CN104672391B - The preparation method of water-resistant white latex - Google Patents

Abstract

The present invention provides a kind of preparation method of water-resistant white latex, is made up of following steps：Suitable quantity of water, and polyvinyl alcohol are taken, is mixed, heating so that polyvinyl alcohol is completely dissolved, insulation obtains solution A；Take under appropriate emulsifying agent, stirring condition, the emulsifying agent and remaining water are added in solution A, then be slowly added into proper amount of acetic acid vinyl acetate and appropriate composite initiator, heat up, insulation；Cooling；It is slowly added into remaining vinylacetate and remaining initiator again afterwards；Heating, insulation；Appropriate emulsifying agent, and polyvinyl acetate are added, is incubated, then cools down；Sodium acid carbonate is added, dibutyl phthalate, diethylene glycol dibenzoate, octanol, isopropanol is well mixed, obtains solution B；Remaining emulsifying agent etc. is added into solution B, is well mixed, insulation is cooled to room temperature, produces water-resistant white latex.Water-resistant white latex combination property prepared by the method for the present invention is superior.

Description

The preparation method of water-resistant white latex

Technical field

The present invention relates to white glue with vinyl technical field, more particularly to a kind of preparation method of water-resistant white latex.

Background technology

At present, the threshold industry of door and window is than relatively low, and industry competition is more chaotic, to improve the quality and market competition of product Power is, it is necessary to constantly be improved.The high-grade energy-conservation wooden doors and windows being widely used in external window of building engineering include：Pure timber Window, aluminium clad wood doors and windows, the big kind of wooden aluminium composite door and window three.It is interior and wooden aluminium composite door and window is heat insulated shape bar of aluminum alloy because of its outside Side is wooden decoration bar section, therefore is suitable for southern rainy, high temperature, moist weather conditions.Present domestic market processing and fabricating Secondary operation is wanted in the unreasonable structure of wooden aluminium composite door and window, aluminium layering assembling, and in Wind-Pressure Resistance, air-tightness and sound insulation, heat-insulated etc. Aspect of performance still there are substantial portion of energy loss nor highly desirable.

Wood furniture door and window increasingly sells well in the market, and market prospects extensively, in these products to use white glue with vinyl more, go out In the requirement of lifting product quality, the combination property to white glue with vinyl it is also proposed more harsh requirement.

Chinese invention patent 02109653.8 (publication date on November 19th, 2003) discloses a kind of powerful white latex, under Row composition is made：Polyvinyl alcohol, sodium hydroxide, starch, hydrochloric acid, formaldehyde, urea, water.This glue viscosity is high, and technique is simple； But not environmentally friendly enough, water resistance and adhesion strength do not reach good requirement.

Chinese invention patent application 02109653.8 (publication date on November 19th, 2003) discloses a kind of powerful white latex, Specifically by polyvinyl alcohol, sodium hydroxide, starch, hydrochloric acid, formaldehyde, urea, water composition, this white glue with vinyl frost resistance is good, is difficult to sink Form sediment, not stratified, technique is simple.But this glue contains formaldehyde and urea, environmental-protecting performance is poor.

Chinese invention patent application 201310012677.2 (publication date on January 14th, 2013) discloses a kind of modified polyvinyl acetate emulsion Glue, the modified latex includes vinylacetate, acrylic acid, butyl acrylate, initiator and emulsifying agent, obtained modified polyvinyl acetate emulsion Adhesiveness is big, can film forming at room temperature, adhesion strength is big, water-tolerant.The vinylacetate toxicity that this glue is used is big, no Enough environmental protection.

(the publication date of Chinese invention patent application 201410004735.1：On April 16th, 2014) disclose it is a kind of resistance to water-white Latex, described glue includes：PVAC polyvinylalcohol, vinylacetate VAC, acrylic acid AA, acrylamide AM, ammonium persulfate, the moon Ionic emulsifying agent A-102, alkyl polyoxyethylene ether LCN-287 nonionic emulsifiers；It is cornstarch, transparent powder, plasticizer, two sweet Alcohol dibenzoate DEDB, preservative KSG-201, sodium hydroxide and methanol；But this glue has still used tool virose Vinylacetate, environmental-protecting performance is poor.

Meanwhile, the related glue disclosed in the prior art combination property in using effect is also poor, it is impossible to meet market Harsh demand.

The content of the invention

The brief overview on the present invention is given below, to provide the basic reason on certain aspects of the invention Solution.It should be appreciated that this general introduction is not the exhaustive general introduction on the present invention.It is not intended to determine the key of the present invention Or pith, nor is it intended to limit the scope of the present invention.Its purpose only provides some concepts in simplified form, with This is used as the preamble in greater detail discussed later.

It is an object of the invention to overcome the deficiencies of the prior art and provide a kind of water-resistant white latex；The present invention's is resistance to water-white Latex environmental-protecting performance is high, excellent combination property.

The present invention relates to a kind of preparation method of water-resistant white latex, methods described is made up of following steps：By weight Take each component,

Step one, under stirring condition, suitable quantity of water, and polyvinyl alcohol are taken, is mixed, heating so that polyvinyl alcohol is completely molten Solution, insulation, obtains solution A；

Step 2, is taken under appropriate emulsifying agent, stirring condition, and the emulsifying agent and remaining water are added in solution A, then Proper amount of acetic acid vinyl acetate and appropriate composite initiator are slowly added into, is heated up, insulation；Cooling；It is slowly added into remaining vinegar again afterwards Vinyl acetate and remaining initiator；Heating, insulation；

Step 3, adds appropriate emulsifying agent, and polyvinyl acetate, and then insulation cools down；

Under step 4, stirring condition, sodium acid carbonate is added, dibutyl phthalate, diethylene glycol dibenzoate is pungent Alcohol, isopropanol is well mixed, obtains solution B；

Step 5, remaining emulsifying agent, allyl methacrylate, methacrylate ethylene glycol are added into solution B Ester, toluene di-isocyanate(TDI), NMA, waxy corn starch, sodium hypochlorite is well mixed, and insulation is cooled to room Temperature, produces water-resistant white latex.

Compared with existing, the present invention has following beneficial effect：Acetic acid second in white glue with vinyl prepared by the method for the present invention The content of alkene ester declines to a great extent, and without using formaldehyde equal solvent, fundamentally improves the environment-friendly type of product；It is simultaneously of the invention Glue done in thermal stability, just there is outstanding representation in time, water resistance, the index such as adhesion strength and hardening time, Combination property is superior, disclosure satisfy that the strict demand of high-grade energy-conservation wooden doors and windows quality.

Embodiment

Embodiments of the invention addressed below.The element and feature described in one embodiment of the invention can be with It is combined with the element and feature shown in one or more other embodiments.It should be noted that for purposes of clarity, saying The expression and description of part unrelated to the invention, known to persons of ordinary skill in the art and processing are eliminated in bright.

Embodiment 1

The present embodiment is related to a kind of water-resistant white latex and preparation method thereof；Water-resistant white latex includes each of following parts by weight Component：

Polyvinyl acetate 700,

Vinylacetate 300,

Polyvinyl alcohol 120,

Dibutyl phthalate 60,

Diethylene glycol dibenzoate 20,

Octanol 10,

Isopropanol 30,

Allyl methacrylate 10,

Ethyleneglycol dimethyacrylate 5,

Toluene di-isocyanate(TDI) 3,

Sodium acid carbonate 35,

Water 1400,

Emulsifying agent 40, emulsifying agent is enuatrol (i.e. sodium oleate)；

Composite initiator 5,

NMA 20,

Waxy corn starch 10,

Sodium hypochlorite 2,

The composite initiator is made up of each component of following part by weight：Potassium peroxydisulfate, ammonium persulfate, bisulfite Sodium, sodium peroxydisulfate, kaolinic part by weight is 3:1:2:1：1.

The each component being related in the present embodiment can be obtained by disclosed commercially available channel.Water-resistant white latex in the present embodiment Preparation method step it is as follows：

Step one, under stirring condition, taking the water of 50-73% percentage by weights, (water taken accounts for foregoing water-resistant white latex The ratio of the gross weight of composition component reclaimed water is 50-73%), and polyvinyl alcohol, mixing, it is warming up to 88-95 degree so that poly- second Enol is completely dissolved, and 1 hour is incubated under 70-80 degree, and regulation pH is 8-9, obtains solution A；

Step 2, taking the emulsifying agents of 30-40% percentage by weights, (weight for the emulsifying agent taken accounts for water-resistant white latex group The ratio of the gross weight of emulsifying agent is 30-40% in point), under stirring condition, the emulsifying agent and remaining water are added to solution A In, then be slowly added into the vinylacetates of 40-50% percentage by weights (weight for the vinylacetate taken accounts for water-fast Virgin's milk In glue component the ratio of the gross weight of vinylacetate be 40-50%) and the initiator of 40-50% percentage by weights (take The ratio that the weight of initiator accounts for the gross weight of initiator in water-resistant white latex component is 40-50%), 88-95 degree is warming up to, is incubated 0.3-0.5 hours；It is cooled to 60-70 degree；It is slowly added into remaining vinylacetate and remaining initiator again afterwards；It is warming up to 88-95 degree (DEG C), is incubated 0.2-0.4 hours；

Step 3, (weight for the emulsifying agent taken accounts for water-resistant white latex to the emulsifying agent of addition 30-40% percentage by weights The ratio of the gross weight of emulsifying agent is 30-40% in component), and polyvinyl acetate is incubated 0.2-0.4 hours under 88-95 degree, It is subsequently cooled to 40-50 degree (DEG C)；

Under step 4, stirring condition, sodium acid carbonate is added, dibutyl phthalate, diethylene glycol dibenzoate is pungent Alcohol, isopropanol is well mixed, obtains solution B；

Step 5, remaining emulsifying agent, allyl methacrylate, methacrylate ethylene glycol are added into solution B Ester, toluene di-isocyanate(TDI), NMA, waxy corn starch, sodium hypochlorite is well mixed, and 40-50 degree (DEG C) is protected It is warm 0.1-0.3 hours, room temperature is cooled to, water-resistant white latex is produced.

Embodiment 2

The present embodiment is related to a kind of water-resistant white latex, and the preparation method of water-resistant white latex is with reference to embodiment 1, water-resistant white latex Include each component of following parts by weight：

Polyvinyl acetate 1050,

Vinylacetate 350,

Polyvinyl alcohol 145,

Dibutyl phthalate 100,

Diethylene glycol dibenzoate 40,

Octanol 15,

Isopropanol 45,

Allyl methacrylate 25,

Ethyleneglycol dimethyacrylate 10,

Toluene di-isocyanate(TDI) 7,

Sodium acid carbonate 50,

Water 1500,

Emulsifying agent 50, emulsifying agent is neopelex；

Composite initiator 9,

NMA 32,

Waxy corn starch 15,

Sodium hypochlorite 7,

The composite initiator is made up of each component of following part by weight：Potassium peroxydisulfate, ammonium persulfate, bisulfite Sodium, sodium peroxydisulfate, kaolinic part by weight is 4:4:4:2：3.

Embodiment 3

The present embodiment is related to a kind of water-resistant white latex, and the preparation method of water-resistant white latex is with reference to embodiment 1, water-resistant white latex Include each component of following parts by weight：

Polyvinyl acetate 800,

Vinylacetate 315,

Polyvinyl alcohol 125,

Dibutyl phthalate 80,

Diethylene glycol dibenzoate 25,

Octanol 12,

Isopropanol 35,

Allyl methacrylate 15,

Ethyleneglycol dimethyacrylate 7,

Toluene di-isocyanate(TDI) 4,

Sodium acid carbonate 39,

Water 1450,

Emulsifying agent 45, emulsifying agent is neopelex；

Composite initiator 6,

NMA 25,

Waxy corn starch 12,

Sodium hypochlorite 4,

The composite initiator is made up of each component of following part by weight：Potassium peroxydisulfate, ammonium persulfate, bisulfite Sodium, sodium peroxydisulfate, kaolinic part by weight is 3.2:1.2:2.5:1.3：2.

Embodiment 4

The present embodiment is related to a kind of water-resistant white latex, and the preparation method of water-resistant white latex is with reference to embodiment 1, water-resistant white latex Include each component of following parts by weight：

Polyvinyl acetate 950,

Vinylacetate 335,

Polyvinyl alcohol 135,

Dibutyl phthalate 90,

Diethylene glycol dibenzoate 35,

Octanol 14,

Isopropanol 40,

Allyl methacrylate 22,

Ethyleneglycol dimethyacrylate 9,

Toluene di-isocyanate(TDI) 6,

Sodium acid carbonate 45,

Water 1480,

Emulsifying agent 48, emulsifying agent is neopelex；

Composite initiator 8,

NMA 29,

Waxy corn starch 14,

Sodium hypochlorite 6,

The composite initiator is made up of each component of following part by weight：Potassium peroxydisulfate, ammonium persulfate, bisulfite Sodium, sodium peroxydisulfate, kaolinic part by weight is 3.8:1.6:3.5:1.6：2.8.

Embodiment 5

The present embodiment is related to a kind of water-resistant white latex, and the preparation method of water-resistant white latex is with reference to embodiment 1, water-resistant white latex Include each component of following parts by weight：

Polyvinyl acetate 900,

Vinylacetate 330,

Polyvinyl alcohol 130,

Dibutyl phthalate 85,

Diethylene glycol dibenzoate 30,

Octanol 13,

Isopropanol 37,

Allyl methacrylate 19,

Ethyleneglycol dimethyacrylate 8,

Toluene di-isocyanate(TDI) 5,

Sodium acid carbonate 41,

Water 1460,

Emulsifying agent 46, emulsifying agent is neopelex；

Composite initiator 7,

NMA 27,

Waxy corn starch 13,

Sodium hypochlorite 5,

The composite initiator is made up of each component of following part by weight：Potassium peroxydisulfate, ammonium persulfate, bisulfite Sodium, sodium peroxydisulfate, kaolinic part by weight is 3.5:1.5:3:1.5：2.5.

Comparative example 1

The customary preparation methods of glue comprise the following steps in the prior art：300 parts of polyvinyl alcohol is taken, under stirring condition, 40 parts of neopelex is added, 800 parts of water is stirred 10-15 minutes；Add 450 parts of vinylacetate, 10 parts of persulfuric acid It is incubated under potassium, 65-70 degree and waits the basic disappearance that flows back, be warming up to 80-85 degree, adds 800 parts of vinylacetate, 10 parts of persulfuric acid Potassium, is warming up to 90-95 degree and is incubated 05-0.6 hours, be cooled to 50 degree, add 50 parts of dibutyl phthalate, sodium acid carbonate 10 Part, stir, cool down, obtain glue.

Implementation result

To verify the implementation result of the present invention, the test of following index is carried out：

1st, the subjective feeling of environmental-protecting performance, production and user；

2nd, thermal stability determination：Kept for 6 days under 50-60 degree, see whether to change, if occurring precipitating or gel is existing As more, then heat endurance is poorer；

3rd, timing is just done：Ligneous piece is taken, takes 6g glue to be evenly coated in ligneous piece surface, its drying time is observed；5 times Repeat, average；

4th, water resistance is determined：The ligneous piece of one group (2) same specification is taken, corresponding contact surface is pressed in each ligneous piece Every square metre of glue coating of 150g, the specification of each contact surface is 100mm*30mm, afterwards by the contact surface pair of Liang Ge ligneous pieces Compression should be overlapped, is spontaneously dried 12 hours, is soaked in 30-35 degree water, measure is come unglued the time；5 repetitions, average；

5th, adhesion strength is determined：The ligneous piece of one group (2) same specification is taken, corresponding contact surface is pressed in each ligneous piece Every square metre of glue coating of 150g, the specification of each contact surface is 100mm*30mm, afterwards by the contact surface pair of Liang Ge ligneous pieces Compression should be overlapped, closed assembly time is no more than 10 minutes, and contact surface applies 1Mpa pressure, at room temperature, installation time 12 hours, is released Place 12 hours, make a strength test again after pressure；5 repetitions, average；

6th, hardening time determines, and takes glue 10g, is positioned in beaker, heating water bath under 50-55 degree, stirring, determines it and consolidates The change time；5 repetitions, average.

Table 1

Table 1 is the experiment effect of each embodiment and comparative example, as shown in Table 1,1-5 of the embodiment of the present invention glue feature of environmental protection Comparative example 1 can be superior to, the equal tasteless of glue prepared by each embodiment, is produced and the subjective sensation of user is preferable, and analysis is former Cause, glue of the invention largely reduces the consumptions of vinylacetates in component, and vinegar is replaced with nontoxic polyvinyl acetate Vinyl acetate, has been obviously improved the environmental-protecting performance of glue；Due to polyvinyl acetate and vinylacetate property and differ, The technology stability in the performance and preparation process of glue is prepared for satisfaction, it is necessary to regulate and control polyvinyl acetate and vinylacetate Ratio in an OK range, while needing to emulsifying agent, the consumption of initiator also has specific requirement；The glue of the present invention By overall adjustment of formula, cooperateed between each component, realize and meanwhile using polyvinyl acetate come and vinyl acetate While ester lifts environmental-protecting performance, moreover it is possible to the unexpected technique effect being obviously improved of glue combination property is realized, with significant It is innovative.

Heat endurance index, 1-5 of embodiment of the present invention thermal stability is also superior to comparative example 1, and experimental observation is implemented Glue prepared by example 1-5 does not occur obvious sediment or gelatin phenomenon, glue prepared by embodiment 1-5 have above and below two layers of emulsion show As upper strata emulsion is more liquid, and lower floor's emulsion glue is sticky, and mobility is slightly weak, and thermal stability is excellent；Comparative example 1 is reviewed, After being kept for 25 days, there is more obvious gelatin phenomenon in glue, and thermal stability is poor.

First dry time index, as shown in Table 1,1-5 of the embodiment of the present invention first dry time is shorter than comparative example 1, when just doing Between it is shorter, illustrate that the performance of glue is more excellent；First dry for up to 50 minutes, the dry time at the beginning of the embodiment of the present invention of comparative example 1 It is up to 31 minutes, most short up to 20 minutes, it is much better than comparative example 1.

Water resistance index, as shown in Table 1, the water resistance that 1-5 of the embodiment of the present invention prepares glue are better than comparative example 1, resistance to It is aqueous at least to improve more than 2 times, with significant technique effect.

Adhesion strength index, as shown in Table 1, the adhesion strength index that comparative example 1 prepares glue are 5.34Mp, and of the invention The adhesion strength index of glue is prepared in more than 9.12Mp, 70.8% is at least improved, the wherein best embodiment 5 of performance is made Standby glue bonding intensity index has reached 9.92Mp, and performance boost is up to 85.8%, the technique effect being not desired to purpose.

Hardening time index, as shown in Table 1, the hardening time that comparative example 1 prepares glue are 450 seconds, prepared by embodiment 1-5 The hardening time of glue, the most short glue prepared for embodiment 5, hardening time foreshortened to 300 seconds, only within 414 seconds Prepare the glue curing time for comparative example 1 66.7% or so, significantly shorten the hardening time of glue, with significant technology It is progressive.

It in summary it can be seen, not only environmental-protecting performance is obviously improved glue performance prepared by 1-5 of the embodiment of the present invention, Er Qietong When realize being obviously improved for glue combination property, with unexpected technique effect.The indices embodied in table 1 are entered Row global alignment, it is found by the applicant that the glue of the index of embodiment 5 has most excellent performance on indices, undoubtedly embodiment 5 be highly preferred embodiment of the present invention.

With reference to the excellent effect of the present invention, applicant is illustrated to the component and technique of the present invention：The glue of the present invention For lifting environmental-protecting performance, the consumption for rationally reducing vinylacetate is employed, acetic acid is replaced with nontoxic polyvinyl acetate The technical thought of vinyl acetate, due to polyvinyl acetate and vinylacetate property and differ, prepare glue for satisfaction Technology stability in performance and preparation process is, it is necessary to regulate and control the ratio of polyvinyl acetate and vinylacetate, while necessary The selection of remaining component in concern system.Why applicant has to use polyvinyl acetate and acetic acid in same system Vinyl acetate, rather than vinylacetate is abandoned completely, it is because generally being given birth in the prior art using vinylacetate as raw material Glue is produced, the present invention retains in system enables to the technology of the present invention to have very strong promotion price using vinylacetate Value, enables to existing glue production manufacturer to be easy to receive this improved production technology, rather than brand-new production technology so that The technology of the present invention has good market application value；On the other hand the consideration of production cost is taken into account.

Applicant passes through many experiments, has been surprisingly found that, the weight ratio of polyvinyl acetate and vinylacetate is (700- 1050):(300-350) just realizes the goal of the invention of the present invention, final to prepare if the consumption of vinylacetate exceeds the ratio Glue environmental-protecting performance can not just be obviously improved, with the common glue environmental-protecting performance difference of prior art less, if poly-vinegar acid second The too high levels of alkene ester, then can cause preparation technology reaction stability to be deteriorated, and be difficult to control, and glue combination property is deteriorated, and causes The combination property of final glue can not be obviously improved.

Dibutyl phthalate and diethylene glycol dibenzoate are plasticizer, and the present invention is anti-to adapt to compound material System is answered, is employed while adding the way of dibutyl phthalate and diethylene glycol dibenzoate；Octanol and isopropanol, no Dissolving dibutyl phthalate and diethylene glycol dibenzoate are can be only used for, is conducive to improving the degree of adhesion of glue；Can also The effect of a part of defoamer is played, it is steady when being conducive to the glue of the present invention to prepare；Applicants contemplate that, phthalic acid two Butyl ester, diethylene glycol dibenzoate and octanol, four kinds of components of isopropanol constitute the small system of synergy together, can It is specific to meet the particular/special requirement that polyvinyl acetate reacts with vinylacetate as compound material combination polyvinyl alcohol, it is not only real Reaction system is showed steady, without using the remarkable efficacy of defoamer, moreover it is possible to effectively lift the bond properties of glue, for lifting most The index such as the adhesion strength of whole glue and hardening time has direct action effect.

Allyl methacrylate, ethyleneglycol dimethyacrylate and toluene di-isocyanate(TDI) have the work of adhesive With applicant dexterously selects this 3 kinds of materials, with reference to specific ratio, constitutes synergy system, is added in the suitable time In preparation technology system, the combination property of final glue is extremely considerably enhanced, and the stability to glue is not produced not Good influence, because the time for being added to reaction system is last, therefore does not also cause the preparation technology of glue to become increasingly complex, With significant technological progress.Meanwhile, common sense in the field, under normal circumstances in rational scope, the concentration of glue gets over Gao Ze Using effect is better, and to reduce cost, glue concentration prepared by many manufacturers is only 40% or so, and should be normally 50-60% or so；After glue dilution, its moisture is improved, and when in use, the moisture that glue contains can penetrate into ligneous piece, make Wood expansion is obtained, causes not combining between ligneous piece, causes serious product quality problem to occur.Therefore, for raising city The purpose of field competitiveness, can also keep its using effect to maintain an equal level with like product while rationally reduction finished product glue concentration, Undoubtedly there is huge market value.Glue prepared by the present invention is when being diluted to the degree of market like product, and related is viscous Knotting strength, hardening time, water resistance etc. knows to be significantly better than like product, and this greatly improves the market competition of product of the present invention Power, with huge market value, applicant's analysis, this and used in the system of the present invention " dibutyl phthalate, Diethylene glycol dibenzoate and octanol, isopropanol " and " allyl methacrylate, ethyleneglycol dimethyacrylate and toluene This 2 special synergistic combinations of diisocyanate " have vital contact, and this 2 collaboration systems are not only able to lifting The adhesive property of glue, is combined together, additionally it is possible to occurs further delicate synergy, further improves the bonding of glue Performance, significantly increases the market competitiveness that the present invention prepares glue.

With reference to the experiment effect of table 1, although embodiment 1-5 indices better than comparative example 1, embodiment 1-5 it Between also difference, analysis gets off, and implements 5 most preferred embodiments for being the present invention, it is seen then that the content selection of component is for index glue The final performance of water also has vital influence, so the innovative content selection for being also embodied in each component simultaneously of the present invention Aspect.

Certainly, because the requirement of the mentality of designing and goal of the invention of glue of the present invention, remaining of the invention compositional selecting and contain Amount selection is obviously also non-obvious, and those skilled in the art combine prior art and can readily occurred in absolutely not.This is at this Have further embodiment in terms of the preparation technology of invention glue, with reference to embodiments of the invention it can be seen that, preparation of the invention Method adds raw material by several times in batches using five step designs, and the percentage added has special scope, rather than using existing The conventional disposable addition of technology, this technique is adapted with the special proportioning of glue component of the present invention, only with using this Technique is planted, just can guarantee that the smooth sequential of reaction system is carried out, it is ensured that finally prepare the superior quality of glue.

The paste viscosity of waxy corn starch in itself is higher, and mobility is poor, and usability is poor；The present invention is simultaneously in composition In add waxy corn starch and sodium hypochlorite in proper proportions, utilize hypochlorite oxidation waxy corn starch, formed oxygen Change starch, paste viscosity reduction, mobility improves；The present invention with the addition of N hydroxymethyl acrylamide simultaneously；It has been found that simultaneously Add after waxy corn starch, sodium hypochlorite and N hydroxymethyl acrylamide, can further be obviously improved the comprehensive of glue Can, the adhesion strength and hardening time index of glue are significantly improved, and combination property is further improved；It is applicant's understanding that N- hydroxyls Methylol of the Methacrylamide rich in reactivity, can effectively lift the degree of adhesion of system；What waxy corn starch was changed into Oxidized starch has good mobility and stronger anti-shear stability, can further promote N hydroxymethyl acrylamide at this Fusion in invention system, and then the lifting of promotion system degree of adhesion；Meanwhile, oxidized starch also has preferably paste viscosity in itself, Also the effect of binder can be played, the adhesive power of system is lifted；Oxidized starch is transported with N hydroxymethyl acrylamide in system In dynamic process, also can mutually it bond, further the adhesive power of lifting system；It can be seen that, the present invention is ingenious to make use of wax beautiful Rice starch is changed into the characteristic that oxidized starch has, and not only realizes the effect of enhancing system bonding force, moreover it is possible to effectively lift N- Effect of NMA, can also occur interaction and bond with N hydroxymethyl acrylamide, collaboration improves system Integrated bond ability, realize unexpected technique effect.Because waxy corn starch is relatively stable in itself, thus it is of the invention Using waxy corn starch as raw material, it is easy to store and transports.

The present invention has selected composite initiator, the consumption of initiator and the bonding into branch's influence glue in reaction system Intensity, so needing the consumption of rationally control initiator；The inventors found that when selecting following composite initiator, this hair Bright system reacting balance, preferably, and adhesion strength has a further lifting for the stability of glue, the consumption of initiator can significantly under Drop；Specifically, the composite initiator system that the present invention is selected is as follows：Composite initiator is grouped by each group of following part by weight Into：Potassium peroxydisulfate, ammonium persulfate, sodium hydrogensulfite, sodium peroxydisulfate, kaolinic part by weight is (3.2-3.8):(1.2- 1.6):(2.5-3.5):(1.3-1.6)：(2-2.8)；In the composite initiator system of the present invention, potassium peroxydisulfate, ammonium persulfate, Sodium peroxydisulfate can be initiator, and sodium hydrogensulfite and kaolin can respectively with potassium peroxydisulfate, ammonium persulfate, sodium peroxydisulfate Redox system is constituted, this causes the composite initiator of the present invention to cover many initiator factors and redox factor, The collaboration system of complexity is formd, the smooth reaction of reaction system can be remarkably promoted；The composite initiator of the present invention overcomes Simple to use ammonium persulfate, system reaction rate is fast, and the problem of stability of emulsion is poor, moreover it is possible to lift the adhesion strength of glue promotees Enter the steady progress of reaction；Because the composite initiator component synergy of the present invention is complicated, therefore composite initiator of the present invention Each component ratio, and the ratio that composite initiator is accounted in composition need strict control, otherwise can cause composite initiator Effect degradation.The more single initiator of composite initiator of the present invention has declined, and effect is notable.

In summary, the content of vinylacetate declines to a great extent in the white glue with vinyl that prepared by method of the invention, and need not make Formaldehyde equal solvent is used, the environment-friendly type of product is fundamentally improved；The glue of the present invention is in thermal stability simultaneously, when just doing Between, water resistance has outstanding representation in the index such as adhesion strength and hardening time, and combination property is superior, disclosure satisfy that top grade Save the strict demand of wooden doors and windows' quality.

Finally it should be noted that：The above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although The present invention is described in detail with reference to the foregoing embodiments, it will be understood by those within the art that：It still may be used To be modified to the technical scheme described in foregoing embodiments, or equivalent substitution is carried out to which part technical characteristic； And these modification or replace, do not make appropriate technical solution be used for essence disengaging various embodiments of the present invention technical scheme spirit And scope.

Claims (1)

1. a kind of preparation method of water-resistant white latex, it is characterised in that methods described is made up of following steps：Take by weight Each component,

Polyvinyl acetate 700-1050,

Vinylacetate 300-350,

Polyvinyl alcohol 120-145,

Dibutyl phthalate 60-100,

Diethylene glycol dibenzoate 20-40,

Octanol 10-15,

Isopropanol 30-45,

Allyl methacrylate 10-25,

Ethyleneglycol dimethyacrylate 5-10,

Toluene di-isocyanate(TDI) 3-7,

Sodium acid carbonate 35-50,

Water 1400-1500,

Emulsifying agent 40-50,

Composite initiator 5-9,

NMA 20-32,

Waxy corn starch 10-15,

Sodium hypochlorite 2-7,

The composite initiator is made up of each component of following part by weight：Potassium peroxydisulfate, ammonium persulfate, sodium hydrogensulfite, mistake Sodium sulphate, kaolinic part by weight is (3-4):(1-2):(2-4):(1-2):(1-3)；

Step one, under stirring condition, the water of 50-73% percentage by weights, and polyvinyl alcohol are taken, mixes, is warming up to 88-95 Degree so that polyvinyl alcohol is completely dissolved, l hours are incubated under 70-80 degree, and regulation pH is 8-9, obtains solution A；

Step 2, is taken under the emulsifying agent of 30-40% percentage by weights, stirring condition, and the emulsifying agent and remaining water are added Into solution A, then it is slowly added into the vinylacetate and the compound of 40-50% percentage by weights of 40-50% percentage by weights and draws Agent is sent out, 88-95 degree is warming up to, 0.3-0.5 hours are incubated；It is cooled to 60-70 degree；It is slowly added into remaining vinyl acetate again afterwards Ester and remaining composite initiator；88-95 degree is warming up to, 0.2-0.4 hours are incubated；

Step 3, adds under the emulsifying agent of 30-40% percentage by weights, and polyvinyl acetate, 88-95 degree and is incubated 0.2- 0.4 hour, it is subsequently cooled to 40-50 degree；

Under step 4, stirring condition, sodium acid carbonate is added, dibutyl phthalate, diethylene glycol dibenzoate, octanol is different Propyl alcohol, is well mixed, obtains solution B；

Step 5, remaining emulsifying agent, allyl methacrylate, ethyleneglycol dimethyacrylate, first are added into solution B Phenylene diisocyanate, NMA, waxy corn starch, sodium hypochlorite is well mixed, 40-50 degree insulation 0.1-0.3 Hour, room temperature is cooled to, water-resistant white latex is produced.