CN109694510B - Environment-friendly runway pavement material and construction method - Google Patents
Environment-friendly runway pavement material and construction method Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L21/00—Compositions of unspecified rubbers
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
- C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
- C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2207/00—Properties characterising the ingredient of the composition
- C08L2207/20—Recycled plastic
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Abstract
The invention discloses an environment-friendly runway pavement material, which comprises A, B two components, wherein the weight part ratio of the component A to the component B is 5-20: 1; wherein, the component A comprises: 5-20% of methyl methacrylate, 1-8% of methacrylic acid, 5-20% of styrene-butadiene rubber, 10-30% of EPDM rubber particles, 1-8% of peroxide initiator, 0-6% of azo initiator, 0.1-2% of vulcanizing agent, 5-16% of mineral oil, 0-10% of silicon dioxide, 0-5% of color paste and the balance of waste tire rubber; the component B comprises: 5-35% of methyl methacrylate, 2-9% of methacrylic acid, 5-20% of styrene-butadiene rubber, 10-25% of EPDM rubber particles, 0-5% of azo initiator, 1-3% of ultraviolet stabilizer, 2-9% of N, N-dimethylaniline and the balance of waste tire rubber. The environment-friendly runway pavement material has the characteristics of ageing resistance, high temperature resistance, favorable weather resistance and the like.
Description
Technical Field
The invention relates to the technical field of road paving materials, in particular to a novel environment-friendly runway paving material.
Background
The plastic track is also named as all-weather track for track and field sports and consists of polyurethane prepolymer, mixed polyether, waste tyre rubber, EPDM rubber grain or PU grain, pigment, assistant and stuffing. The plastic track has the characteristics of good flatness, high compressive strength, proper hardness and elasticity and stable physical performance, is beneficial to the exertion of the speed and the technology of athletes, effectively improves the sports performance and reduces the tumble injury rate. The plastic track is made of materials such as polyurethane rubber, has certain elasticity and color, has certain ultraviolet resistance and aging resistance, and is the best all-weather outdoor sports ground floor material internationally recognized.
In 11 months of 2015, "poison track" events occur successively in multiple schools such as Anhui, Henan, Jiangsu, Shanghai and Shenzhen. The 'Xinhua viewpoint' reporter finds that the raw materials of a part of school plastic runways are suspected to be 'Sanwu' products, 139 times of standard exceeding of methylbenzene and dimethylbenzene can enter the campus through a regular bidding program, and campus projects have loopholes in the links of bidding, raw materials, construction, acceptance inspection and the like.
The traditional runway pavement material has the following problems:
1) the traditional material needs to be heated, cured and crosslinked when the plastic track is constructed, and due to poor uniformity of heating equipment, part of the plastic track has serious polymerized monomer residues and the problem of slow release of toxic and harmful volatile substances.
2) The traditional plastic track is mostly formed by adopting epoxy resin and polyurethane materials, if the track is ensured to have good elasticity, bubbles need to be controlled to be generated, so that the process control is difficult, and the plastic track which is directly heated and constructed by part of construction units is lack of elasticity.
3) The traditional material construction material is easy to age in outdoor environment, so that the effective service life of the pavement is short, and the pavement needs to be repeatedly maintained and repaired.
Disclosure of Invention
The invention aims to overcome the defects of high manufacturing cost, difficult construction and easy aging in the prior art and provide an environment-friendly runway pavement material.
In order to achieve the above purpose, the invention provides the following technical scheme:
an environment-friendly runway pavement material comprises A, B two components, wherein the weight part ratio of the component A to the component B is 5-20: 1.
Wherein the component A comprises the following components in percentage by weight: 5-20% of methyl methacrylate, 1-8% of methacrylic acid, 5-20% of styrene-butadiene rubber, 10-30% of EPDM rubber particles, 1-8% of peroxide initiator, 0-6% of azo initiator, 0.1-2% of vulcanizing agent, 5-16% of mineral oil, 0-10% of silicon dioxide, 0-5% of color paste and the balance of waste tire rubber.
The component B comprises the following components in percentage by weight: 5-35% of methyl methacrylate, 2-9% of methacrylic acid, 5-20% of styrene-butadiene rubber, 10-25% of EPDM rubber particles, 0-5% of azo initiator, 1-3% of ultraviolet stabilizer, 2-9% of N, N-dimethylaniline and the balance of waste tire rubber.
The environment-friendly runway pavement material provided by the invention adopts waste tire rubber as a main matrix elastic material, and is combined with a methacrylic acid cross-linked polymer to realize cross-linking polymerization reaction under the interaction of an oxidant and a reducing agent, so that various raw material components of a plastic runway are mutually cross-linked and combined to form a good comprehensive stable plastic runway main body structure. The paved rubber track has the advantages of excellent elasticity, good weather resistance, no maintenance and the like, and can still maintain excellent stability for a long time even under severe environmental conditions.
Further, the environment-friendly runway pavement material comprises A, B two components, wherein the component A comprises the following components in percentage by weight: 8-14% of methyl methacrylate, 2-6% of methacrylic acid, 8-14% of styrene-butadiene rubber, 10-20% of EPDM rubber particles, 2-6% of peroxide initiator, 1-4% of azo initiator, 0.1-1.3% of vulcanizing agent, 5-10% of mineral oil, 0-10% of silicon dioxide, 1-4% of color paste and the balance of waste tire rubber.
The component B comprises the following components in percentage by weight: 5-20% of methyl methacrylate, 2-5% of methacrylic acid, 5-13% of styrene-butadiene rubber, 10-16% of EPDM rubber particles, 1-5% of azo initiator, 1-2.5% of ultraviolet stabilizer, 3-6% of N, N-dimethylaniline and the balance of waste tire rubber.
The environment-friendly runway pavement material disclosed by the invention is subjected to redox reaction by using a peroxide initiator and an N, N-dimethylaniline reducing agent to excite an azo initiator to realize comprehensive cross-linking polymerization reaction, and the waste tire rubber, EPDM rubber particles, styrene butadiene rubber and the like are effectively cross-linked together in the reaction process. The good adhesive elastic particle plastic track is formed, the plastic track has good elasticity in sports, the mutual crosslinking reaction of various components is fully activated and initiated, the reaction is complete, and no toxic and harmful volatile components are released.
Through national environmental protection monitoring, all indexes all meet the environmental protection requirement, can effectively avoid the improper result that construction condition, construction environment's difference lead to, avoid poisonous harmful volatile substance to release, protect middle and primary school student's health state.
Further, the weight ratio of the component A to the component B is 5-16: 1. The component A is used as a main component, the component B is used as an auxiliary component, and the oxidizing agent and the reducing agent in the component AB are used for carrying out redox reaction to initiate polymerization reaction of the paving material, so that good quality of the plastic track is realized. Preferably 7-12: 1.
Further, the mineral oil is paraffin oil.
Further, the EPDM is an ethylene propylene diene monomer rubber, which is a terpolymer of ethylene, propylene, and a non-conjugated diene.
Further, the peroxidation initiator is one or a mixture of two of inorganic peroxide and organic peroxide.
Preferably, the inorganic peroxide is a persulfate; the organic peroxide is one or a composition of more of diacyl peroxides, peroxyesters and dialkyl peroxides.
Preferably, the peroxidation initiator is a Benzoyl Peroxide (BPO).
Further, the azo initiator is one or a combination of azodiisobutyronitrile, azodiisoheptonitrile and azoisobutyronitrile formamide.
Preferably, the azoamidine initiator is one or a combination of azodiisobutyronitrile, azodiisoheptanonitrile, azobis (cyclomethane-carbonitrile) and azoisobutyryl cyano formamide.
Further, the ultraviolet stabilizer is a benzotriazole-based ultraviolet stabilizer and a hindered amine-based light stabilizer.
Further, the waste tire rubber is a waste tire rubber crushed into particles. The particle size is preferably 1 to 3 mm. The waste tire rubber particles have longer viscoelastic molecular chains, have good viscosity when being prepared into the component A, and keep the component A stable and not layered before use.
Further, the rubber content of the waste tire is more than or equal to 30 percent. The waste tire rubber forms the main elastic matrix of the plastic track, has important significance on the comprehensive weather resistance of the plastic track, ensures that the consumption of the waste tire rubber can control the cost and can improve the performance of the track. Preferably, the rubber content of the waste tire is more than or equal to 40 percent.
The invention also aims to provide the construction method of the environment-friendly runway pavement material, so that pavement construction of a runway is better realized, and the environment-friendly performance is ensured to meet the standard requirement.
The construction method of the environment-friendly runway pavement material comprises the following steps:
(1) and mixing the component A and the component B, and stirring for 10-120min to obtain the slurry to be paved.
(2) Pouring the slurry to be paved into a plastic track mould, and naturally curing; and (3) if the temperature is lower than 10 ℃, stirring and mixing the materials in the step (1) for not less than 30min, and if the temperature exceeds 25 ℃, stirring for not more than 60 min.
The time for stirring and mixing the environment-friendly runway pavement material is controlled, so that the pavement material is subjected to a polymerization reaction in advance to reach a proper degree, and then the pavement material can be subjected to a curing reaction after being paved and guided into a mold, so that monomer residues are avoided, and the comprehensive quality of the plastic runway is improved.
Further, preferably, in step 1, the stirring time is 20-90 min.
Compared with the prior art, the invention has the beneficial effects that:
1. the novel environment-friendly runway pavement material provided by the invention is initiated by introducing EPDM and modified polymethacrylic acid polymer materials through redox reaction, and the environment-friendly runway pavement material is subjected to full crosslinking reaction, has little monomer residue, is free of heavy metal components, and is environment-friendly and efficient.
2. The mechanism of the cross-linking polymerization reaction initiated by the environment-friendly runway pavement material is different from that of the traditional heating process, so that the dependence on the external heating polymerization reaction can be reduced, and the quality of the paved plastic runway is more guaranteed. The plastic track has better comprehensive performances of elasticity, toughness and the like.
Detailed Description
The present invention will be described in further detail with reference to test examples and specific embodiments. It should be understood that the scope of the above-described subject matter is not limited to the following examples, and any techniques implemented based on the disclosure of the present invention are within the scope of the present invention.
< example 1>
The environment-friendly runway pavement material comprises A, B two components, wherein the weight ratio of the A, B two components is 5-20: 1. Wherein the component A comprises the following components in percentage by weight: 13% of methyl methacrylate, 2% of methacrylic acid, 4% of styrene-butadiene rubber, 12% of EPDM rubber particles, 7% of benzoyl peroxide, 4% of azodiisobutyronitrile initiator, 1.3% of vulcanizing agent, 2% of mineral oil, 5% of silicon dioxide, 19% of color paste and the balance of waste tire rubber.
The component B comprises the following components in percentage by weight: 15% of methyl methacrylate, 2% of methacrylic acid, 7% of styrene-butadiene rubber, 22% of EPDM rubber particles, 4% of azobisisobutyronitrile initiator, 2.1% of benzotriazole ultraviolet stabilizer, 4% of N, N-dimethylaniline and the balance of waste tire rubber.
< example 2>
The environment-friendly runway pavement material comprises A, B two components, wherein the weight ratio of the A, B two components is 5-20: 1. Wherein the component A comprises the following components in percentage by weight: 18% of methyl methacrylate, 5% of methacrylic acid, 8% of styrene-butadiene rubber, 13% of EPDM rubber particles, 3% of benzoyl peroxide, 0% of azodiisobutyronitrile initiator, 0.3% of vulcanizing agent, 15% of mineral oil, 4% of silicon dioxide, 2% of color paste and the balance of waste tire rubber.
The component B comprises the following components in percentage by weight: 24% of methyl methacrylate, 2% of methacrylic acid, 6% of styrene-butadiene rubber, 24% of EPDM rubber particles, 2% of azodiisobutyronitrile initiator, 1.9% of benzotriazole ultraviolet stabilizer, 7% of N, N-dimethylaniline and the balance of waste tire rubber.
< example 3>
The environment-friendly runway pavement material comprises A, B two components, wherein the weight ratio of the A, B two components is 5-20: 1. Wherein the component A comprises the following components in percentage by weight: 15% of methyl methacrylate, 7% of methacrylic acid, 6% of styrene-butadiene rubber, 15% of EPDM rubber particles, 3% of benzoyl peroxide, 1% of azodiisoheptonitrile initiator, 0.8% of vulcanizing agent, 2% of mineral oil, 5% of silicon dioxide, 9% of color paste and the balance of waste tire rubber.
The component B comprises the following components in percentage by weight: 12% of methyl methacrylate, 8% of methacrylic acid, 18% of styrene-butadiene rubber, 11% of EPDM rubber particles, 4% of azodiisoheptanonitrile initiator, 2.1% of hindered amine ultraviolet stabilizer, 6% of N, N-dimethylaniline and the balance of waste tire rubber.
< example 4>
The environment-friendly runway pavement material comprises A, B two components, wherein the weight ratio of the A, B two components is 5-20: 1. Wherein the component A comprises the following components in percentage by weight: 13% of methyl methacrylate, 2% of methacrylic acid, 2% of styrene-butadiene rubber, 10% of EPDM rubber particles, 2% of benzoyl peroxide initiator, 1% of azobisisobutyronitrile initiator, 1.1% of vulcanizing agent, 6% of mineral oil, 10% of silicon dioxide, 14% of color paste and the balance of waste tire rubber.
The component B comprises the following components in percentage by weight: 17% of methyl methacrylate, 3% of methacrylic acid, 9% of styrene-butadiene rubber, 20% of EPDM rubber particles, 3% of azodiisoheptonitrile initiator, 1.4% of ultraviolet stabilizer, 5% of N, N-dimethylaniline and the balance of waste tire rubber.
< example 5>
The environment-friendly runway pavement material comprises A, B two components, wherein the weight ratio of the A, B two components is 5-20: 1. Wherein the component A comprises the following components in percentage by weight: 19% of methyl methacrylate, 2% of methacrylic acid, 8% of styrene-butadiene rubber, 5% of EPDM rubber particles, 4% of benzoyl peroxide, 0% of azodiisoheptanonitrile initiator, 0.6% of vulcanizing agent, 12% of mineral oil, 2% of silicon dioxide, 6% of color paste and the balance of waste tire rubber.
The component B comprises the following components in percentage by weight: 24% of methyl methacrylate, 3% of methacrylic acid, 12% of styrene-butadiene rubber, 10% of EPDM rubber particles, 2% of azobisisobutyronitrile initiator, 1% of ultraviolet stabilizer, 4% of N, N-dimethylaniline and the balance of waste tire rubber.
< comparative example 1>
The same track pavement material as in example 5 was used except that the EPDM rubber particles were not used.
< comparative example 2>
The same track pavement as in example 5 was used except that benzoyl peroxide was not used for component A and N, N-dimethylaniline was not used for component B. And paving in a heating mode in the construction process.
< test 1>
The runway pavement materials of the embodiment 5 and the comparative examples 1-2 are paved, firstly, the component A and the component B are mixed and stirred for 30min, and slurry to be paved is obtained. Then pouring the slurry into a plastic track mould at the temperature of 22 ℃, and naturally curing for 3 days. And testing the deformation rate, the impact absorption rate of the plastic track and the total volatile organic compounds according to a national standard method. Testing according to GB 36246 and 2018.
TABLE 1 environmental protection safety Performance test results
Total volatile organic compounds, benzene residue detection unit (mg/(m)3·h)。
The results show that the paving material without using EPDM has poor elasticity, high impact absorption rate and increased volatile organic compounds. In contrast, the comparative example 2 adopts a heating and curing method to initiate crosslinking polymerization, the initiation is insufficient, and heating is accompanied with a large amount of decomposition reaction, so that the detection level of the total volatile organic compounds is greatly increased, and the environmental protection level of the plastic track is influenced.
< example 6>
The environment-friendly runway pavement material comprises A, B two components, wherein the weight ratio of the A, B two components is 5-20: 1. Wherein the component A comprises the following components in percentage by weight: 14% of methyl methacrylate, 3% of methacrylic acid, 7% of styrene-butadiene rubber, 18% of EPDM rubber particles, 2% of benzoyl peroxide, 1% of azodiisobutyronitrile initiator, 1.4% of vulcanizing agent, 13% of mineral oil, 10% of silicon dioxide, 3% of color paste and the balance of waste tire rubber.
The component B comprises the following components in percentage by weight: 20% of methyl methacrylate, 2% of methacrylic acid, 17% of styrene-butadiene rubber, 15% of EPDM rubber particles, 5% of azodiisoheptonitrile initiator, 1.9% of ultraviolet stabilizer, 4% of N, N-dimethylaniline and the balance of waste tire rubber.
< comparative example 3>
The same track pavement as in example 6 was used except that the peroxysulphate was used instead of benzoyl peroxide. The test was carried out according to the same national standard method as described in test 1, with the following results: deformation rate of 0.6mm, tensile strength of 0.8MPa, tensile impact absorption rate of 51 percent and total volatile organic compounds of 1.8 mg/(m)3H). Peroxysulphate as initiator is slightly less efficient, the strength level of the plastic track is poorer and the release rate of volatile organic compounds is increased.
< example 7>
The environment-friendly runway pavement material comprises A, B two components, wherein the weight ratio of the A, B two components is 5-20: 1. Wherein the component A comprises the following components in percentage by weight: 19% of methyl methacrylate, 1% of methacrylic acid, 6% of styrene-butadiene rubber, 14% of EPDM rubber particles, 3% of benzoyl peroxide, 4% of azodiisobutyronitrile initiator, 0.2% of vulcanizing agent, 4% of mineral oil, 2% of silicon dioxide, 8% of color paste and the balance of waste tire rubber.
The component B comprises the following components in percentage by weight: 20% of methyl methacrylate, 9% of methacrylic acid, 17% of styrene-butadiene rubber, 14% of EPDM rubber particles, 1% of azobisisobutyronitrile initiator, 1.1% of ultraviolet stabilizer, 2% of N, N-dimethylaniline and the balance of waste tire rubber.
The construction method of the environment-friendly runway pavement material comprises the following steps: and mixing the component A and the component B, and stirring for 60min to obtain the slurry to be paved. And pouring the slurry into a plastic track mold at the temperature of 22 ℃, and naturally curing for three days.
< example 8>
The environment-friendly runway pavement material comprises A, B two components, wherein the weight ratio of the A, B two components is 5-20: 1. Wherein the component A comprises the following components in percentage by weight: 16% of methyl methacrylate, 5% of methacrylic acid, 5% of styrene-butadiene rubber, 5% of EPDM rubber particles, 3% of benzoyl peroxide, 3% of azodiisobutyronitrile initiator, 1.3% of vulcanizing agent, 11% of mineral oil, 0% of silicon dioxide, 17% of color paste and the balance of waste tire rubber.
The component B comprises the following components in percentage by weight: 10% of methyl methacrylate, 2% of methacrylic acid, 11% of styrene-butadiene rubber, 15% of EPDM rubber particles, 2% of azobisisobutyronitrile initiator, 1% of ultraviolet stabilizer, 4% of N, N-dimethylaniline and the balance of waste tire rubber.
The construction method of the environment-friendly runway pavement material comprises the following steps: and mixing the component A and the component B, and stirring for 30min to obtain the slurry to be paved. And pouring the slurry into a plastic track mold at the temperature of 22 ℃, and naturally curing for 3 days.
Claims (8)
1. An environment-friendly runway pavement material comprises A, B two components, wherein the weight part ratio of the component A to the component B is 5-20: 1;
wherein the component A comprises the following components in percentage by weight: 5-20% of methyl methacrylate, 1-8% of methacrylic acid, 5-20% of styrene-butadiene rubber, 10-30% of EPDM rubber particles, 1-8% of peroxide initiator, 0-6% of azo initiator, 0.1-2% of vulcanizing agent, 5-16% of mineral oil, 0-10% of silicon dioxide, 0-5% of color paste and the balance of waste tire rubber;
the component B comprises the following components in percentage by weight: 5-35% of methyl methacrylate, 2-9% of methacrylic acid, 5-20% of styrene-butadiene rubber, 10-25% of EPDM rubber particles, 1-5% of azo initiator, 1-3% of ultraviolet stabilizer, 2-9% of N, N-dimethylaniline and the balance of waste tire rubber;
the peroxide initiator is one or a mixture of two of inorganic peroxide and organic peroxide.
2. The environment-friendly runway pavement material of claim 1, wherein the component A comprises the following components in percentage by weight: 8-14% of methyl methacrylate, 2-6% of methacrylic acid, 8-14% of styrene-butadiene rubber, 10-20% of EPDM rubber particles, 2-6% of peroxide initiator, 1-4% of azo initiator, 0.1-1.3% of vulcanizing agent, 5-10% of mineral oil, 0-10% of silicon dioxide, 1-4% of color paste and the balance of waste tire rubber.
3. The environment-friendly runway pavement material of claim 1, wherein the component B comprises the following components in percentage by weight: 5-20% of methyl methacrylate, 2-5% of methacrylic acid, 5-13% of styrene-butadiene rubber, 10-16% of EPDM rubber particles, 1-5% of azo initiator, 1-2.5% of ultraviolet stabilizer, 3-6% of N, N-dimethylaniline and the balance of waste tire rubber.
4. The environment-friendly runway pavement material of claim 1, wherein the weight ratio of the component A to the component B is 5-16: 1.
5. The environment-friendly runway pavement of claim 1, wherein the mineral oil is paraffin oil.
6. An environment friendly track pavement as defined in claim 1, wherein said EPDM is ethylene propylene diene monomer rubber, a terpolymer of ethylene, propylene and a non-conjugated diene.
7. The environment-friendly runway pavement of claim 1, wherein the azo initiator is one or a combination of azodiisobutyronitrile, azodiisoheptanonitrile and azoisobutyrylcyanamide.
8. A method for constructing an environment-friendly runway pavement according to any one of claims 1-7, comprising the following steps:
(1) mixing the component A and the component B, and stirring for 10-120min to obtain slurry to be paved;
(2) pouring the slurry to be paved into a plastic track mould, and naturally curing; and (3) if the temperature is lower than 10 ℃, stirring and mixing the materials in the step (1) for not less than 30min, and if the temperature exceeds 25 ℃, stirring for not more than 60 min.
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| CN112980101A (en) * | 2021-03-25 | 2021-06-18 | 南通市扬子橡塑有限公司 | Micro-foaming polyurethane rubber track and preparation method thereof |
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| CN104628932A (en) * | 2015-02-03 | 2015-05-20 | 江西岳峰高分子材料有限公司 | Initiation system for producing acrylic polymer and application method of initiation system |
| CN106632742A (en) * | 2016-12-30 | 2017-05-10 | 长沙加美乐素化工有限公司 | Composite activator system and method for preparing concrete water-reducing admixture from same |
| CN109082973A (en) * | 2018-09-18 | 2018-12-25 | 潘桢 | A kind of curly wire lawn plastic cement race track production method |
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| CN101497727A (en) * | 2009-03-04 | 2009-08-05 | 南亚塑胶工业股份有限公司 | PVC resin composition and product thereof |
| CN104628932A (en) * | 2015-02-03 | 2015-05-20 | 江西岳峰高分子材料有限公司 | Initiation system for producing acrylic polymer and application method of initiation system |
| CN106632742A (en) * | 2016-12-30 | 2017-05-10 | 长沙加美乐素化工有限公司 | Composite activator system and method for preparing concrete water-reducing admixture from same |
| CN109082973A (en) * | 2018-09-18 | 2018-12-25 | 潘桢 | A kind of curly wire lawn plastic cement race track production method |
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