CN113603851A - Double-hardness foam pad and preparation method thereof - Google Patents
Double-hardness foam pad and preparation method thereof Download PDFInfo
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- CN113603851A CN113603851A CN202110928725.7A CN202110928725A CN113603851A CN 113603851 A CN113603851 A CN 113603851A CN 202110928725 A CN202110928725 A CN 202110928725A CN 113603851 A CN113603851 A CN 113603851A
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- 239000006260 foam Substances 0.000 title claims abstract description 46
- 238000002360 preparation method Methods 0.000 title claims abstract description 14
- 239000002994 raw material Substances 0.000 claims abstract description 37
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 28
- 229920005862 polyol Polymers 0.000 claims abstract description 26
- 150000003077 polyols Chemical class 0.000 claims abstract description 26
- 239000003054 catalyst Substances 0.000 claims abstract description 18
- 229920000742 Cotton Polymers 0.000 claims abstract description 17
- 239000004721 Polyphenylene oxide Substances 0.000 claims abstract description 15
- 229920000570 polyether Polymers 0.000 claims abstract description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 14
- 229920000642 polymer Polymers 0.000 claims abstract description 13
- UPMLOUAZCHDJJD-UHFFFAOYSA-N 4,4'-Diphenylmethane Diisocyanate Chemical compound C1=CC(N=C=O)=CC=C1CC1=CC=C(N=C=O)C=C1 UPMLOUAZCHDJJD-UHFFFAOYSA-N 0.000 claims abstract description 12
- 238000004519 manufacturing process Methods 0.000 claims abstract description 5
- 238000003756 stirring Methods 0.000 claims description 27
- 239000000463 material Substances 0.000 claims description 21
- 238000005507 spraying Methods 0.000 claims description 20
- 238000002156 mixing Methods 0.000 claims description 16
- 239000011259 mixed solution Substances 0.000 claims description 14
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical group N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 12
- 229910021529 ammonia Inorganic materials 0.000 claims description 6
- 239000007788 liquid Substances 0.000 claims description 6
- 229920002545 silicone oil Polymers 0.000 claims description 6
- 238000000465 moulding Methods 0.000 claims description 5
- 239000000853 adhesive Substances 0.000 claims description 2
- 230000001070 adhesive effect Effects 0.000 claims description 2
- 239000006082 mold release agent Substances 0.000 claims description 2
- 238000000926 separation method Methods 0.000 claims description 2
- 230000009977 dual effect Effects 0.000 claims 5
- 239000000203 mixture Substances 0.000 abstract 1
- 238000012360 testing method Methods 0.000 description 20
- 230000006835 compression Effects 0.000 description 16
- 238000007906 compression Methods 0.000 description 16
- 238000000034 method Methods 0.000 description 12
- 239000011324 bead Substances 0.000 description 6
- 238000007373 indentation Methods 0.000 description 6
- 238000007541 indentation hardness test Methods 0.000 description 4
- 239000002861 polymer material Substances 0.000 description 4
- 238000003825 pressing Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 239000011148 porous material Substances 0.000 description 3
- 239000012257 stirred material Substances 0.000 description 3
- 230000007704 transition Effects 0.000 description 3
- 210000001217 buttock Anatomy 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 239000013013 elastic material Substances 0.000 description 2
- 238000009661 fatigue test Methods 0.000 description 2
- 238000007542 hardness measurement Methods 0.000 description 2
- 210000002414 leg Anatomy 0.000 description 2
- 239000012229 microporous material Substances 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000013329 compounding Methods 0.000 description 1
- 125000005442 diisocyanate group Chemical group 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 210000003205 muscle Anatomy 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/40—High-molecular-weight compounds
- C08G18/4009—Two or more macromolecular compounds not provided for in one single group of groups C08G18/42 - C08G18/64
- C08G18/4072—Mixtures of compounds of group C08G18/63 with other macromolecular compounds
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/40—High-molecular-weight compounds
- C08G18/48—Polyethers
- C08G18/4829—Polyethers containing at least three hydroxy groups
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/40—High-molecular-weight compounds
- C08G18/63—Block or graft polymers obtained by polymerising compounds having carbon-to-carbon double bonds on to polymers
- C08G18/632—Block or graft polymers obtained by polymerising compounds having carbon-to-carbon double bonds on to polymers onto polyethers
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G2110/00—Foam properties
- C08G2110/0083—Foam properties prepared using water as the sole blowing agent
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- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Polyurethanes Or Polyureas (AREA)
Abstract
The invention discloses a double-hardness foam cotton pad and a preparation method thereof, wherein the foam cotton pad in a softness area comprises the following components: 44-54 parts of polyether polyol 330N, 306-16 parts of polyether polyol H, 0.1 part of catalyst, 1 part of pore-forming agent, 0.1 part of release agent and 0.5-2 parts of water; the composition of the foam pad A in the hardness area is as follows: 30-40 parts of polyether polyol 330N, 0-30 parts of polymer polyol H3020, 0.1 part of a catalyst, 1 part of a pore-forming agent, 0.1 part of a release agent, 0.5-2 parts of water, and 40 parts of diphenylmethane diisocyanate as a component B. The preparation method comprises 1) preparing raw materials; 2) preheating a mould; 3) performing plasticizing reaction; 4) and (5) plasticizing and post-treating. The seat cushion provided by the invention has the advantages of reasonable formula, short forming time and high production efficiency, two areas with different hardness are integrally formed on the seat cushion, the sitting comfort level is effectively improved, and meanwhile, the elasticity of the seat cushion is ensured under the condition that the hardness of the hip area is improved.
Description
Technical Field
The invention relates to a foam pad and a preparation process thereof, in particular to a double-hardness foam pad and a preparation method thereof.
Background
With the popularization of healthy study and healthy work, more and more chairs develop towards the direction of meeting the human engineering and improving the comfort of users. Traditional chair often adopts the mode of bubble cotton parcel seat support, promotes the comfort level of seat, though this scheme has promoted the comfort to a certain extent, has reduced the fatigue degree, nevertheless because the bubble is cotton often is a compounding integrated into one piece, therefore the bubble is cotton often only a hardness, is difficult to get between laminating human body curve and effective support human body and gives up.
Generally speaking, the hip position usually requires the foam to have higher hardness so as to support the human body better, and the sunken deformation of the hip position is too large, which affects the sitting comfort level to a certain extent; the shank position often requires to steep cotton and have relative lower hardness to make the seat more conform to human curve, the seat cushion generally by the shank to the buttock slight downward sloping, if adopt the cotton of the bubble of higher hardness, the cotton will form the extrusion to shank muscle of bubble, cause uncomfortable sense.
At present, although the related double-density foam processes have been developed in technologies such as okamuran and south wave in japan, the following problems exist, one of which is that these foam processes are mainly applied to the fields of automobile seats and the like, and the applicability to seat cushions of seats in daily life and offices is not strong; secondly, these foam processes usually adopt the upper and lower dual-hardness process, so there is no essential improvement to solve the above technical problems.
Disclosure of Invention
Aiming at the problems in the prior art, the invention aims to provide a double-hardness foam pad and a preparation method thereof.
The invention is realized by the following technical scheme:
a two hardness bubble cotton pad, its characterized in that: the foam pad is provided with a softness area and a hardness area, the softness area and the hardness area are both composed of two reaction raw materials of an A component and a B component,
the component A of the softness area foam cotton pad consists of the following raw materials in parts by weight: 44-54 parts of polyether polyol 330N, 306-16 parts of polymer polyol H, 0.1 part of catalyst, 1 part of pore-forming agent, 0.1 part of release agent and 0.5-2 parts of water, wherein the component B is 40 parts of diphenylmethane diisocyanate;
the component A of the foam pad in the hardness area consists of the following raw materials in parts by weight: 30-40 parts of polyether polyol 330N, 0-30 parts of polymer polyol H3020, 0.1 part of a catalyst, 1 part of a pore-forming agent, 0.1 part of a release agent, 0.5-2 parts of water, and 40 parts of diphenylmethane diisocyanate as a component B.
Further, the component A of the softness area foam pad consists of the following raw materials in parts by weight: 48 parts of polyether polyol 330N, 0.1 part of catalyst, 1 part of pore-forming agent, 0.1 part of release agent, 0.5-2 parts of water and 40 parts of diphenylmethane diisocyanate as a component B;
the component A of the foam cotton pad in the hardness area consists of the following raw materials in parts by weight: the adhesive comprises, by weight, 330N 36 parts of polyether polyol, H3024 parts of polymer polyol, 0.1 part of a catalyst, 1 part of a pore-forming agent, 0.1 part of a mold release agent, 0.5-2 parts of water, and 40 parts of diphenylmethane diisocyanate as a component B.
Further, the catalyst is an ammonia catalyst, and the pore former is a silicone oil pore former.
The invention also provides a preparation method of the double-hardness foam cotton pad, which is characterized by comprising the following steps of: the preparation method comprises the following steps:
1) preparing raw materials: mixing the raw materials of the component A in the softness area according to the formula ratio, stirring for 3-5 hours at normal temperature to obtain a stirring material of the component A in the softness area, and then placing the stirring material of the component A in the softness area into a cavity with the temperature of 24 ℃ and the pressure of 13 MPa; placing the component B raw material into another chamber with the temperature of 22 ℃ and the pressure of 10MPa, atomizing and spraying the component A stirring material and the component B raw material in the softness area under the high pressure respectively, and fully mixing to form a softness area mixed solution;
mixing the raw materials of the component A in the hardness area according to the formula amount, stirring for 3-5 hours at normal temperature to prepare a component A stirring material in the hardness area, and then placing the component A stirring material in the hardness area into a cavity with the temperature of 24 ℃ and the pressure of 13 MPa; placing the raw material of the component B into another chamber with the temperature of 22 ℃ and the pressure of 10MPa, atomizing and spraying the mixed material of the component A and the raw material of the component B in the hardness area under the high pressure respectively, and fully mixing to form mixed liquid of the hardness area;
2) preheating a mould: preheating a mould with a hardness zone cavity and a softness zone cavity, spraying a softness zone mixed solution into the mould softness zone cavity after preheating is finished, and then spraying a hardness zone mixed solution into the mould hardness zone cavity;
3) plasticizing, namely keeping the mold within a preheating temperature range, closing the mold, and plasticizing and molding the mixed solution in the soft area cavity and the hard area cavity under high pressure generated by the mold;
4) and (3) plasticizing post-treatment: and (3) placing the product plasticized and formed in the step 3) for 12 hours at normal temperature and normal pressure to completely finish the plasticizing reaction to obtain the double-hardness foam pad.
Further, in the step 2), the mould is preheated to 45-60 ℃, the spraying time of the mixed liquid in the softness area is 1.4s, and the spraying time of the mixed liquid in the hardness area is 2.4 s.
Further, the plasticizing and molding time in the step 3) is 3-5 min.
Furthermore, a convex edge with the height of 1cm is arranged between the hardness area cavity and the softness area cavity of the die for separation.
The invention has reasonable formula, short forming time and high production efficiency, effectively improves the comfort level of sitting by integrally forming two areas with different hardness at the leg part and the hip part on the seat cushion, simultaneously can ensure the elasticity of the areas under the condition of improving the hardness of the hip part area by adopting the formula and the preparation method, ensures that the forming of the areas with different hardness is better separated in the early reaction stage and forms a good transition surface in the later reaction stage by the convex edge arranged in the mould.
Drawings
FIG. 1 is a schematic structural view of a product obtained in example 1;
FIG. 2 is a schematic structural view of the product obtained in example 2;
wherein, A is a softness area corresponding to the legs, and B is a hardness area corresponding to the buttocks.
Detailed Description
The invention is further described below with reference to the drawings and examples in order to better understand the technical solution.
Example 1: preparation of double-hardness foam pad
1) Preparing raw materials: mixing 330N 48 parts of polyether polyol, H3012 parts of polymer polyol, 0.1 part of ammonia catalyst, 1 part of silicone oil pore-forming agent, 0.1 part of release agent and 0.5-2 parts of water, stirring for 4 hours at normal temperature to prepare a component A stirring material in a softness area, and then placing the component A stirring material in the softness area into a cavity at 24 ℃ and 13 MPa; putting 40 parts of raw material of component B, namely the isodiphenylmethane diisocyanate, into another chamber with the temperature of 22 ℃ and the pressure of 10MPa, respectively atomizing and spraying the component A stirred material and the component B raw material in a softness area under the high pressure, and fully mixing to form a softness area mixed solution;
mixing 330N 36 parts of polyether polyol, H3024 parts of polymer polyol, 0.1 part of ammonia catalyst, 1 part of silicone oil pore-forming agent, 0.1 part of release agent and 0.5-2 parts of water, stirring at normal temperature for 4 hours to prepare a stirring material of a component A in a hardness area, and then placing the stirring material of the component A in the hardness area into a cavity with the temperature of 24 ℃ and the pressure of 13 MPa; putting 40 parts of component B raw material diphenylmethane diisocyanate into another chamber with the temperature of 22 ℃ and the pressure of 10MPa, respectively atomizing and spraying the component A stirred material and the component B raw material in the hardness area under the high pressure, and fully mixing to form a hardness area mixed solution.
2) Preheating a mould: preheating a mould with a hardness zone cavity and a softness zone cavity to 45-60 ℃, spraying the softness zone mixed liquor into the softness zone cavity of the mould for 1.4s after preheating is finished, and spraying the hardness zone mixed liquor into the hardness zone cavity of the mould for 2.4 s.
3) Plasticizing, namely keeping the temperature of the mold constant within 45-60 ℃, closing the mold, and plasticizing and molding the mixed solution in the softness area cavity and the hardness area cavity under the high pressure generated by the mold for 3-5 min; wherein, be provided with the bead of a height 1cm between the hardness district chamber of mould and the softness district chamber and separate, the setting up of this bead makes soft, hard foam raw materials can effectively distinguish at the reaction initial stage, does not interfere each other to stride across the bead reaction at the reaction later stage, form good transition face.
4) And (3) plasticizing post-treatment: and (3) placing the product plasticized and formed in the step 3) at normal temperature and normal pressure for 12 hours to completely finish the plasticizing reaction, so as to prepare the double-hardness foam pad for wrapping the chair seat, wherein the structure of the double-hardness foam pad is shown in figure 1.
Performance testing
Test tool, sponge compression testing machine, oven, vernier caliper, electronic balance and ruler
And (3) resilience testing: the product obtained in example 1 was taken at 100 x 100mm, the thickness of the test piece was 50mm, the height of the falling ball was 500mm, and the average value of the rebound resilience was 45.3%.
Indentation hardness test: according to GB/T10807-2006 [ "determination of hardness of Soft foam Polymer materials (indentation method) ], the indentation hardness index of the compression method A, the indentation hardness characteristic of the method B and the indentation hardness test of the method C are used for testing, and data are recorded, and the results are shown in Table 1.
TABLE 1
And (3) testing the density: the actual density of the foam is calculated by p = m/v, and the actual density of the sample is 61.4kg/m3。
And (3) compression fatigue testing: according to GB/T18941-2003 "determination of constant load impact fatigue of porous elastic materials of high polymers", compression force value: 750N, number of compressions: 80000 times, the change in hardness of the foam before and after the test was recorded, and finally the percent reduction in hardness =6.2%, see table 2.
TABLE 2
75% compression permanent test: according to GB/T6669-2008 "determination of compression set of flexible foamed polymer material", 75% of the thickness of the compressed sample is held at a temperature of 70 ℃ for 22 hours, and the compression set CS =5.0% is calculated.
And (3) hardness testing: and (3) pressing hardness test, placing the sample on a firm plane, holding the hardness tester, and stably pressing a pressure foot on the sample by a pressure pin which is at least 12mm away from the edge of the sample so that the pressure pin is straightly pressed into the sample until the pressure foot is completely contacted with the sample, wherein the reading is carried out within 1 second. The obstruction values were measured 5 times at different positions with points at least 6mm apart and averaged (microporous material points at least 15mm apart) and the results are given in Table 3.
Table 3: sponge hardness data recording table
Example 2: preparation of double-hardness foam pad
1) Preparing raw materials: mixing 330N 54 parts of polyether polyol, H306 parts of polymer polyol, 0.1 part of ammonia catalyst, 1 part of silicone oil pore forming agent, 0.1 part of release agent and 0.5-2 parts of water, stirring for 4 hours at normal temperature to prepare a component A stirring material in a softness area, and then placing the component A stirring material in the softness area into a cavity with the temperature of 24 ℃ and the pressure of 13 MPa; putting 40 parts of component B raw material diphenylmethane diisocyanate into another chamber with the temperature of 22 ℃ and the pressure of 10MPa, respectively atomizing and spraying the component A stirring material and the component B raw material in the softness area under the high pressure, and fully mixing to form a softness area mixed solution;
mixing 40 parts of polyether polyol 330N, 0 part of polymer polyol H3020, 0.1 part of ammonia catalyst, 1 part of silicone oil pore-forming agent, 0.1 part of release agent and 0.5-2 parts of water, stirring at normal temperature for 4 hours to prepare a component A stirring material in a hardness area, and then placing the component A stirring material in the hardness area into a cavity with the temperature of 24 ℃ and the pressure of 13 MPa; putting 40 parts of component B raw material diphenylmethane diisocyanate into another chamber with the temperature of 22 ℃ and the pressure of 10MPa, respectively atomizing and spraying the component A stirred material and the component B raw material in the hardness area under the high pressure, and fully mixing to form a hardness area mixed solution.
2) Preheating a mould: preheating a mould with a hardness zone cavity and a softness zone cavity to 45-60 ℃, spraying the softness zone mixed liquor into the softness zone cavity of the mould for 1.4s after preheating is finished, and spraying the hardness zone mixed liquor into the hardness zone cavity of the mould for 2.4 s.
3) Plasticizing, namely keeping the temperature of the mold constant within 45-60 ℃, closing the mold, and plasticizing and molding the mixed solution in the softness area cavity and the hardness area cavity under the high pressure generated by the mold for 3-5 min; wherein, be provided with the bead of a height 1cm between the hardness district chamber of mould and the softness district chamber and separate, the setting up of this bead makes soft, hard foam raw materials can effectively distinguish at the reaction initial stage, does not interfere each other to stride across the bead reaction at the reaction later stage, form good transition face.
4) And (3) plasticizing post-treatment: and (3) placing the product plasticized and formed in the step 3) at normal temperature and normal pressure for 12 hours to completely finish the plasticizing reaction, so as to prepare the double-hardness foam pad for wrapping the chair seat, wherein the structure of the double-hardness foam pad is shown in figure 2.
Performance testing
Test tool, sponge compression testing machine, oven, vernier caliper, electronic balance and ruler
And (3) resilience testing: the product obtained in example 1 was taken at 100 x 100mm, the thickness of the test piece was 50mm, the ball drop height was 500mm, and the average rebound was 42.5%.
Indentation hardness test: according to GB/T10807-2006 [ "determination of hardness of Soft foam Polymer materials (indentation method) ], the indentation hardness index of the compression method A, the indentation hardness characteristic of the method B and the indentation hardness test of the method C are used for testing, and data are recorded, and the results are shown in Table 4.
TABLE 4
And (3) testing the density: the actual density of the foam is calculated by p = m/v, and the actual density of the sample is 60.4kg/m3。
And (3) compression fatigue testing: according to GB/T18941-2003 "determination of constant load impact fatigue of porous elastic materials of high polymers", compression force value: 750N, number of compressions: 80000 times, the change in hardness of the foam before and after the test was recorded, and the final percent hardness reduction was found to be =4.09%, see table 5.
TABLE 5
75% compression permanent test: according to GB/T6669-2008 "determination of compression set of flexible foamed polymer material", 75% of the thickness of the compressed sample is held at a temperature of 70 ℃ for 22 hours, and the compression set CS =5.0% is calculated.
And (3) hardness testing: and (3) pressing hardness test, placing the sample on a firm plane, holding the hardness tester, and stably pressing a pressure foot on the sample by a pressure pin which is at least 12mm away from the edge of the sample so that the pressure pin is straightly pressed into the sample until the pressure foot is completely contacted with the sample, wherein the reading is carried out within 1 second. The obstruction values were measured 5 times at different positions with points at least 6mm apart and averaged (microporous material points at least 15mm apart) and the results are given in Table 6.
Table 6: sponge hardness data recording table
Claims (7)
1. A double-hardness foam cotton pad is characterized in that: the foam pad is provided with a softness area and a hardness area, the softness area and the hardness area are both composed of two reaction raw materials of an A component and a B component,
the component A of the softness area foam cotton pad consists of the following raw materials in parts by weight: 44-54 parts of polyether polyol 330N, 306-16 parts of polymer polyol H, 0.1 part of catalyst, 1 part of pore-forming agent, 0.1 part of release agent and 0.5-2 parts of water, wherein the component B is 40 parts of diphenylmethane diisocyanate;
the component A of the foam pad in the hardness area consists of the following raw materials in parts by weight: 30-40 parts of polyether polyol 330N, 0-30 parts of polymer polyol H3020, 0.1 part of a catalyst, 1 part of a pore-forming agent, 0.1 part of a release agent, 0.5-2 parts of water, and 40 parts of diphenylmethane diisocyanate as a component B.
2. A dual firmness foam pad according to claim 1, wherein: the component A of the softness area foam cotton pad consists of the following raw materials in parts by weight: 48 parts of polyether polyol 330N, 0.1 part of catalyst, 1 part of pore-forming agent, 0.1 part of release agent, 0.5-2 parts of water and 40 parts of diphenylmethane diisocyanate as a component B;
the component A of the foam cotton pad in the hardness area consists of the following raw materials in parts by weight: the adhesive comprises, by weight, 330N 36 parts of polyether polyol, H3024 parts of polymer polyol, 0.1 part of a catalyst, 1 part of a pore-forming agent, 0.1 part of a mold release agent, 0.5-2 parts of water, and 40 parts of diphenylmethane diisocyanate as a component B.
3. A dual hardness foam pad according to any one of claims 1 to 2, wherein: the catalyst is an ammonia catalyst, and the pore-forming agent is a silicone oil pore-forming agent.
4. A preparation method of a double-hardness foam cotton pad is characterized by comprising the following steps: the preparation method comprises the following steps:
1) preparing raw materials: mixing the raw materials of the component A in the softness area according to the formula ratio, stirring for 3-5 hours at normal temperature to obtain a stirring material of the component A in the softness area, and then placing the stirring material of the component A in the softness area into a cavity with the temperature of 24 ℃ and the pressure of 13 MPa; placing the component B raw material into another chamber with the temperature of 22 ℃ and the pressure of 10MPa, atomizing and spraying the component A stirring material and the component B raw material in the softness area under the high pressure respectively, and fully mixing to form a softness area mixed solution;
mixing the raw materials of the component A in the hardness area according to the formula amount, stirring for 3-5 hours at normal temperature to prepare a component A stirring material in the hardness area, and then placing the component A stirring material in the hardness area into a cavity with the temperature of 24 ℃ and the pressure of 13 MPa; placing the raw material of the component B into another chamber with the temperature of 22 ℃ and the pressure of 10MPa, atomizing and spraying the mixed material of the component A and the raw material of the component B in the hardness area under the high pressure respectively, and fully mixing to form mixed liquid of the hardness area;
2) preheating a mould: preheating a mould with a hardness zone cavity and a softness zone cavity, spraying a softness zone mixed solution into the mould softness zone cavity after preheating is finished, and then spraying a hardness zone mixed solution into the mould hardness zone cavity;
3) plasticizing, namely keeping the mold within a preheating temperature range, closing the mold, and plasticizing and molding the mixed solution in the soft area cavity and the hard area cavity under high pressure generated by the mold;
4) and (3) plasticizing post-treatment: and (3) placing the product plasticized and formed in the step 3) for 12 hours at normal temperature and normal pressure to completely finish the plasticizing reaction to obtain the double-hardness foam pad.
5. The method of making a dual firmness foam pad of claim 4, wherein: and in the step 2), the mould is preheated to 45-60 ℃, the spraying time of the mixed liquid in the softness area is 1.4s, and the spraying time of the mixed liquid in the hardness area is 2.4 s.
6. The method of making a dual firmness foam pad of claim 4, wherein: and the plasticizing and forming time in the step 3) is 3-5 min.
7. The method of making a dual firmness foam pad of claim 4, wherein: and a convex edge with the height of 1cm is arranged between the hardness area cavity and the softness area cavity of the die for separation.
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| CN202110928725.7A CN113603851A (en) | 2021-08-13 | 2021-08-13 | Double-hardness foam pad and preparation method thereof |
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| CN202110928725.7A CN113603851A (en) | 2021-08-13 | 2021-08-13 | Double-hardness foam pad and preparation method thereof |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04220312A (en) * | 1990-12-21 | 1992-08-11 | Toyo Tire & Rubber Co Ltd | Molding method of different hardness cushion body |
| JPH06166042A (en) * | 1992-11-30 | 1994-06-14 | Toyo Tire & Rubber Co Ltd | Production of different-hardness polyurethane molded foam and device therefor |
| CN204278390U (en) * | 2014-11-24 | 2015-04-22 | 上海橡胶制品研究所 | A kind of mould of the breathing mask for the manufacture of different hardness silicon rubber compound |
| CN110156951A (en) * | 2019-06-06 | 2019-08-23 | 浙江圣奥家具制造有限公司 | A kind of different hardness shaping sponge cushion and preparation method thereof |
-
2021
- 2021-08-13 CN CN202110928725.7A patent/CN113603851A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04220312A (en) * | 1990-12-21 | 1992-08-11 | Toyo Tire & Rubber Co Ltd | Molding method of different hardness cushion body |
| JPH06166042A (en) * | 1992-11-30 | 1994-06-14 | Toyo Tire & Rubber Co Ltd | Production of different-hardness polyurethane molded foam and device therefor |
| CN204278390U (en) * | 2014-11-24 | 2015-04-22 | 上海橡胶制品研究所 | A kind of mould of the breathing mask for the manufacture of different hardness silicon rubber compound |
| CN110156951A (en) * | 2019-06-06 | 2019-08-23 | 浙江圣奥家具制造有限公司 | A kind of different hardness shaping sponge cushion and preparation method thereof |
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Application publication date: 20211105 |