CN114106488B - Transparent PVC sealing rubber strip for acrylic pouring and preparation method thereof - Google Patents
Transparent PVC sealing rubber strip for acrylic pouring and preparation method thereof Download PDFInfo
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- CN114106488B CN114106488B CN202111463051.4A CN202111463051A CN114106488B CN 114106488 B CN114106488 B CN 114106488B CN 202111463051 A CN202111463051 A CN 202111463051A CN 114106488 B CN114106488 B CN 114106488B
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/56—Organo-metallic compounds, i.e. organic compounds containing a metal-to-carbon bond
- C08K5/57—Organo-tin compounds
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
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- C08K5/10—Esters; Ether-esters
- C08K5/101—Esters; Ether-esters of monocarboxylic acids
- C08K5/103—Esters; Ether-esters of monocarboxylic acids with polyalcohols
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- C—CHEMISTRY; METALLURGY
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- C08L2201/08—Stabilised against heat, light or radiation or oxydation
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- C08L2201/10—Transparent films; Clear coatings; Transparent materials
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Abstract
The invention discloses a transparent PVC sealing rubber strip for acrylic pouring and a preparation method of the transparent PVC sealing rubber strip, and relates to the technical field of thermoplastic resin in high molecular compounds, wherein the transparent PVC sealing rubber strip comprises the following raw materials in parts by weight: PVC powder: 100 parts of (A); DOP: 48-58 parts; dibutyltin dilaurate: 2-3 parts of a solvent; methyl tin mercaptide: 0.1-0.2 parts; stearic acid: 1-2 parts; PETS: 0.1-0.2 part of transparent PVC sealing rubber strip is obtained, and the sealing property can be still maintained after the transparent PVC sealing rubber strip is soaked in MMA at the temperature of 60 ℃ for 2-15 hours; meanwhile, the transparent PVC sealing rubber strip does not yellow and crack after being heated for 3-4.5h at 120 ℃.
Description
Technical Field
The invention relates to the technical field of thermoplastic resin in high molecular compounds, in particular to a transparent PVC sealing rubber strip for acrylic pouring and a preparation method thereof.
Background
The production mold for pouring acrylic is a cavity formed by PVC sealing rubber strips at the periphery of the middle part of two pieces of flat glass. And (3) after the acrylic prepolymer is poured into the cavity, carrying out water bath polymerization and high-temperature polymerization. And the polymerization process in the acrylic pouring production has very high requirements on the sealing performance of the PVC sealing rubber strip, such as:
1. the waterproof plate needs to be soaked in MMA (acrylic resin) at about 60 ℃ for about 2-18 h, the water tightness in a water bath is kept, and the duration time is related to the thickness of the plate;
2. after being soaked, the raw materials need to be baked at a high temperature of 120 ℃, and appearance change, color change, cracking and the like do not occur within 3-4.5 h;
3. does not affect the polymerization speed (the stabilizer containing sulfur can slow down the reaction speed);
4. the material is environment-friendly.
The existing PVC sealing rubber strip is generally prepared by adopting a zinc-barium stabilizer, and the obtained product has the defects of insufficient heat resistance, easy cracking and color change, poor transparency and influence on the appearance of the product. The PVC sealing rubber strip with the diameter of less than 2.0mm has poor sealing performance, and quality problems such as poor sealing and the like are easy to generate.
If the application number of the national intellectual property office is "CN 201910479339.7" published in 2019, 8, month and 2, the name of the application is "an environment-friendly PVC sealing strip and a preparation method thereof", the scheme adopts the following steps: a calcium zinc stabilizer; and for example, the application number of the national intellectual property office is 'CN201710596130. X' published in 2019, 6, 18, entitled 'environment-friendly high-resilience PVC/NBR/BR elastomer sealing strip and preparation method thereof', and the calcium-zinc composite stabilizer is also adopted. The PVC sealing strip prepared by the method can not meet the requirement of actual production, and the PVC sealing strip is soaked in a methyl methacrylate environment at 60 ℃ for 3-15 h (the time for plates with different thicknesses is different, for example, 3h for 2mm and 15h for 20 mm), and then is soaked in a high-temperature environment at 120 ℃ for 3-4.5h, so that the conditions of high water wrinkle rate of the plates, cracking and breaking of water inlet waste plates or rubber strips and the like occur.
Disclosure of Invention
The invention aims to provide a transparent PVC sealing rubber strip for acrylic pouring and a preparation method thereof, which solve the problems of poor heat resistance, easy cracking, easy color change and poor transparency of the conventional PVC sealing rubber strip, and the obtained transparent PVC sealing rubber strip still keeps the sealing property after being soaked in MMA at 60 ℃ for 2-15 hours; meanwhile, the transparent PVC sealing rubber strip does not yellow and crack after being heated for 3-4.5h at 120 ℃.
The invention is realized by the following technical scheme:
the utility model provides a pour transparent PVC joint strip for ya keli, the raw materials constitute and include with the part by mass:
100 parts of PVC powder;
48-58 parts of DOP;
2-3 parts of dibutyltin dilaurate;
0.1-0.2 part of methyl tin mercaptide;
1-2 parts of stearic acid;
0.1-0.2 part of PETS.
Further, the particle size of the PVC powder is not less than 80 meshes.
The preparation method of the transparent PVC sealing rubber strip for pouring acrylic comprises the following steps:
a. material mixing and plasticizing:
weighing the components according to the mass part ratio, firstly adding PVC powder into a mixer for stirring, then adding DOP, dibutyltin dilaurate, methyltin mercaptide, stearic acid and PETS for mixing, heating the materials, and stopping stirring when the temperature of the materials in the mixer reaches 70 +/-5 ℃ for later use;
b. extruding:
and (c) starting the screw extruder, keeping the temperature after preheating to a preset temperature, starting a screw of the screw extruder, adding the material plasticized in the step a into the screw extruder, extruding the material from a die head of the screw extruder, cooling and drawing to obtain the transparent PVC sealing rubber strip.
Further, in the step b, the temperature of the feeding zone of the screw extruder is 155-.
Further, the screw rotating speed of the screw extruder is 25-35 rmp.
Further, in the step b, a tractor is adopted to draw the transparent PVC sealing rubber strip, and the running speed of the tractor is 0.2-0.5 m/s.
Further, in the step b, the primary rubber strip to be formed is cooled by a water tank, and is sent to a tractor for traction treatment after being cooled to room temperature.
Further, the screw extruder is a single screw extruder.
Further, in the step b, the screw extruder is preheated to a preset temperature and then is kept warm for 1 hour.
Compared with the prior art, the invention has the following advantages and beneficial effects:
the PVC sealing rubber strip prepared by adopting the raw material proportion in the scheme has good transparency, and can show good sealing performance after being soaked in MMA (acrylic resin) at about 60 ℃ for a long time, for example, the PVC sealing rubber strip with the thickness of 2mm is soaked in MMA (acrylic resin) for about 3 hours, and shows good sealing performance to water, for example, the PVC sealing rubber strip with the thickness of 20mm is soaked in MMA (acrylic resin) for 15 hours, and then shows good sealing performance to water; meanwhile, the PVC sealing rubber strip is baked at a high temperature of 120 ℃ after being soaked, appearance change does not occur within 3-4.5 hours, the duration time is related to the thickness of the PVC sealing rubber strip, phenomena such as color change and cracking do not occur, and the use requirement is met.
In the invention, a soap stabilizer of zinc barium is cancelled, an organic tin stabilizer is adopted to solve the problems of heat resistance and transparency, and an external lubricant adopts PETS to ensure lubricity without influencing the transparency of the rubber strip, so that the finally obtained PVC sealing rubber strip is colorless and transparent and is beautiful.
In the invention, the PVC sealing rubber strip obtained by adopting the technical scheme has no influence on the polymerization speed of PMMA.
Drawings
FIG. 1 is a diagram of a clear PVC sealant strip obtained from group 2 of example 1.
FIG. 2 is a graph showing yellowing and cracking of a 20mm PVC sealing rubber strip in example 2 after baking for 6 hours.
Detailed Description
The present invention will be described in further detail with reference to examples, but the embodiments of the present invention are not limited thereto.
Example 1:
the transparent PVC sealing rubber strip for acrylic pouring comprises PVC powder, DOP (dioctyl phthalate), dibutyltin dilaurate, methyltin mercaptide, stearic acid and PETS (pentaerythritol stearate), and is prepared by weighing the raw materials according to the raw material proportion of each group in the table 1.
TABLE 1
And then preparing the PVC sealing rubber strip from the raw materials according to the following preparation method, wherein the preparation method comprises the following steps:
a. adding PVC powder into a mixer for stirring, adding DOP, dibutyltin dilaurate, methyltin mercaptide, stearic acid and PETS for mixing, adding the materials to 65 ℃, and stopping stirring for later use;
b. and (c) starting the screw extruder, starting a screw of the screw extruder, adding the material plasticized in the step a into the screw extruder, extruding the material from a die head of the screw extruder, cooling and drawing to obtain the PVC sealing rubber strip with the thickness of 4 +/-0.2 mm.
And then testing the PVC sealing rubber strips obtained by each group, wherein the testing method comprises the following steps: and (5) respectively trying 1000 PVC sealing rubber strips in each group on a production line to produce a plate with the thickness of 3.2 mm. And then placing the die in a water tank at 60-63 ℃ for reaction for 3h, checking the hardness of the plate by a needle punching method, baking the plate at 120 ℃ for 3h after the hardness is reached, and observing and counting the quality condition of the finished product. The test results are shown in Table 2.
TABLE 2
The PVC sealing rubber strip obtained in the group 2 is shown in a figure 1, and tables 1 and 2 show that the sealing property and the high-temperature cracking resistance of the rubber strip produced by the formula meet the production requirements.
Example 2
A preparation method of a transparent PVC sealing rubber strip for acrylic pouring belongs to the technical field of thermoplastic resin in high molecular compounds, and the raw materials are taken according to the raw material proportion of the group 2 in the embodiment 1, and the PVC sealing rubber strips with the thicknesses of 2mm, 5mm, 8mm, 15mm and 20mm are prepared by the following method.
The preparation method comprises the following steps:
a. material mixing and plasticizing:
weighing the components according to the mass part ratio, wherein the particle size of the PVC powder is 80 meshes, adding the PVC powder into a mixer for stirring, adding DOP, dibutyltin dilaurate, methyltin mercaptide, stearic acid and PETS for mixing, heating the materials, and stopping stirring when the temperature of the materials in the mixer reaches 70 +/-5 ℃ for later use;
b. extruding:
and (c) starting the screw extruder, preserving heat for 1h after preheating to a preset temperature, starting a screw of the screw extruder, adding the material plasticized in the step a into the screw extruder, extruding the material from die heads of the screw extruder in various specifications, cooling and drawing to obtain the transparent PVC sealing rubber strip.
And respectively testing the PVC sealing rubber strips of various specifications. The test method comprises the following steps:
and (5) trial 100 PVC sealing rubber strips of each group on a production line to produce the plate with corresponding thickness. Then the mould is placed in a water pool with the temperature of 60-63 ℃ for reaction for 3-16h, and the hardness of the plate is checked by a needle punching method. And then baking the sealing rubber strips with the longest soaking time and the hardness requirement at the high temperature of 120 ℃, observing and counting the quality condition of the finished product, wherein the test result is shown in table 4 (in table 4, the water wrinkle rate of the finally obtained sealing rubber strips is less than or equal to 1%, the water inlet rate is 0, no crack exists, the sealing rubber strips are regarded as qualified, and otherwise, the sealing rubber strips are regarded as unqualified).
TABLE 3
From the above, it can be seen that 2mm of the sealing rubber strips of pvc prepared by the formulation and method of the present embodiment, after being soaked in MMA (acrylic resin) for 3 hours, showed good sealing performance against water; meanwhile, the soaked product is baked at a high temperature of 120 ℃, and appearance change does not occur within 2.5 hours; 5mm of PVC sealing rubber strip shows good sealing performance to water after being soaked in MMA for 4 hours; meanwhile, after being soaked, the fabric needs to be baked at a high temperature of 120 ℃, and appearance change does not occur within 3 hours; 8mmPVC sealing rubber strips are soaked in MMA for 6 hours, and the sealing performance to water is good; meanwhile, the soaked product is baked at a high temperature of 120 ℃, and the appearance change is avoided within 3.5 hours; 15mm of PVC sealing rubber strip is soaked in MMA for 10 hours, and the sealing performance to water is good; meanwhile, the soaked product is baked at a high temperature of 120 ℃, and the appearance of the product is not changed within 4 hours; 20mm of PVC sealing rubber strip shows good sealing performance to water after being soaked in MMA for 18 h; meanwhile, the soaked product is baked at a high temperature of 120 ℃, and the appearance of the product is not changed within 4.5 hours.
FIG. 2 is a graph showing that the sealing rubber strip of 20mm PVC in this example shows good water tightness after being soaked in MMA for 18 h; and after the glue strip is baked for 6 hours at the high temperature of 120 ℃, the glue strip is cracked and yellowed.
As can be seen from the above tests, the duration time in the MMA environment at 60 ℃ and the high-temperature (120 ℃) environment is also related to the thickness of the PVC sealing rubber strip, and the PVC sealing rubber strip with the proper thickness can be selected according to the production requirements.
Example 3
A preparation method of a transparent PVC sealing rubber strip for acrylic pouring belongs to the technical field of thermoplastic resin in high molecular compounds, and comprises the following steps of weighing PVC powder, DOP, dibutyltin dilaurate, methyl tin mercaptide, stearic acid and PETS according to the raw material ratio of the group 3 in the embodiment 1:
a. material mixing and plasticizing:
weighing the components according to the mass part ratio, firstly adding PVC powder into a mixer for stirring, then adding DOP, dibutyltin dilaurate, methyltin mercaptide, stearic acid and PETS for mixing, heating the materials, and stopping stirring when the temperature of the materials in the mixer reaches 70 +/-5 ℃ for later use;
b. extruding:
and (c) starting the screw extruder, preserving heat for 1h after preheating to a preset temperature, starting a screw of the screw extruder, adding the material plasticized in the step a into the screw extruder, extruding the material from a die head of the screw extruder, cooling and drawing to obtain the transparent PVC sealing rubber strip.
In the step b, the temperature of each zone of the screw extruder is shown in the following table 5, the screw rotating speed of the screw extruder is 25rmp, and the running speed of a tractor is 0.5-0.8m/s, so that 2mm of PVC sealing rubber strips are prepared. The PVC sealing rubber strips of each group were tested by the test method of example 2, and the results are shown in table 6.
TABLE 4
TABLE 5
According to the test results, in the step b, the temperature change of each area of the screw extruder has little influence on the finished product of the PVC sealing rubber strip within the temperature range of the scheme. According to actual use, the temperature of each zone of the screw extruder has certain influence on the performance of the PVC sealing rubber strip, the higher the temperature is, the higher the plasticizing degree of the PVC is, the better the fluidity of the melt is, the higher the extrusion speed is, but the requirement on the stabilizer is higher.
In actual production, the diameter of the rubber strip is adjusted by traction, for example, the diameter of the PVC sealing rubber strip with the diameter of 2.0mm is about 3.2mm, the PVC sealing rubber strip with the diameter of 3.5mm can be made, the PVC sealing rubber strip with the diameter of 2.0mm can be made, and the PVC sealing rubber strips with two specifications can be made by adjusting the traction speed. In addition, the screw rotating speed of the screw extruder is controlled to be 25-35rmp, and the production operation is stable.
Comparative example 1
In this embodiment, a 2mm universal PVC sealing strip for casting acrylic plate PVC seal is purchased in the market, and the test method is: 50 pieces of PVC sealing rubber strips of each group are tried on a production line, and a plate with the thickness of 2mm is produced. Then placing the die in a 60-63 ℃ water pool (containing MMA) for reaction for 3h, checking the hardness of the plate by a needle punching method, baking the plate at the high temperature of 120 ℃ for 3h after the hardness is reached, observing and counting the quality condition of the finished product.
The test results are: the adhesive tape has serious yellowing (accounting for 6 percent) in appearance, cracks appear in 2 percent, water enters in 2 percent, the water wrinkle rate of part of the adhesive tape is as high as 10 percent, and the requirement of the production environment cannot be met.
Comparative example 2
In the comparative example, the raw materials are weighed according to the following proportion, and the PVC sealing rubber strip with the thickness of 2mm is prepared by the same preparation method as in the example.
100 parts of PVC powder;
50 parts of DOP;
2.5 parts of dibutyltin dilaurate;
1 part of zinc stearate;
1 part of barium stearate;
stearic acid 1 part
0.2 part of PETS.
The obtained adhesive tape was tested according to the test method of the PVC sealing adhesive tape in example 1 (the number of samples was 50), and the test results were: the adhesive tape is opaque, the adhesive tape is soaked in a MMA-containing water tank at the temperature of 60-63 ℃ for 2 hours, then the adhesive tape is placed in a high-temperature environment at the temperature of 120 ℃ for baking for 3 hours, and the inspection shows that the water wrinkle rate in the batch of adhesive tape reaches 8%, the water inlet rate reaches 10%, the cracking rate accounts for 100%, and the production requirement is not met.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and all simple modifications and equivalent variations of the above embodiments according to the technical spirit of the present invention are included in the scope of the present invention.
Claims (9)
1. The utility model provides a pour transparent PVC joint strip for ya keli which characterized in that, the raw materials constitute and include with the part by mass:
100 parts of PVC powder;
48-58 parts of DOP;
2-3 parts of dibutyltin dilaurate;
0.1-0.2 part of methyl tin mercaptide;
1-2 parts of stearic acid;
0.1-0.2 part of pentaerythritol stearate.
2. The transparent PVC sealing rubber strip for acrylic pouring according to claim 1, wherein: the particle size of the PVC powder is not less than 80 meshes.
3. The preparation method of the transparent PVC sealing rubber strip for pouring acrylic according to claim 1, characterized by comprising the following steps:
a. material mixing and plasticizing:
weighing the components according to the mass part ratio, firstly adding PVC powder into a mixer for stirring, then adding DOP, dibutyltin dilaurate, methyltin mercaptide, stearic acid and pentaerythritol stearate for mixing, heating the materials, and stopping stirring when the temperature of the materials in the mixer reaches 70 +/-5 ℃ for later use;
b. extruding:
and (c) starting the screw extruder, keeping the temperature after preheating to a preset temperature, starting a screw of the screw extruder, adding the material plasticized in the step a into the screw extruder, extruding the material from a die head of the screw extruder, cooling and drawing to obtain the transparent PVC sealing rubber strip.
4. The preparation method of the transparent PVC sealing rubber strip for acrylic pouring according to claim 3, wherein the method comprises the following steps: in the step b, the temperature of the feeding zone of the screw extruder is 155-.
5. The preparation method of the transparent PVC sealing rubber strip for acrylic pouring according to claim 4, wherein the method comprises the following steps: the screw rotating speed of the screw extruder is 25-35 rmp.
6. The preparation method of the transparent PVC sealing rubber strip for acrylic pouring according to claim 5, wherein the method comprises the following steps: and in the step b, a tractor is adopted to draw the transparent PVC sealing rubber strip, and the running speed of the tractor is 0.2-0.8 m/s.
7. The preparation method of the transparent PVC sealing rubber strip for pouring acrylic according to any one of claims 3 to 6, wherein the method comprises the following steps: and in the step b, cooling the primary rubber strip to be formed through a water tank, cooling to room temperature, and then conveying to a traction machine for traction treatment.
8. The preparation method of the transparent PVC sealing rubber strip for acrylic pouring according to claim 7, wherein the method comprises the following steps: the screw extruder is a single screw extruder.
9. The preparation method of the transparent PVC sealing rubber strip for acrylic pouring according to claim 1, wherein the method comprises the following steps: in the step b, the screw extruder is preheated to a preset temperature and then is insulated for 1 to 1.5 hours.
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