, a proper amount of deionized water, 20 to 23 parts of DMDHEU of which the solid content is 42wt%, 1.5 to 2 parts of magnesium chloride hexahydrate, 10 to 11 parts of silica sol, 2 to 3 parts of cordierite, 6 to 7 parts of a titanium dioxide solution, 0.8 to 1 part of hexadecyltrimethoxysilane, 0.3 to 0.4 part of stearic acid and 3 to 4 parts of nano zinc oxide. According to the fast growing wood compound modifier, the raw materials are simple, the components are safe, the technology is applicable to scale production, a prepared product can improve the mechanical property of the fast growing wood, the light aging resistance of the wood is improved, the service life of the product is prolonged, and the modified wood can be comparable with valuable wood and can be used for manufacturing of outdoor furniture.

Description

A kind of enhanced fast growing wood composite modifier of light aging resisting

Technical field

The present invention relates to Wood Property Improvement field, the enhanced fast growing wood of more particularly, to a kind of light aging resisting is changed with compound Property agent.

Background technology

Timber and wood materials, as the important means of production in social and economic construction, are not only widely used in daily life In every field, be also widely used for the industrial circles such as traffic, building and space flight.With the forest reserves in world wide increasingly Shortage, particularly precious timber quantity increasingly falls sharply, and the substantial amounts of quick growing species of trees is widely cultivated and meets in global range in recent years Wood supply.Compared with natural forest, by growth year is short etc., factor is limited the quick growing species of trees, leads to early late wood's difference very Greatly, material is loose, and mechanical property is poor, thus do not pass through to process artificial fast-growing forest timber be difficult to economical high used in Furniture manufacture etc. Added value field.Due to timber be a kind of natural there is porous macromolecular material, by the little, shapes of different fire and different company The tubular units of understanding and considerate condition are cross-linked and form, and have fluid-pervious, and its distinctive vesicular texture carries for Wooden modifying Supply basis.Physically or chemically modification is carried out to fast-growing forest, not only increases the economic value added of fast-growing forest, also Serve the effect of protection rare tree resource.Wooden modifying refers to using physics, the method such as chemical and mechanical to logs of wood Carry out manufacturability process, make physico-mechanical propertieses such as density of wood, hardness, intensity and dimensional stability etc. obtain good changing Kind.Chemical modification is modified Main Means, the selection of chemical impregnation medicinal liquid wherein in modifying process and the dipping of fast-growing forest The drying process of material is the research emphasis of Chinese scholars.But it is as the raising of living standards of the people and the increasing of environmental consciousness By force, to human health angle, the residual how reducing chemical impregnation medicinal liquid in modified material is chemical modification fast-growing forest Urgent problem, how by fast-growing forest functionalization improvement Study on Integration towards environmental protection and functionalization to be therefore The modified new direction of this paper and from now on fast-growing forest.

《Composite modifier is to quick growth poplar wood and Chinese toon wood Modification effect and study mechanism》Pass through independently low point of synthesis in one literary composition Son modification nitrogen footpath methyl performed polymer is combined with hydroxymethyl-2 dihydroxy-ethylene urea, makes many work(by adding plurality of stable agent Can type chemical modifier, preliminary study has been carried out to the timber physicochemical property after before modified and mechanism of modification, by impregnation drying Substantially, heat stability is improved the main mechanical strength improving effect of the modified material after process, and modifying agent is impregnated into wood simultaneously When material is internal, self-condensation effect can be occurred to form tridimensional network, it is higher that modifying agent serves as intensity in wood internal Implant is especially more obvious to dimensional stability and mechanical property improvement result.Although modified fast growing wood is in mechanics Increase in performance, but because it has not significantly affected fast growing wood furniture, open air out of doors to absorptive reduction The application of wooden clothing arts, needs its composite modifier to be modified further it is also desirable to other additional properties can be had To meet the demand to fast growing wood such as outdoor furniture.

Content of the invention

The object of the invention is exactly the defect in order to make up prior art, provides a kind of enhanced fast growing wood of light aging resisting to use Composite modifier.

The present invention is achieved by the following technical solutions：

A kind of enhanced fast growing wood composite modifier of light aging resisting, is made up of the raw material of following weight portion：Formaldehyde 3- 3.5th, carbamide 2-3, hexamethylenetetramine 1.5-2, maleic anhydride 0.02-0.03, appropriate acetic acid, appropriate ammonia, deionized water are fitted Amount, solid content are the hydroxymethyl-2 dihydroxy-ethylene urea 20-23 of 42wt%, Magnesium dichloride hexahydrate 1.5-2, Ludox 10-11, violet Cordierite 2-3, TiO 2 sol 6-7, hexadecyl trimethoxy silane 0.8-1, stearic acid 0.3-0.4, nano zine oxide 3- 4.

A kind of enhanced fast growing wood composite modifier of described light aging resisting, is made up of step in detail below：

（1）Formaldehyde, carbamide, hexamethylenetetramine are put in reactor, adds maleic anhydride, be heated to completely molten while stirring Solution, adds the deionized water of total amount 1.5-2 times amount, is heated to 70-80 DEG C, uses acetic acid and ammonia to adjust after stirring reaction 3-4 hour Section pH value is 7, terminates reaction；

（2）Cordierite is pulverized 200 mesh sieves mix with nano zine oxide, put in ball mill, add cetyl trimethoxy Base silane, stearic acid, are heated to discharging after 60-70 DEG C of mixing and ball milling 40-50 minute, add the deionized water of total amount 2-3 times amount In, turn/speed stirring 30-40 the minute of part with 600-800, be subsequently adding TiO 2 sol, ultrasonic disperse 40-50 minute is Can；

（3）The hydroxymethyl-2 dihydroxy-ethylene urea for 42wt% for the solid content is mixed with Ludox, with 500-600 rev/min of speed Step is added after stirring 10-15 minute（1）Step（2）The product obtaining and remaining residual components, continue ultrasonic disperse 15-20 Minute, obtain final product.

It is an advantage of the invention that：Formaldehyde, carbamide, hexamethylenetetramine are carried out reaction life by certain technique by the present invention Become performed polymer, then by being compounded with hydroxymethyl-2 dihydroxy-ethylene urea, Ludox, magnesium chloride, can after supersound process To form colloidal sol type composite modifier, wherein Si-0-Si framing structure plays Stabilization to modifier system, by timber Carry out impregnation process, timber pickling degree of modification can be significantly improved, improve the rate of body weight gain of timber；Composite modifier can be in wood It is scattered in the cell wall microcellular structure of timber well, with Wood chemical composition in subsequent heat drying in material dipping process In cellulose, hemicellulose, lignin etc. there is situ-gel polyreaction, chemical reaction finally makes the sense between them Group can connect formation covalent bond, and covalent bond is very firm, thus the bending strength of modified fast growing wood, Deflection Modulus of Elasticity and Parallel-to-grain compressive strength all improves a lot；Simultaneously composite modifier can also with the main chemical compositions cellulose of timber, half There is etherification reaction in cellulose and lignin, such reaction can reduce hydrophilic hydroxy group in timber, thus significantly reducing wood Material hygroscopicity.

The present invention is modified molten with titanium dioxide by hexadecyl trimethoxy silane by cordierite, nano oxidized property Glue mixes, and is added in the preparation of modifying agent, by being impregnated into the cell interior of fast growing wood, can not only play enhanced effect Really, hydrophobic performance is excellent simultaneously, and modifying agent can not only penetrate into wood internal moreover it is possible to one layer of wood surface performance is protected again Film, has superpower absorbability to ultraviolet, and can also be activated oxygen using luminous energy and form active oxygen, has and improves timber Light fastness stability and the great potential of fungicidal properties；Raw material of the present invention is simple, composition safety, and technique is suitable for large-scale production, system The product becoming can improve the mechanical property of fast growing wood, improve the light aging resisting property of timber, extend the use of product In the life-span, modified timber can be matched in excellence or beauty with famous and precious timber, can be used for the making of outdoor furniture.

Specific embodiment

A kind of enhanced fast growing wood composite modifier of light aging resisting, by following weight portion（Kilogram）Raw material preparation system Become：Formaldehyde 3, carbamide 2, hexamethylenetetramine 1.5, maleic anhydride 0.02, appropriate acetic acid, appropriate ammonia, appropriate deionized water, solid Content is the hydroxymethyl-2 dihydroxy-ethylene urea 20 of 42wt%, Magnesium dichloride hexahydrate 1.5, Ludox 10, cordierite 2, titanium dioxide Colloidal sol 6, hexadecyl trimethoxy silane 0.8, stearic acid 0.3, nano zine oxide 3.

A kind of enhanced fast growing wood composite modifier of described light aging resisting, is made up of step in detail below：

（1）Formaldehyde, carbamide, hexamethylenetetramine are put in reactor, adds maleic anhydride, be heated to completely molten while stirring Solution, adds the deionized water of total amount 1.5 times amount, is heated to 70 DEG C, and stirring reaction adjusts pH value with acetic acid and ammonia after 3 hours and is 7, terminate reaction；

（2）Cordierite is pulverized 200 mesh sieves mix with nano zine oxide, put in ball mill, add cetyl trimethoxy Base silane, stearic acid, are heated to the discharging after 40 minutes of 60 DEG C of mixing and ball milling, add in the deionized water of total amount 2 times amount, with 600 Turn/speed of part stirs 30 minutes, is subsequently adding TiO 2 sol, ultrasonic disperse 40 minutes；

（3）The hydroxymethyl-2 dihydroxy-ethylene urea for 42wt% for the solid content is mixed with Ludox, with 500 revs/min of speed stirring Step is added after 10 minutes（1）Step（2）The product obtaining and remaining residual components, continue ultrasonic disperse 15 minutes, obtain final product.

Fast growing wood is processed into the veneer of certain specification, being dried to moisture content is 6-10%, puts into vacuum pressure impregnation In tank, after being evacuated to -0.01MPa, keep 30-40 minute, be then rapidly injected modifying agent of the present invention, continue to keep 40-50 Minute, it is forced into 0.89-0.9 MPa afterwards and keep 15-20 minute；After sheet material is taken out, environment air dry disposed within is extremely aqueous Rate is less than 30%, is then placed in baking oven, first 6-8 hour is dried at 80-90 DEG C, then solidifies 4-5 hour at 120-130 DEG C, cold But discharging after obtains modified fast growing wood.Modified fast growing wood is compared with unmodified timber, Absolute Dry Density Improve 65.2%, bending strength improves 63.8%, parallel-to-grain compressive strength improves 17.0%, and whole water absorption rate reduces 34.3%.

Claims (2)

1. a kind of enhanced fast growing wood composite modifier of light aging resisting is it is characterised in that raw material system by following weight portion Prepare into：Formaldehyde 3-3.5, carbamide 2-3, hexamethylenetetramine 1.5-2, maleic anhydride 0.02-0.03, appropriate acetic acid, ammonia are fitted Amount, appropriate deionized water, solid content are the hydroxymethyl-2 dihydroxy-ethylene urea 20-23 of 42wt%, Magnesium dichloride hexahydrate 1.5-2, silicon Colloidal sol 10-11, cordierite 2-3, TiO 2 sol 6-7, hexadecyl trimethoxy silane 0.8-1, stearic acid 0.3-0.4, Nano zine oxide 3-4.

2. according to claim 1 a kind of enhanced fast growing wood composite modifier of light aging resisting it is characterised in that by with Lower concrete steps are made：

（1）Formaldehyde, carbamide, hexamethylenetetramine are put in reactor, adds maleic anhydride, be heated to completely molten while stirring Solution, adds the deionized water of total amount 1.5-2 times amount, is heated to 70-80 DEG C, uses acetic acid and ammonia to adjust after stirring reaction 3-4 hour Section pH value is 7, terminates reaction；

（2）Cordierite is pulverized 200 mesh sieves mix with nano zine oxide, put in ball mill, add cetyl trimethoxy Base silane, stearic acid, are heated to discharging after 60-70 DEG C of mixing and ball milling 40-50 minute, add the deionized water of total amount 2-3 times amount In, turn/speed stirring 30-40 the minute of part with 600-800, be subsequently adding TiO 2 sol, ultrasonic disperse 40-50 minute is Can；

（3）The hydroxymethyl-2 dihydroxy-ethylene urea for 42wt% for the solid content is mixed with Ludox, with 500-600 rev/min of speed Step is added after stirring 10-15 minute（1）Step（2）The product obtaining and remaining residual components, continue ultrasonic disperse 15-20 Minute, obtain final product.