CN105111526A - Phyllosilicate/natural latex composite adhesive film and preparation method thereof - Google Patents
Phyllosilicate/natural latex composite adhesive film and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a phyllosilicate/natural latex composite adhesive film and a preparation method thereof. The composite adhesive film is mainly prepared from the following components: 142-167 parts by weight of natural latex with the solid content of at least 60%, 50-500 parts by volume of phyllosilicate dispersion solution with the density of 15-25 g/L, 1-5 parts by weight of vulcanizing agent, 1-5 parts by weight of zinc oxide, 0.1-0.5 part by weight of accelerator and 0.1-0.5 part by weight of dispersing agent. When the weight unit is kg, the volume unit is L. The phyllosilicate dispersion solution is prepared by the following steps: taking phyllosilicate, carrying out ultrasonic dispersion in an acid solution with the concentration of greater than or equal to 0.5 mol/L, taking a suspension, repeatedly washing with water until the pH value is approximately neutral, controlling the density of the phyllosilicate to 15-25 g/L, and regulating the pH value to 7-9. The adhesive film has excellent mechanical properties.
Description
Technical field
The present invention relates to the preparation method of natural rubber latex glued membrane, be specifically related to a kind of layered silicate/natural rubber latex compound cutan and preparation method thereof.
Background technology
Natural rubber latex has excellent over-all properties, and as film-forming matter is good, film physical strength is high, and elongation is high, good springiness, stores (particularly low tempertaure storage) stability and is easy to processing and sulfuration etc., being widely used at Latex Industry.But, natural rubber latex for the production of film article as natural rubber latex gloves time, due to tensile strength and tear-resistant performance undesirable, show great inferior position in the application.Therefore, for expanding the Application Areas of latex product, modification must be carried out to it, to improve the mechanical property of latex product.
In prior art, natural rubber latex modification mainly contains chemical modification and filler modified.Filler modifiedly be divided into nanometer particle-modified and non-nano particle modified, mainly improve the mechanical property of Natural Rubber Latex Products, as tensile strength and tear-resistant performance.At present, also there is not yet the layered silicate after using acid treatment carries out modification to natural rubber latex relevant report as filler.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of layered silicate/natural rubber latex compound cutan with excellent mechanical properties and preparation method thereof.
Layered silicate of the present invention/natural rubber latex compound cutan, it is made primarily of the component of following proportioning:
The natural rubber latex of solid content >=60%, 142 ~ 167 weight parts;
Density is the layered silicate dispersion liquid of 15 ~ 25g/L, 50 ~ 500 parts by volume;
Vulcanizing agent, 1 ~ 5 weight part;
Zinc oxide, 1 ~ 5 weight part;
Promotor, 0.1 ~ 0.5 weight part;
Dispersion agent, 0.1 ~ 0.5 weight part;
In said ratio, when in weight part, the unit of weight is chosen as kg, in parts by volume, the unit of volume is L;
Layered silicate dispersion liquid is prepared by the following method: get the acid solution ultrasonic disperse that layered silicate is placed in concentration >=0.5mol/L, get suspension water repetitive scrubbing to pH close to neutral, the density controlling layered silicate is 15 ~ 25g/L, adjust its pH=7 ~ 9 afterwards, namely obtain the layered silicate dispersion liquid that density is 15 ~ 25g/L.
In technique scheme, the consumption of the natural rubber latex of solid content >=60% is for obtaining by dry glue 100 weight part reckoning.When adopting solid content to be the natural rubber latex of 70%, its consumption is 142.9 weight parts; When adopting solid content to be the natural rubber latex of 60%, its consumption is 166.7 weight parts; When the solid content of natural rubber latex between 60 ~ 70% or other solid content time, calculate by mentioned above principle and can obtain its concrete consumption.
In order to improve the mechanical stability of natural rubber latex, the described raw material preparing layered silicate/natural rubber latex compound cutan preferably also comprises potassium hydroxide and/or the sodium hydroxide of 0.1 ~ 0.5 weight part (weight unit is chosen as kg), is more preferably the potassium hydroxide and/or sodium hydroxide that comprise 0.1 ~ 0.2 weight part (weight unit is chosen as kg).
In technique scheme, the proportion optimization of each component is:
The natural rubber latex of solid content >=60%, 142 ~ 167 weight parts;
Density is the layered silicate dispersion liquid of 15 ~ 25g/L, 100 ~ 500 parts by volume;
Vulcanizing agent, 1 ~ 2 weight part;
Zinc oxide, 1 ~ 2 weight part;
Promotor, 0.1 ~ 0.2 weight part;
Dispersion agent, 0.1 ~ 0.2 weight part.
In technique scheme, described vulcanizing agent is stearic acid and/or sulphur, when vulcanizing agent be chosen as the combination of stearic acid and sulphur time, the proportioning of stearic acid and sulphur can be any proportioning.
In technique scheme, described promotor can be any one or the two or more combination that are selected from N-ethyl, N-phenyl zinc dithiocarbamate (promotor PX), zinc diethyldithiocarbamate (promotor ZDC) and N-cyclohexyl-2-benzothiazole sulfonamide (accelerant CZ), when promotor is above-mentioned two or more selection, the proportioning between them can be any proportioning.
In technique scheme, described dispersion agent is Dispersant MF (dispersing agent MF) and/or dispersion agent NF (sodium metnylene bis-naphthalene sulfonate), when dispersion agent be chosen as the combination of Dispersant MF and dispersion agent NF time, the proportioning of Dispersant MF and dispersion agent NF can be any proportioning.
In the preparation method of the layered silicate dispersion liquid that technique scheme relates to, described acid solution is preferably nitric acid, sulfuric acid or salt aqueous acid, and the concentration of described acid solution is preferably 0.5 ~ 2mol/L; The consumption of described acid solution is wanted usually can the consumption of submergence layered silicate, and the ratio being preferably layered silicate and acid solution is: 1g:10 ~ 30ml.The time of described ultrasonic disperse is generally 1 ~ 3h, and ultrasonic disperse can carry out under normal temperature or heating condition, preferably carries out in a heated condition, more preferably carries out under 50 ~ 70 DEG C of conditions.Complete ultrasonic disperse in acid solution after, after gained dispersion liquid leaves standstill (being generally 6 ~ 12h), (suspension is positioned at middle layer to collection suspension wherein, upper strata is bubble, lower floor is quartzy impurity), afterwards suspension is used water repetitive scrubbing, usually pH=6 ~ 6.5 are washed with water to, the most of water of removing (usually adopting settling process to remove most of water) after washing each time, in water removal operation the last time after washing, controlling the density of layered silicate in this individual system of layered silicate dispersion liquid is 15 ~ 25g/L, applicant finds, only have when mixing with natural rubber latex etc. in the layered silicate dispersion liquid in the above-mentioned density range of process, layered silicate could disperse evenly in system, thus make the glued membrane obtained obtain excellent mechanical property.Preferably controlling the density of layered silicate in this individual system of layered silicate dispersion liquid is further 20g/L.After water washing operations, normally regulate the pH value of washing gained layered silicate dispersion liquid to meta-alkalescence with ammoniacal liquor, preferably its pH value is adjusted to 7 ~ 8.
In technical solutions according to the invention, involved layered silicate refers to sepiolite and/or attapulgite.
The present invention also comprises the preparation method of above-mentioned layered silicate/natural rubber latex compound cutan, specifically comprises the following steps:
1) the acid solution ultrasonic disperse that layered silicate is placed in concentration >=0.5mol/L is got, get suspension water repetitive scrubbing to pH close to neutral, the density controlling layered silicate is 15 ~ 25g/L, adjusts its pH=7 ~ 9 afterwards, obtains the layered silicate dispersion liquid that density is 15 ~ 25g/L;
2) by the layered silicate dispersion liquid that formula takes the natural rubber latex of solid content >=60%, density is 15 ~ 25g/L, vulcanizing agent, zinc oxide, promotor and dispersion agent, mixing, carries out prevulcanized, obtains prevulcanized latex; Gained prevulcanized latex is technique salivation film forming, afterwards drying, sulfuration routinely, namely obtains layered silicate/natural rubber latex compound cutan.
The step 1 of above-mentioned preparation method) in, described acid solution is preferably nitric acid, sulfuric acid or salt aqueous acid, and the concentration of described acid solution is preferably 0.5 ~ 2mol/L; The consumption of described acid solution is wanted usually can the consumption of submergence layered silicate, and the ratio being preferably layered silicate and acid solution is: 1g:10 ~ 30ml.The time of described ultrasonic disperse is generally 1 ~ 3h, and ultrasonic disperse can carry out under normal temperature or heating condition, preferably carries out in a heated condition, more preferably carries out under 50 ~ 70 DEG C of conditions.Complete ultrasonic disperse in acid solution after, after gained dispersion liquid leaves standstill (being generally 6 ~ 12h), (suspension is positioned at middle layer to collection suspension wherein, upper strata is bubble, lower floor is quartzy impurity), afterwards suspension is used water repetitive scrubbing, usually pH=6 ~ 6.5 are washed with water to, the most of water of removing (usually adopting settling process to remove most of water) after washing each time, in water removal operation the last time after washing, controlling the density of layered silicate in this individual system of layered silicate dispersion liquid is 15 ~ 25g/L, applicant finds, only have when mixing with natural rubber latex etc. in the layered silicate dispersion liquid in the above-mentioned density range of process, layered silicate could disperse evenly in system, thus make the glued membrane obtained obtain excellent mechanical property.Preferably controlling the density of layered silicate in this individual system of layered silicate dispersion liquid is further 20g/L.After water washing operations, normally regulate the pH value of washing gained layered silicate dispersion liquid to meta-alkalescence with ammoniacal liquor, preferably its pH value is adjusted to 7 ~ 8.
The step 2 of above-mentioned preparation method) in, described prevulcanized and vulcanisation operation are all same as the prior art, and preferably, prevulcanized stirs 3 ~ 5h under 60 ~ 70 DEG C of water bath condition, and sulfuration is curing time 30 ~ 60min under 90 ~ 120 DEG C of conditions.
Compared with prior art, feature of the present invention is:
1, the layered silicate of the present invention's employing after acid treatment and within the scope of specific density is as the filler of natural rubber latex, when mixing with natural rubber latex, ensures that layered silicate is evenly dispersed in natural rubber latex; In the film process of follow-up natural rubber latex, micelle breaks, natural rubber molecule is attracted to layered silicate surface, enhance the interface performance of layered silicate and rubber, and layered silicate is staple fibre structure, when compound cutan sample is subject to force-extension, rubber molecular chain is along Impact direction generation deformation, layered silicate fibrous bundle generation orientation simultaneously in rubber matrix, serve the effect bearing and disperse external force, thus make compound cutan show excellent mechanical property, wherein tear strength and stress at definite elongation show the most obvious.
2, the method for the invention is simple to operation, is easy to industrialization.
Accompanying drawing explanation
Fig. 1 is scanning electron microscope (SEM) photo of layered silicate (sepiolite fibre bundle) prepared by the embodiment of the present invention 1.
Fig. 2 is the SEM photo of layered silicate/natural rubber latex compound cutan Tensile fracture prepared by the embodiment of the present invention 1.
Embodiment
Below in conjunction with specific embodiment, the present invention is described in further detail, and to understand content of the present invention better, but the present invention is not limited to following examples.
Embodiment 1
1) take 20 grams of sepiolite original ore powders (100 ~ 200 order) and be placed in beaker, add the hydrochloric acid soln 400ml of 1mol/L, after stirring 15min, ultrasonic disperse 2h under 70 DEG C of conditions.Suspension is got after leaving standstill 12h, use deionized water repetitive scrubbing, the density controlling sepiolite in drying process after last washing (pH=6.5) is 20g/L, then with the ammoniacal liquor of 1mol/L, its pH value is adjusted to 8, obtains 20g/L sepiolite dispersion liquid; Get part sepiolite dispersion liquid and carry out drying, as shown in Figure 1, as shown in Figure 1, gained sepiolite is staple fibre shape to the SEM photo of gained powder, light weight and soft, presents diameter 50 ~ 150nm, the fibrous bundle that length is 1 ~ 5 μm;
2) 166.7g concentrated natural latex (solid content 60%) is taken, add sulphur 1g, zinc oxide 0.5g, promotor PX0.1g, promotor ZDC0.01g, dispersion agent NF0.1g, potassium hydroxide 0.1g, 150ml step 1 subsequently) obtained sepiolite dispersion liquid, under 60 DEG C of water bath condition, stir 4h, obtain pre-vulcanized natural latex; Filter with 80 mesh filter screens afterwards, after leaving standstill froth breaking, technique salivation film forming routinely, at room temperature dry, then put into 90 DEG C of baking oven sulfuration 1h, obtained fibrous sepiolite/natural rubber latex compound cutan.
As shown in Figure 2, by emulsion dispersion, sepiolite to be dispersed in rubber matrix and can to keep original fibrous texture the SEM photo of the present embodiment gained compound cutan Tensile fracture; Sepiolite fibre Shu Jiben is coated by rubber matrix, and both bonding interfaces are good.
After testing, (tensile strength, stress at definite elongation and tensile yield are by GB/T528-2009 standard testing for the tensile strength of the fibrous sepiolite that the present embodiment obtains/natural rubber latex compound cutan, tear strength, tensile yield and 500% stress at definite elongation, tear strength presses GB/T529-2008 standard testing, lower with) be respectively 22.32MPa, 56.95kN/m, 785% and 3.83MPa.
Comparative example 1
1) take 20 grams of sepiolite original ore powders (100 ~ 200 order) and be placed in beaker, add deionized water 400ml, after stirring 15min, ultrasonic disperse 2h under 70 DEG C of conditions, then with the ammoniacal liquor of 1mol/L, its pH value is adjusted to 8, obtains the sepiolite dispersion liquid that density is 20g/L;
2) 166.7g concentrated natural latex (solid content 60%) is taken, add sulphur 1g, zinc oxide 0.5g, promotor PX0.1g, promotor ZDC0.01g, dispersion agent NF0.1g, potassium hydroxide 0.1g, 150ml step 1 subsequently) obtained sepiolite dispersion liquid, under 60 DEG C of water bath condition, stir 4h, obtain pre-vulcanized natural latex; Filter with 80 mesh filter screens afterwards, after leaving standstill froth breaking, technique salivation film forming routinely, at room temperature dry, then put into 90 DEG C of baking oven sulfuration 1h, obtained sepiolite/natural rubber latex compound cutan.
After testing, the tensile strength of fibrous sepiolite/natural rubber latex compound cutan of obtaining of this comparative example, tear strength, tensile yield and 500% stress at definite elongation are respectively 18.13MPa, 42.64kN/m, 756% and 2.68MPa.
Comparative example 2
1) take 20 grams of sepiolite original ore powders (100 ~ 200 order) and be placed in beaker, add the hydrochloric acid soln 400ml of 1mol/L, after stirring 15min, ultrasonic disperse 2h under 70 DEG C of conditions.Suspension is got after leaving standstill 12h, use deionized water repetitive scrubbing, the density controlling sepiolite in drying process after last washing (pH=6.5) is 10g/L, then with the ammoniacal liquor of 1mol/L, its pH value is adjusted to 8, obtains the sepiolite dispersion liquid that density is 10g/L;
2) 166.7g concentrated natural latex (solid content 60%) is taken, add sulphur 1g, zinc oxide 0.5g, promotor PX0.1g, promotor ZDC0.01g, dispersion agent NF0.1g, potassium hydroxide 0.1g, 150ml step 1 subsequently) obtained sepiolite dispersion liquid, under 60 DEG C of water bath condition, stir 4h, obtain pre-vulcanized natural latex; Filter with 80 mesh filter screens afterwards, after leaving standstill froth breaking, technique salivation film forming routinely, at room temperature dry, then put into 90 DEG C of baking oven sulfuration 1h, obtained sepiolite/natural rubber latex compound cutan.
After testing, the tensile strength of fibrous sepiolite/natural rubber latex compound cutan of obtaining of this comparative example, tear strength, tensile yield and 500% stress at definite elongation are respectively 16.33MPa, 39.54kN/m, 726% and 2.37MPa.
Comparative example 3
1) take 20 grams of sepiolite original ore powders (100 ~ 200 order) and be placed in beaker, add the hydrochloric acid soln 400ml of 1mol/L, after stirring 15min, ultrasonic disperse 2h under 70 DEG C of conditions.Suspension is got after leaving standstill 12h, use deionized water repetitive scrubbing, the density controlling sepiolite in drying process after last washing (pH=6.5) is 30g/L, then with the ammoniacal liquor of 1mol/L, its pH value is adjusted to 8, obtains the sepiolite dispersion liquid that density is 30g/L;
2) 166.7g concentrated natural latex (solid content 60%) is taken, add sulphur 1g, zinc oxide 0.5g, promotor PX0.1g, promotor ZDC0.01g, dispersion agent NF0.1g, potassium hydroxide 0.1g, 150ml step 1 subsequently) obtained sepiolite dispersion liquid, because sepiolite gelatinization is serious, join in natural rubber latex and produce the even breakdown of emulsion that flocculates.
Embodiment 2
1) take 20 grams of sepiolite original ore powders (120 ~ 200 order) and be placed in beaker, add the hydrochloric acid soln 400ml of 1mol/L, after stirring 15min, ultrasonic disperse 2h under 70 DEG C of conditions.Suspension is got after leaving standstill 12h, use deionized water repetitive scrubbing, the density controlling sepiolite in drying process after last washing (pH=6.2) is 20g/L, then with the ammoniacal liquor of 1mol/L, its pH value is adjusted to 8, obtains 20g/L sepiolite dispersion liquid;
2) 166.7g concentrated natural latex (solid content 60%) is taken, add sulphur 1g, zinc oxide 0.5g, promotor PX0.1g, promotor ZDC0.01g, dispersion agent NF0.1g, 150ml step 1 subsequently) obtained sepiolite dispersion liquid, under 60 DEG C of water bath condition, stir 4h, obtain pre-vulcanized natural latex; Filter with 80 mesh filter screens afterwards, after leaving standstill froth breaking, technique salivation film forming routinely, at room temperature dry, then put into 90 DEG C of baking oven sulfuration 1h, obtained fibrous sepiolite/natural rubber latex compound cutan.
After testing, the tensile strength of fibrous sepiolite/natural rubber latex compound cutan that this enforcement is obtained, tear strength, tensile yield and 500% stress at definite elongation are respectively 22.17MPa, 55.42kN/m, 778% and 3.69MPa.
Embodiment 3
1) take 20 grams of sepiolite original ore powders (20 ~ 80 order) and be placed in beaker, add the sulphuric acid soln 300ml of 1.5mol/L, after stirring 5min, ultrasonic disperse 2.5h under 60 DEG C of conditions.Suspension is got after leaving standstill 12h, use deionized water repetitive scrubbing, the density controlling sepiolite in drying process after last washing (pH=6.0) is 20g/L, then with the ammoniacal liquor of 1mol/L, its pH value is adjusted to 8.5, and obtaining density is 20g/L sepiolite dispersion liquid;
2) 166.7g concentrated natural latex (solid content 60%) is taken, add sulphur 1g, zinc oxide 0.5g, promotor PX0.1g, promotor ZDC0.1g, Dispersant MF 0.1g, potassium hydroxide 0.2g, 100ml step 1 subsequently) obtained sepiolite dispersion liquid, 60 DEG C of heating in water bath, stir 4h, obtain pre-vulcanized natural latex, filter with 80 mesh filter screens, after leaving standstill froth breaking, technique salivation film forming routinely, at room temperature dry, then 110 DEG C of baking oven sulfuration 1h are put into, obtained fibrous sepiolite/natural rubber latex compounded latex glued membrane.
After testing, the tensile strength of fibrous sepiolite/natural rubber latex compound cutan that this enforcement is obtained, tear strength, tensile yield and 500% stress at definite elongation are respectively 21.35MPa, 52.57kN/m, 825% and 2.39MPa.
Embodiment 4
1) take 20 grams of attapulgites (80 ~ 100 order) and be placed in beaker, add the salpeter solution 400ml of 1mol/L, after stirring 10min, ultrasonic disperse 3h under 50 DEG C of conditions.Suspension is got after leaving standstill 12h, use deionized water repetitive scrubbing, the density controlling attapulgite in drying process after last washing (pH=6.3) is 20g/L, then with the ammoniacal liquor of 1mol/L, its pH value is adjusted to 9.0, obtains the attapulgite dispersion liquid that density is 20g/L;
2) 166.7g concentrated natural latex (solid content 60%) is taken, add sulphur 1g, zinc oxide 0.5g, promotor PX0.1g, promotor ZDC0.01g, dispersion agent NF0.1g, potassium hydroxide 0.1g, 150ml step 1 subsequently) obtained attapulgite dispersion liquid, 60 DEG C of heating in water bath, stir 4h, obtain pre-vulcanized natural latex, filter with 80 mesh filter screens, after leaving standstill froth breaking, technique salivation film forming routinely, at room temperature dry, then 90 DEG C of baking oven sulfuration 1h are put into, obtained attapulgite/natural rubber latex compounded latex glued membrane.
After testing, the tensile strength of attapulgite/natural rubber latex compound cutan of obtaining of the present embodiment, tear strength, tensile yield and 500% stress at definite elongation are respectively 26.25MPa, 59.74kN/m, 763% and 4.12MPa.
Embodiment 5
Take 20 grams of attapulgites (80 ~ 160 order) and be placed in beaker, add the hydrochloric acid soln 300ml of 1.5mol/L, ultrasonic disperse 2.5h under 60 DEG C of conditions.Suspension is got after leaving standstill 12h, use deionized water repetitive scrubbing, the density controlling attapulgite in drying process after last washing (pH=6.0) is 20g/L, then with the ammoniacal liquor of 1mol/L, its pH value is adjusted to 7.5, obtains the attapulgite dispersion liquid that density is 20g/L;
Take 166.7g concentrated natural latex (solid content 60%), add sulphur 1g, zinc oxide 0.5g, promotor PX0.1g, promotor ZDC0.1g, Dispersant MF 0.1g, potassium hydroxide 0.2g, 100ml step 1 subsequently) obtained attapulgite dispersion liquid, 60 DEG C of heating in water bath, stir 4h, obtain pre-vulcanized natural latex, filter with 80 mesh filter screens, after leaving standstill froth breaking, technique salivation film forming routinely, at room temperature dry, then 110 DEG C of baking oven sulfuration 1h are put into, obtained attapulgite/natural rubber latex compounded latex glued membrane.
The tensile strength of the attapulgite that the present embodiment obtains/natural rubber latex compound cutan, tear strength, tensile yield and 500% stress at definite elongation are respectively 25.76MPa, 57.69kN/m, 798% and 3.56MPa.
Embodiment 6
1) take 20 grams of sepiolite original ore powders (60 ~ 100 order) and be placed in beaker, add the hydrochloric acid soln 600ml of 0.5mol/L, ultrasonic disperse 1h under 70 DEG C of conditions.Suspension is got after leaving standstill 12h, use deionized water repetitive scrubbing, the density controlling sepiolite in drying process after last washing (pH=6.5) is 20g/L, then with the ammoniacal liquor of 2mol/L, its pH value is adjusted to 8.2, and obtaining density is 20g/L sepiolite dispersion liquid;
2) 142.9g concentrated natural latex (solid content 70%) is taken, add sulphur 2g, zinc oxide 1g, promotor PX0.1g, promotor ZDC0.3g, accelerant CZ 0.1g, dispersion agent NF0.2g, sodium hydroxide 0.5g, 500ml step 1 subsequently) obtained sepiolite dispersion liquid, 60 DEG C of heating in water bath, stir 4h, obtain pre-vulcanized natural latex, filter with 100 mesh filter screens, after leaving standstill froth breaking, technique salivation film forming routinely, at room temperature dry, then 120 DEG C of baking oven sulfuration 2h are put into, obtained fibrous sepiolite/natural rubber latex compounded latex glued membrane.
After testing, the tensile strength of fibrous sepiolite/natural rubber latex compound cutan that this enforcement is obtained, tear strength, tensile yield and 500% stress at definite elongation are respectively 18.81MPa, 50.32kN/m, 724% and 5.94MPa.
Claims (10)
1. layered silicate/natural rubber latex compound cutan, is characterized in that: it is made primarily of the component of following proportioning:
The natural rubber latex of solid content >=60%, 142 ~ 167 weight parts;
Density is the layered silicate dispersion liquid of 15 ~ 25g/L, 50 ~ 500 parts by volume;
Vulcanizing agent, 1 ~ 5 weight part;
Zinc oxide, 1 ~ 5 weight part;
Promotor, 0.1 ~ 0.5 weight part;
Dispersion agent, 0.1 ~ 0.5 weight part;
In said ratio, when in weight part, the unit of weight is chosen as kg, in parts by volume, the unit of volume is L;
Layered silicate dispersion liquid is prepared by the following method: get the acid solution ultrasonic disperse that layered silicate is placed in concentration >=0.5mol/L, get suspension water repetitive scrubbing to pH close to neutral, the density controlling layered silicate is 15 ~ 25g/L, adjust its pH=7 ~ 9 afterwards, namely obtain the layered silicate dispersion liquid that density is 15 ~ 25g/L.
2. layered silicate according to claim 1/natural rubber latex compound cutan, is characterized in that: the raw material preparing layered silicate/natural rubber latex compound cutan also comprises potassium hydroxide and/or the sodium hydroxide of 0.1 ~ 0.5 weight part.
3. layered silicate according to claim 1/natural rubber latex compound cutan, is characterized in that: the ratio of each component is:
The natural rubber latex of solid content >=60%, 142 ~ 167 weight parts;
Density is the layered silicate dispersion liquid of 15 ~ 25g/L, 100 ~ 500 parts by volume;
Vulcanizing agent, 1 ~ 2 weight part;
Zinc oxide, 1 ~ 2 weight part;
Promotor, 0.1 ~ 0.2 weight part;
Dispersion agent, 0.1 ~ 0.2 weight part.
4. the layered silicate according to any one of claims 1 to 3/natural rubber latex compound cutan, is characterized in that: described vulcanizing agent is stearic acid and/or sulphur.
5. the layered silicate according to any one of claims 1 to 3/natural rubber latex compound cutan, is characterized in that: described promotor being is selected from any one or two or more combination of N-ethyl, N-phenyl zinc dithiocarbamate, zinc diethyldithiocarbamate and N-cyclohexyl-2-benzothiazole sulfonamide.
6. the layered silicate according to any one of claims 1 to 3/natural rubber latex compound cutan, is characterized in that: described dispersion agent is Dispersant MF and/or dispersion agent NF.
7. the layered silicate according to any one of claims 1 to 3/natural rubber latex compound cutan, is characterized in that: described layered silicate is sepiolite and/or attapulgite.
8. the preparation method of layered silicate according to claim 1/natural rubber latex compound cutan, comprises the following steps:
1) the acid solution ultrasonic disperse that layered silicate is placed in concentration >=0.5mol/L is got, get suspension water repetitive scrubbing to pH close to neutral, the density controlling layered silicate is 15 ~ 25g/L, adjusts its pH=7 ~ 9 afterwards, obtains the layered silicate dispersion liquid that density is 15 ~ 25g/L;
2) by the layered silicate dispersion liquid that formula takes the natural rubber latex of solid content >=60%, density is 15 ~ 25g/L, vulcanizing agent, zinc oxide, promotor and dispersion agent, mixing, carries out prevulcanized, obtains prevulcanized latex; Gained prevulcanized latex is technique salivation film forming, afterwards drying, sulfuration routinely, namely obtains layered silicate/natural rubber latex compound cutan.
9. preparation method according to claim 8, is characterized in that: step 1) in, the concentration of described acid solution is 0.5 ~ 2mol/L.
10. preparation method according to claim 8, is characterized in that: step 1) in, described layered silicate is sepiolite and/or attapulgite.
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| CN110734585A (en) * | 2019-10-24 | 2020-01-31 | 江苏清荷材料科技有限公司 | rubber master batch and preparation method thereof, and rubber and preparation method thereof |
| CN113462042A (en) * | 2021-07-26 | 2021-10-01 | 桂林电子科技大学 | Amino modified sepiolite/graphene oxide/natural rubber composite latex and preparation method thereof |
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| CN107266732A (en) * | 2017-07-20 | 2017-10-20 | 桂林紫竹乳胶制品有限公司 | A kind of nano layered silicate/Heveatex medical rubber glove and preparation method thereof |
| CN107602953A (en) * | 2017-10-11 | 2018-01-19 | 岭南师范学院 | A kind of tripoli/Heveatex compound cutan and its preparation method and application |
| CN107602953B (en) * | 2017-10-11 | 2019-11-12 | 岭南师范学院 | A kind of tripoli/Heveatex compound cutan and its preparation method and application |
| CN108641126A (en) * | 2018-04-23 | 2018-10-12 | 龙岩学院 | A kind of preparation method of the supported porous carbon fiber of nano-propolis/Heveatex antimicrobial compound film |
| CN109021329A (en) * | 2018-07-06 | 2018-12-18 | 佛山皖阳生物科技有限公司 | A kind of preparation method of Heveatex composite sponge |
| CN110734585A (en) * | 2019-10-24 | 2020-01-31 | 江苏清荷材料科技有限公司 | rubber master batch and preparation method thereof, and rubber and preparation method thereof |
| CN113462042A (en) * | 2021-07-26 | 2021-10-01 | 桂林电子科技大学 | Amino modified sepiolite/graphene oxide/natural rubber composite latex and preparation method thereof |
| CN118146571A (en) * | 2024-05-11 | 2024-06-07 | 四川大学 | Insulating latex glove and preparation method thereof |
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