CN104861924A - Modified castor protein adhesive agent preparation method - Google Patents
Modified castor protein adhesive agent preparation method Download PDFInfo
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- CN104861924A CN104861924A CN201510197913.1A CN201510197913A CN104861924A CN 104861924 A CN104861924 A CN 104861924A CN 201510197913 A CN201510197913 A CN 201510197913A CN 104861924 A CN104861924 A CN 104861924A
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Abstract
The invention discloses a modified castor protein adhesive agent preparation method which is as follows: castor seed meal castor residual after castor seed oil expression is put in alkaline environment for castor protein dissolving at 37 DEG C and protein precipitation at 4 DEG C according to different protein solubility of NaCl solution at different temperatures; castor separation protein is modified by urea with the concentration of 2 mol/L in 3% sodium polyphosphate solution, modifying PH value is 9, the temperature is 80 DEG C, the modification time is 1.5 hours; after cooling, 2% vital gluten is used for grafting modification of the modified castor protein, the modification temperature is 80 DEG C, the modification time is 1 hour, and then the modified castor protein adhesive agent is obtained. The modified castor protein adhesive agent is free of harmful substances such as formaldehyde and the like, simple and clean in production technology, and high in gluing strength, has certain amount of resistance to water, can meet the needs of the wood gluing, and reduces the gluing cost of the lumber industry.
Description
Technical field: the present invention relates to a kind of industrial sizing agent, the preparation method of a kind of modified castor albumen sizing agent specifically utilizing modified castor albumen to be raw material.
Technical background: sizing agent is the colloidal materials made for main body with macromolecular material that is natural or synthesis.At present, petroleum derivative class sizing agent occupies market dominant contribution.China produces as global woodwork, processing and the big country of trade, and conventional based Wood Adhesives is based on urea-formaldehyde resin and resol, and its gluing intensity, water resistance are better, the dark welcome by businessman.But this type of synthetic adhesive has when producing, transporting and using can discharge phenol and formaldehyde, bring environmental problem.In the last few years, sizing agent market is constantly expanded, the attention rate of people to the formaldehyde pollution problem in wood-based plate use procedure constantly heats up, and country has organized to set up a series of compulsory standard, defines the index of correlation of IAQ (indoor air quality) to ensure the health of the people.Therefore reduce the obnoxious flavour burst sizes such as the formaldehyde in wood-based plate, research aldehyde-free environment-friendly sizing agent has become the focus studied in the world.On the other hand, rising steadily of the non-renewable and petrochemicals price of petroleum resources, the Environment-friendlyadhesive adhesive of also an urgent demand developing low-cost solves the predicament that timber industry faces.
Albumen sizing agent carries out modification to protein, by changing the space structure of protein, improves the gluing characteristic of protein, to realize its application in wood working.The bonding action, stability of viscidity, water tolerance etc. of modified protein sizing agent are all more unmodified to make moderate progress, and what have even can match in excellence or beauty with business phenolic resin adhesive.
Castor-oil plant is a kind of oil plant cash crop, all has plantation all over the world.Castor seeds containing have an appointment 50% Viscotrol C, Viscotrol C viscosity is large, zero pour is low, burning-point is high, is desirable aviation oil, and in addition, Viscotrol C also has extensive use in medicine, weaving, light industry and chemical industry.Grouts after castor seeds oil expression contain rich in protein, through modified as modified protein sizing agent, can use for wood-gluing.The bonding property of protein adhesive is relevant with processing parameter with the surface properties of the character of albumin glue, timber.And protein can change the surface tissue of protein through modification, thus improve the bonding strength of albumen sizing agent, make it reach the requirement of strength of timber angle and industry.Protein modified method conventional at present has alkali modification, urea modification, graft modification and bio-modification etc.Albumin glue viscosity intensity wherein after alkali modification is higher, but can alkaline spot be produced after wood gluing, and water tolerance is not enough, urea modified protein sizing agent has good bonding property and certain water tolerance, when graft modification is used alone, bonding strength is not enough, and biological modified method is not perfect and modification efficiency unstable.Therefore, need with the method for modifying process castor bean meal albumen of comprehensive environmental protection, to make it have good tackiness and water tolerance.
Summary of the invention: the object of the invention is to solve the problem in above-mentioned wood gluing, provide production technique easy clean, environmental protection, gummed degree is strong, and water tolerance is high, reduces the preparation method of a kind of modified castor albumen sizing agent of wood industry gummed cost.
The technical scheme that the present invention is adopted for achieving the above object is: its modification method for preparing is:
1. take 2.7gNaCl, add water to 300ml, and stirring makes it dissolve, and is mixed with the NaCl solution of 0.15mol/L;
2. by castor-oil plant crusher for crushing 5 minutes, take and pulverize castor-oil plant 100g, add in NaCl solution, stir, in water-bath, 37 DEG C of constant temperature stir extraction 2 hours;
3. castor-oil plant system is used 8 layers of filtered through gauze while hot, retain filtrate, and filtrate to be saved in refrigerator 4 DEG C and to spend the night;
4. adopt salts solution to extract the precipitator method, utilize the different solubility of the differing temps of salts solution, make protein precipitation and be separated, Extracting temperature is 37 DEG C, and precipitation temperature remains on 4 DEG C, and separation method is centrifugal 5 minutes of 3000r/min, make protein precipitation solid-liquid separation, drying at room temperature, for subsequent use;
5. the modification of phosphorylation urea is under sodium polyphosphate is the condition of auxiliary agent, urea is used to carry out modification to ricin, take Estimation of Castor Protein Isolated 10g, add water to 50ml, and add 1.5g sodium polyphosphate and 6g urea, the concentration of sodium polyphosphate is 3%, urea concentration is 2mol/L, regulate pH value to be 9 by the NaOH solution of 1mol/L, in water-bath, modification temperature is that 80 DEG C of constant temperature stir, and modification time is 1.5 hours;
6. graft modification, modifying agent is gluten powder, adds 1g gluten powder in system, gluten powder concentration 2%, is that 80 DEG C of constant temperature stir after stirring with the temperature in water-bath, modification time 1 hour, obtained this modified castor albumen sizing agent.
The invention has the beneficial effects as follows:
1, the modified protein sizing agent that prepared by the present invention does not contain the obnoxious flavoures such as formaldehyde, and technique environmental protection is simple, and adhesive strength reaches the adhesive strength of existing market main product, is excellent Environment-friendlyadhesive adhesive.
2, utilize castor-oil plant to make modified protein sizing agent, replacing existing take soybean as the sizing agent of raw material, effectively can reduce the raw materials cost of sizing agent.
3, the solubleness of NaCl solution is utilized to carry out extraction and isolation to ricin, with low cost, and technique is simple to operation.
4, contrast is directly to castor-oil plant modification, utilizes Estimation of Castor Protein Isolated to make modified protein sizing agent, is stripped of the lignocellulose in castor-oil plant, effectively can improves the adhesive strength of sizing agent.
5, the urea-modified bonding strength that effectively can improve modified protein sizing agent, and the water resistance of albumen sizing agent can be improved to a certain extent.
6, the existence of alkaline environment and sodium polyphosphate can significantly improve the bonding strength of albumen sizing agent urea modification.
7, graft modification effectively can improve the water resistance of albumen sizing agent, and raising bonding strength to a certain degree.
Embodiment: embodiment 1: its modification method for preparing is:
1. take 2.7gNaCl, add water to 300ml, and stirring makes it dissolve, and is mixed with the NaCl solution of 0.15mol/L;
2. by castor-oil plant crusher for crushing 5 minutes, take and pulverize castor-oil plant 100g, add in NaCl solution, stir, in water-bath, 37 DEG C of constant temperature stir extraction 2 hours;
3. castor-oil plant system is used 8 layers of filtered through gauze while hot, retain filtrate, and filtrate to be saved in refrigerator 4 DEG C and to spend the night;
4. adopt salts solution to extract the precipitator method, utilize the different solubility of the differing temps of salts solution, make protein precipitation and be separated, Extracting temperature is 37 DEG C, and precipitation temperature remains on 4 DEG C, and separation method is centrifugal 5 minutes of 3000r/min, make protein precipitation solid-liquid separation, drying at room temperature, for subsequent use;
5. the modification of phosphorylation urea is under sodium polyphosphate is the condition of auxiliary agent, urea is used to carry out modification to ricin, take Estimation of Castor Protein Isolated 10g, add water to 50ml, and add 1.5g sodium polyphosphate and 6g urea, the concentration of sodium polyphosphate is 3%, urea concentration is 2mol/L, regulate pH value to be 9 by the NaOH solution of 1mol/L, in water-bath, modification temperature is that 80 DEG C of constant temperature stir, and modification time is 1.5 hours;
6. graft modification, modifying agent is gluten powder, adds 1g gluten powder in system, gluten powder concentration 2%, is that 80 DEG C of constant temperature stir after stirring with the temperature in water-bath, modification time 1 hour, obtained this modified castor albumen sizing agent.
Described modification method for preparing is that ricin is carried out the modification of phosphorylation urea and graft modification in the basic conditions.
Described alkaline condition, modification pH value is 9, regulates PH agents useful for same to be the NaOH of 1mol/L.
The solute of described salts solution is NaCl, and concentration is 0.15mol/L.
Embodiment 2: properties testing data of the present invention:
1, ricin separation test
Ricin structure is similar to soybean protein, is water-soluble protein, and salts solution can improve the solubleness of protein.The solubleness of protein first rises with the concentration of NaCl solution and declines afterwards, when NaCl concentration is 0.15mol/L, solubleness is the highest, when the solubleness of protein in salts solution is below 37 DEG C, raises and improve with temperature, when temperature is more than 37 DEG C, the sex change gradually of protein ash.
100g is pulverized the NaCl solution that castor-oil plant adds 0.15mol/L, 37 DEG C are extracted two hours, after filtration residue in refrigerator 4 DEG C spend the night, centrifugation albumen precipitation, weigh after dry, obtain protein 19.7g, extraction rate of protein is 19.7%.
2, ricin urea modification gummed strength trial
Take 3 portions of castor-oil plants and extract protein 10 g, add water to 50ml, modified condition is respectively: 1. natural PH add 6g urea; 2. add 6g urea, pH value is adjusted to 9; 3. add 1.5g sodium polyphosphate and 6g urea, pH value is adjusted to 9.3 groups of sizing agents were respectively at water-bath 80 DEG C of constant temperature whip modified 1.5 hours.
By 3 groups of sizing agents, uniform application is in the plank of 2cm × 5cm respectively, and application area is 2cm × 2cm, after having glued together, tests the tensile strength of its layback template with universal tensile testing machine.The tensile strength of three groups is Wei 1. 1.2MPa, 2. 1.5MPa, 3. 2.0MPa after tested, and the ricin sizing agent tensile strength of urea phosphorylation modification when pH value is 9 is the highest.
3, ricin graft modification water tolerance test
Take 3 portions of castor-oil plants and extract protein 10 g, add water to 50ml, modified condition is respectively: 1. natural PH add 6g urea, water-bath 80 DEG C of constant temperature whip modified 1.5 hours; 2. add 1.5g sodium polyphosphate and 6g urea, pH value is adjusted to 9, water-bath 80 DEG C of constant temperature whip modified 1.5 hours; 3. add 1.5g sodium polyphosphate and 6g urea, pH value is adjusted to 9, water-bath 80 DEG C of constant temperature whip modified 1.5 hours, after add 1g gluten powder, water-bath 80 DEG C of modifications 1 hour.
By 3 groups of sizing agents, uniform application is in the plank of 2cm × 5cm respectively, and application area is 2cm × 2cm, weighs after having glued together.Soak 1 hour in the water of 30 DEG C, mensuration of weighing after drying rate of weight loss, the rate of weight loss of three groups is respectively 1. 13.4%, and 2. 11.5%, 3. 7.6%.Ricin sizing agent water tolerance through graft modification is obviously better than other two groups, reaches the water-fast requirement of market sizing agent.
4, modified castor albumen sizing agent glue performance contrast experiment
Get 1. 500 seccotines, 2. market brand aldehydes based Wood Adhesives and 3. this modified castor albumen sizing agent respectively, by 3 groups of sizing agents difference uniform application in the plank of 2cm × 5cm, application area is 2cm × 2cm, after having glued together, test the tensile strength of its layback template with universal tensile testing machine.The tensile strength of three groups is respectively after tested, 1. 1.2MPa, 2. 2.4MPa, 3. 3.0MPa, wherein the gummed tensile strength of aldehydes based Wood Adhesives is the highest, and aldehydes based Wood Adhesives and modified castor albumen sizing agent all can reach the service requirements of wood working market sizing agent.
Claims (4)
1. a preparation method for modified castor albumen sizing agent, is characterized in that its modification method for preparing is:
1. take 2.7gNaCl, add water to 300ml, and stirring makes it dissolve, and is mixed with the NaCl solution of 0.15mol/L;
2. by castor-oil plant crusher for crushing 5 minutes, take and pulverize castor-oil plant 100g, add in NaCl solution, stir, in water-bath, 37 DEG C of constant temperature stir extraction 2 hours;
3. castor-oil plant system is used 8 layers of filtered through gauze while hot, retain filtrate, and filtrate to be saved in refrigerator 4 DEG C and to spend the night;
4. adopt salts solution to extract the precipitator method, utilize the different solubility of the differing temps of salts solution, make protein precipitation and be separated, Extracting temperature is 37 DEG C, and precipitation temperature remains on 4 DEG C, and separation method is centrifugal 5 minutes of 3000r/min, make protein precipitation solid-liquid separation, drying at room temperature, for subsequent use;
5. the modification of phosphorylation urea is under sodium polyphosphate is the condition of auxiliary agent, urea is used to carry out modification to ricin, take Estimation of Castor Protein Isolated 10g, add water to 50ml, and add 1.5g sodium polyphosphate and 6g urea, the concentration of sodium polyphosphate is 3%, urea concentration is 2mol/L, regulate pH value to be 9 by the NaOH solution of 1mol/L, in water-bath, modification temperature is that 80 DEG C of constant temperature stir, and modification time is 1.5 hours;
6. graft modification, modifying agent is gluten powder, adds 1g gluten powder in system, gluten powder concentration 2%, is that 80 DEG C of constant temperature stir after stirring with the temperature in water-bath, modification time 1 hour, obtained this modified castor albumen sizing agent.
2. the preparation method of a kind of modified castor albumen sizing agent according to claim 1, is characterized in that described modification method for preparing is that ricin is carried out the modification of phosphorylation urea and graft modification in the basic conditions.
3. the preparation method of a kind of modified castor albumen sizing agent according to claim 2, it is characterized in that described alkaline condition, modification pH value is 9, regulates PH agents useful for same to be the NaOH of 1mol/L.
4. the preparation method of a kind of modified castor albumen sizing agent according to claim 1, it is characterized in that the solute of described salts solution is NaCl, concentration is 0.15mol/L.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109825247A (en) * | 2019-03-07 | 2019-05-31 | 河南工业大学 | A kind of composite modified sesame protein adhesive and preparation method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100240805A1 (en) * | 2008-09-23 | 2010-09-23 | Miller Todd R | Adhesive compositions and process for preparing same |
| CN103421466A (en) * | 2012-05-23 | 2013-12-04 | 北京天工创道建筑科技有限公司 | Biomass composite glue and preparation method therefor |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100240805A1 (en) * | 2008-09-23 | 2010-09-23 | Miller Todd R | Adhesive compositions and process for preparing same |
| CN103421466A (en) * | 2012-05-23 | 2013-12-04 | 北京天工创道建筑科技有限公司 | Biomass composite glue and preparation method therefor |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109825247A (en) * | 2019-03-07 | 2019-05-31 | 河南工业大学 | A kind of composite modified sesame protein adhesive and preparation method thereof |
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Application publication date: 20150826 |