A vulcanization bag for high-elasticity low-density ultra-light latex products, a preparation method and application thereof

Abstract

The application provides a vulcanization package for high-elasticity low-density ultra-light latex products, a preparation method and application, and relates to pure natural latex products. The vulcanization package comprises a foam stabilizer nano-bentonite, potassium carboxymethyl cellulose, glass microbeads, a zinc oxide dispersion and a diphenyl guanidine dispersion. The preparation method has simple steps. The nano-bentonite, the diphenyl guanidine dispersion and the glass microbeads are stirred and mixed under the condition of 25 DEG C to obtain a mixture A. The thickening agent potassium carboxymethyl cellulose is added into the mixture A, and then the zinc oxide dispersion is added to obtain a vulcanization package mixture B (vulcanization package). After the mixture B (vulcanization package) is uniformly stirred, the mixed glue solution is immediately transferred to a foaming machine for foaming, so as to prevent the glue solution from becoming thick due to long stirring and affecting foaming, and to prepare a high-elasticity low-density ultra-light mass pure natural latex product with uniform and delicate structure.

Description

Technical Field

[0001] This invention relates to the field of latex product technology, specifically to a vulcanizing package, preparation method, and application for high-elasticity, low-density, ultra-lightweight latex products. Technical Background

[0002] As people's living standards continue to improve, their requirements for sleep quality are getting higher and higher. Different groups of people have different needs. The firmness of traditional latex mattresses is generally 75 kg / m². 3 -85kg / m 3 The current density is no longer suitable for people who pursue ultra-high elasticity. Ultra-high elastic latex products produced to meet the needs of this group often achieve ultra-elasticity by reducing density. However, reducing density inevitably leads to a decline in other properties of latex products.

[0003] Under normal circumstances, the density of latex products can be reduced to 65 kg / m³. 3 Its resilience rate is only about 50%, and it cannot be produced continuously. The reason is that when the density of latex products is reduced, the gaps between the foam cells in the latex products will inevitably become larger, and the larger bubbles are more likely to break during foaming, resulting in uneven and rough structure of the latex products, which seriously affects the resilience and feel of the latex products.

[0004] In existing technologies, the process of adding components in a dispersed manner is cumbersome, and there is also the problem of under-addition or omission. Summary of the Invention

[0005] To address the above problems, this invention provides a vulcanization package, preparation method, and application for high-elasticity, low-density, ultra-lightweight latex products.

[0006] The technical solution of the present invention is: a vulcanizing package for high-elasticity, low-density, ultra-lightweight latex products, comprising: foam stabilizer nano-bentonite, potassium carboxymethyl cellulose, glass microspheres, zinc oxide dispersion and diphenylguanidine dispersion.

[0007] The particle size of the nano-bentonite is 30-50 nm; The solution contains 2%-5% potassium carboxymethyl cellulose. The glass microspheres have a particle size of 20-35 mm; The zinc oxide dispersion has a mass fraction of 35%-50%; The mass fraction of the diphenylguanidine dispersion is 45%-65%.

[0008] The preparation of a vulcanizing package for high-elasticity, low-density, ultra-lightweight latex products includes the following steps: S1. Mix nano-bentonite, diphenylguanidine dispersion and glass microspheres at 25°C to obtain mixture A; S2. Add the thickener potassium carboxymethyl cellulose to mixture A, and then add zinc oxide dispersion to obtain mixture B, forming a vulcanized package.

[0009] An application of a vulcanizing package for high-elasticity, low-density, ultra-lightweight latex products includes the following steps: S1. Add potassium pyrophosphate, potassium oleate, potassium ricinoleate, and sulfur dispersion to pure natural latex solution, stir and mature at 25°C to obtain mixed latex solution; S2. After the vulcanizing package is stirred evenly, the mixed adhesive solution is immediately transferred to the foaming machine for foaming. Sodium fluorosilicate dispersion is injected during the foaming process. After the foamed sheet is heated and shaped by infrared and hot air, it is put into the steam oven for vulcanization. S3. Simply wash and dry the semi-finished pure natural latex products.

[0010] In this invention, the vulcanizing bag can be prepared in advance and added directly before foaming, and the addition ratio of each component can be effectively controlled, improving accuracy and reliability. Detailed Implementation

[0011] The present invention will be described in detail below with reference to the embodiments.

[0012] A vulcanizing package for high-elasticity, low-density, ultra-lightweight latex products includes: foam stabilizer nano-bentonite, potassium carboxymethyl cellulose, glass microspheres, zinc oxide dispersion, and diphenylguanidine dispersion.

[0013] The particle size of the nano-bentonite is 30-50 nm; The solution contains 2%-5% potassium carboxymethyl cellulose. The glass microspheres have a particle size of 20-35 mm; The zinc oxide dispersion has a mass fraction of 35%-50%; The mass fraction of the diphenylguanidine dispersion is 45%-65%.

[0014] The present invention proposes the addition of nano-bentonite as a foam stabilizer, which forms a single layer of coverage on the surface of the foam liquid film during foaming, effectively preventing leakage, improving the stability of the foam, avoiding the phenomenon of uneven and rough latex product structure caused by the bursting of bubbles, and improving the elasticity of latex products.

[0015] Nano-bentonite: In addition to the above functions, it can make natural latex flow more easily and form more easily during the foaming process, improve production efficiency, reduce the shrinkage rate of finished products, effectively increase the volume of finished products, and reduce density.

[0016] Glass microspheres, with their low density, can increase the volume of latex sponge products. After molding, they reduce the density of the latex sponge products while maintaining their volume, thus lowering the density of the latex products. Furthermore, glass microspheres can enhance the tensile and compressive strength of latex sponge products, thereby improving their mechanical properties.

[0017] Diphenylguanidine dispersion: Improves the hardness and strength of latex sponge products, makes the finished product more stable, reduces shrinkage, and reduces density.

[0018] When the above three are mixed, mixture A is obtained. It does not easily settle after being left for a long time. It can be added directly without stirring, which greatly improves work efficiency and reduces workload.

[0019] Potassium carboxymethyl cellulose has better hygroscopicity than sodium carboxymethyl cellulose, which can effectively reduce the drying time of the finished product. In addition, the use of potassium carboxymethyl cellulose can reduce the viscosity of the adhesive during the foaming process, making it easier to foam and allowing for longer continuous production time.

[0020] The vulcanizing bag contains zinc oxide. If added during the mixing process and pre-vulcanized with other ingredients, the viscosity of the natural rubber mixture will increase significantly, affecting foaming efficiency and increasing foaming difficulty. Therefore, it should be added before foaming, stirred evenly, and then foamed directly to avoid the above problems.

[0021] The manufacturing method proposed in this invention is simple. Mixture A is added after 15-24 hours of curing, followed by the addition of mixture B (vulcanizing package). After stirring for 15-30 minutes, foaming is immediately initiated to prevent the latex from thickening due to prolonged stirring and curing, which would affect foaming. This process yields a pure natural latex product with a uniform and delicate structure, high elasticity, low density, and ultralight weight.

[0022] In practical applications Example 1 The preparation method of the present invention includes the following steps: 1) Add 2 parts potassium pyrophosphate, 5 parts potassium oleate, 4 parts potassium castor oil, and 1 part sulfur dispersion to 100 parts pure natural latex solution, and stir and mature at 25°C for 15 hours. 2) Mix 4 parts of nano-bentonite, 0.3 parts of diphenylguanidine dispersion and glass microspheres with a particle size of 25 mm at 25°C to obtain mixture A; 3) Add 4 parts of thickener potassium carboxymethyl cellulose to mixture A, and then add 3 parts of zinc oxide dispersion to obtain mixture B (vulcanized package). 4) After mixing mixture B (vulcanizing package) evenly, immediately transfer the mixed adhesive liquid to the foaming machine for foaming. During the foaming process, inject 3 parts of sodium fluorosilicate dispersion. After the foamed sheet is heated and shaped by infrared and hot air, it enters the steam oven for vulcanization at a temperature of 90℃ for 15 minutes. 5) Simply wash and dry the semi-finished pure natural latex products.

[0023] Example 2 The preparation method of the present invention includes the following steps: 1) Add 7 parts potassium pyrophosphate, 9 parts potassium oleate, 8 parts potassium castor oil, and 6 parts sulfur dispersion to 105 parts pure natural latex solution, and stir and mature at 25°C for 24 hours. 2) Mix 8 parts of nano-bentonite, 3.5 parts of diphenylguanidine dispersion and glass microspheres with a particle size of 30 mm at 25°C to obtain mixture A; 3) Add 6 parts of thickener potassium carboxymethyl cellulose to mixture A, and then add 6 parts of zinc oxide dispersion to obtain mixture B (vulcanized package). 4) After mixing mixture B (vulcanizing package) evenly, immediately transfer the mixed adhesive liquid to the foaming machine for foaming. During the foaming process, inject 6 parts of sodium fluorosilicate dispersion. After the foamed sheet is heated and shaped by infrared and hot air, it is put into the steam oven for vulcanization at a temperature of 110℃ for a vulcanization time of 35 minutes. 5) Simply wash and dry the semi-finished pure natural latex products.

[0024] Example 3 The preparation method of the present invention includes the following steps: 1) Add 5 parts potassium pyrophosphate, 7 parts potassium oleate, 6 parts potassium castor oil, and 3 parts sulfur dispersion to 100 parts pure natural latex solution, and stir and mature at 25°C for 20 hours. 2) Mix 6 parts of nano-bentonite, 2 parts of diphenylguanidine dispersion and glass microspheres with a particle size of 35 mm at 25°C to obtain mixture A; 3) Add 5 parts of thickener potassium carboxymethyl cellulose to mixture A, and then add 5 parts of zinc oxide dispersion to obtain mixture B (vulcanized package). 4) After mixing mixture B (vulcanizing package) evenly, immediately transfer the mixed adhesive liquid to the foaming machine for foaming. During the foaming process, inject 4 parts of sodium fluorosilicate dispersion. After the foamed sheet is heated and shaped by infrared and hot air, it is put into the steam oven for vulcanization at a temperature of 100℃ for 25 minutes. 5) Simply wash and dry the semi-finished pure natural latex products.

[0025] The performance of the natural latex sheets prepared in the above embodiments was tested, and Table 1 shows the test data of the embodiments.

[0026] Table 1 Performance test data in each embodiment Testing items Latex sheets in existing technology Example 1 Example 2 Example 3 Height (cm) 5.1 5.1 5.1 5.1 <![CDATA[Density kg / m 3 > 75.15 63.59 62.74 61.35 Hardness (40%) N 90.67 101 102 103 Tensile strength kPa 43.26 90.11 91.34 92.01 Elongation at break % 310.22 306.54 307.16 306.73 Compression permanent deformation % 10.2 7.11 7.24 7.21 Rebound rate % 51.43 76.54 75.88 77.69 As shown in Table 1, the product with added vulcanizing bag has better density and resilience than the 5cm latex sheet produced by existing technology, indicating that the vulcanizing bag can indeed improve product performance.

[0027] The foam stabilizer nano-bentonite proposed in this invention is added before foaming. During foaming, it forms a single layer of coverage on the surface of the foam liquid film. Then, glass microspheres are added. The glass microspheres have a low density, which can increase the volume of the latex product. After molding, the density of the latex product decreases, but its volume remains unchanged, thereby reducing the density of the latex product and improving its physical properties.

Claims

1. A vulcanizing package for high-elasticity, low-density, ultralight latex products, characterized in that, include: Foam stabilizers include nano-bentonite, potassium carboxymethyl cellulose, glass microspheres, zinc oxide dispersion, and diphenylguanidine dispersion.

2. The vulcanizing package for high-elasticity, low-density, ultra-lightweight latex products according to claim 1, characterized in that, The particle size of the nano-bentonite is 30-50 nm.

3. A vulcanizing package for high-elasticity, low-density, ultralight latex products according to claim 1, characterized in that, The solution contains 2%-5% potassium carboxymethyl cellulose.

4. A vulcanizing package for high-elasticity, low-density, ultra-lightweight latex products according to claim 1, characterized in that, The glass microspheres have a particle size of 20-35 mm.

5. A vulcanizing package for high-elasticity, low-density, ultra-lightweight latex products according to claim 1, characterized in that, The zinc oxide dispersion has a mass fraction of 35%-50%.

6. A vulcanizing package for high-elasticity, low-density, ultralight latex products according to claim 1, characterized in that, The mass fraction of the diphenylguanidine dispersion is 45%-65%.

7. A vulcanizing package for high-elasticity, low-density, ultralight latex products, characterized in that, Includes the following steps: S1. Mix nano-bentonite, diphenylguanidine dispersion and glass microspheres at 25°C to obtain mixture A; S2. Add the thickener potassium carboxymethyl cellulose to mixture A, and then add zinc oxide dispersion to obtain mixture B, forming a vulcanized package.

8. An application of a vulcanizing package for high-elasticity, low-density, ultralight latex products, characterized in that, Includes the following steps: S1. Add potassium pyrophosphate, potassium oleate, potassium ricinoleate, and sulfur dispersion to pure natural latex solution, stir and mature at 25°C to obtain mixed latex solution; S2. After the vulcanizing package is stirred evenly, the mixed adhesive solution is immediately transferred to the foaming machine for foaming. Sodium fluorosilicate dispersion is injected during the foaming process. After the foamed sheet is heated and shaped by infrared and hot air, it is put into the steam oven for vulcanization. S3. Simply wash and dry the semi-finished pure natural latex products.